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  1. Book ; Online: Environment-friendly gas mixtures for Resistive Plate Chambers

    Bianchi, A. / Delsanto, S. / Dupieux, P. / Ferretti, A. / Gagliardi, M. / Joly, B. / Manen, S. P. / Marchisone, M. / Micheletti, L. / Quaglia, L. / Rosano, A. / Terlizzi, L. / Vercellin, E.

    an experimental and simulation study

    2020  

    Abstract: Resistive Plate Chambers (RPC) have shown stable operation at the Large Hadron Collider and satisfactory efficiency for the entire Run 1 (2010-2013) and Run 2 (2015-2018) with C$_{2}$H$_{2}$F$_{4}$-based gas mixtures and the addition of SF$_{6}$ and i-C$ ... ...

    Abstract Resistive Plate Chambers (RPC) have shown stable operation at the Large Hadron Collider and satisfactory efficiency for the entire Run 1 (2010-2013) and Run 2 (2015-2018) with C$_{2}$H$_{2}$F$_{4}$-based gas mixtures and the addition of SF$_{6}$ and i-C$_{4}$H$_{10}$. Since its global warming potential (GWP) is high, C$_{2}$H$_{2}$F$_{4}$ is phasing out of production due to recent European Union regulations and as a result its cost is progressively increasing. Therefore, finding a new RPC gas mixture with a low GWP has become extremely important. This contribution describes the simulation of the RPC efficiency with tetrafluoropropene C$_{3}$H$_{2}$F$_{4}$ (HFO1234ze), a hydrofluoroolefin with very low GWP. Simulation results are systematically compared with measurements of RPC efficiency in C$_{3}$H$_{2}$F$_{4}$-based gas mixtures with the addition of different combinations of Ar, He, CO$_{2}$, O$_{2}$ and i-C$_{4}$H$_{10}$ in various concentrations. This simulation allows the study of the interplay between C$_{3}$H$_{2}$F$_{4}$ and the other gas components in the mixture as well as may allow the identification of the most promising environment-friendly gas mixtures with C$_{3}$H$_{2}$F$_{4}$ for RPCs.

    Comment: 15th Workshop on Resistive Plate Chambers and Related Detectors (RPC 2020)
    Keywords Physics - Instrumentation and Detectors
    Subject code 621
    Publishing date 2020-05-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Online: Studies on tetrafluoropropene-based gas mixtures with low environmental impact for Resistive Plate Chambers

    Bianchi, A. / Delsanto, S. / Dupieux, P. / Ferretti, A. / Gagliardi, M. / Joly, B. / Manen, S. P. / Marchisone, M. / Micheletti, L. / Rosano, A. / Vercellin, E.

    2020  

    Abstract: Gaseous detectors are widely used in high-energy physics experiments, and in particular at the CERN Large Hadron Collider (LHC), to provide tracking and triggering over large volumes. It has been recently estimated that Resistive Plate Chambers (RPC), ... ...

    Abstract Gaseous detectors are widely used in high-energy physics experiments, and in particular at the CERN Large Hadron Collider (LHC), to provide tracking and triggering over large volumes. It has been recently estimated that Resistive Plate Chambers (RPC), used for muon detection, have the highest contribution on the overall greenhouse gas (GHG) emissions at the LHC experiments. Gas mixtures for RPCs are mainly made of C$_{2}$H$_{2}$F$_{4}$, which is a greenhouse gas with a high environmental impact in the atmosphere. C$_{2}$H$_{2}$F$_{4}$ is already phasing out of production, due to recent European Union (EU) regulations, and its cost is expected to increase in the near future. Therefore, finding alternative gas mixtures made of gas components with a low Global Warming Potential (GWP) has become extremely important for limiting the GHG emissions as well as for economic reasons. The novel hydrofluoroolefins are likely appropriate candidates to replace C$_{2}$H$_{2}$F$_{4}$ due to their similar chemical structures. This study is focused on the characterization of innovative gas mixtures with tetrafluoropropene HFO1234ze(E) (C$_{3}$H$_{2}$F$_{4}$) that is one of the most eco-friendly hydrofluoroolefins, thanks to its very low GWP. HFO1234ze(E)-based gas mixtures with the addition of Ar, N$_{2}$, O$_{2}$ and CO$_{2}$ are extensively discussed in this paper as well as the role of i-C$_{4}$H$_{10}$ and SF$_{6}$ in such mixtures.

    Comment: 15th Topical Seminar on Innovative Particle and Radiation Detectors (IPRD19)
    Keywords Physics - Instrumentation and Detectors
    Subject code 621
    Publishing date 2020-01-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: Characterization of tetrafluoropropene-based gas mixtures for the Resistive Plate Chambers of the ALICE muon spectrometer

    Bianchi, A. / Delsanto, S. / Dupieux, P. / Ferretti, A. / Gagliardi, M. / Joly, B. / Manen, S. P. / Marchisone, M. / Micheletti, L. / Rosano, A. / Vercellin, E.

    2019  

    Abstract: The muon identification system of the ALICE experiment at the CERN LHC is based on Resistive Plate Chamber (RPC) detectors. These RPCs are operated in the so-called maxi-avalanche mode with a gas mixture made of tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), ...

    Abstract The muon identification system of the ALICE experiment at the CERN LHC is based on Resistive Plate Chamber (RPC) detectors. These RPCs are operated in the so-called maxi-avalanche mode with a gas mixture made of tetrafluoroethane (C$_{2}$H$_{2}$F$_{4}$), sulfur hexafluoride (SF$_{6}$) and isobutane (i-C$_{4}$H$_{10}$). All of these components are greenhouse gases: in particular, the first two gases are already phasing out of production, due to recent European Union regulations, and their cost is progressively increasing. Therefore, finding a new eco-friendly gas mixture has become extremely important in order to reduce the impact of the RPC operation on the environment, and for economic reasons. Due to the similar chemical structure, hydrofluoroolefins appear appropriate candidates to replace C$_{2}$H$_{2}$F$_{4}$ thanks to their very low GWPs, especially tetrafluoropropene (C$_{3}$H$_{2}$F$_{4}$) with the trade name HFO1234ze. In order to identify an eco-friendly gas mixture fulfilling the requirements for operation in the ALICE environment in the coming years, a dedicated experimental set-up has been built to carry out R&D studies on promising gas mixtures. Measurements have been performed with a small-size RPC equipped with the front-end electronics, providing signal amplification, developed for ALICE operation at high luminosity after the LHC Long Shutdown 2. HFO1234ze-based mixtures with the addition of CO$_{2}$ are discussed in this paper as well as the role of i-C$_{4}$H$_{10}$ and SF$_{6}$ as quenchers in such mixtures.
    Keywords Physics - Instrumentation and Detectors ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2019-07-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Elliptic Flow of Electrons from Beauty-Hadron Decays in Pb-Pb Collisions at sqrt[s_{NN}]=5.02  TeV.

    Acharya, S / Adamová, D / Adler, A / Adolfsson, J / Aggarwal, M M / Aglieri Rinella, G / Agnello, M / Agrawal, N / Ahammed, Z / Ahmad, S / Ahn, S U / Akbar, Z / Akindinov, A / Al-Turany, M / Alam, S N / Albuquerque, D S D / Aleksandrov, D / Alessandro, B / Alfanda, H M /
    Alfaro Molina, R / Ali, B / Ali, Y / Alici, A / Alizadehvandchali, N / Alkin, A / Alme, J / Alt, T / Altenkamper, L / Altsybeev, I / Anaam, M N / Andrei, C / Andreou, D / Andronic, A / Angeletti, M / Anguelov, V / Anson, C / Antičić, T / Antinori, F / Antonioli, P / Apadula, N / Aphecetche, L / Appelshäuser, H / Arcelli, S / Arnaldi, R / Arratia, M / Arsene, I C / Arslandok, M / Augustinus, A / Averbeck, R / Aziz, S / Azmi, M D / Badalà, A / Baek, Y W / Bagnasco, S / Bai, X / Bailhache, R / Bala, R / Balbino, A / Baldisseri, A / Ball, M / Balouza, S / Banerjee, D / Barbera, R / Barioglio, L / Barnaföldi, G G / Barnby, L S / Barret, V / Bartalini, P / Bartels, C / Barth, K / Bartsch, E / Baruffaldi, F / Bastid, N / Basu, S / Batigne, G / Batyunya, B / Bauri, D / Bazo Alba, J L / Bearden, I G / Beattie, C / Bedda, C / Behera, N K / Belikov, I / Bell Hechavarria, A D C / Bellini, F / Bellwied, R / Belyaev, V / Bencedi, G / Beole, S / Bercuci, A / Berdnikov, Y / Berenyi, D / Bertens, R A / Berzano, D / Besoiu, M G / Betev, L / Bhasin, A / Bhat, I R / Bhat, M A / Bhatt, H / Bhattacharjee, B / Bianchi, A / Bianchi, L / Bianchi, N / Bielčík, J / Bielčíková, J / Bilandzic, A / Biro, G / Biswas, R / Biswas, S / Blair, J T / Blau, D / Blume, C / Boca, G / Bock, F / Bogdanov, A / Boi, S / Bok, J / Boldizsár, L / Bolozdynya, A / Bombara, M / Bonomi, G / Borel, H / Borissov, A / Bossi, H / Botta, E / Bratrud, L / Braun-Munzinger, P / Bregant, M / Broz, M / Bruna, E / Bruno, G E / Buckland, M D / Budnikov, D / Buesching, H / Bufalino, S / Bugnon, O / Buhler, P / Buncic, P / Buthelezi, Z / Butt, J B / Bysiak, S A / Caffarri, D / Caliva, A / Calvo Villar, E / Camacho, J M M / Camacho, R S / Camerini, P / Canedo, F D M / Capon, A A / Carnesecchi, F / Caron, R / Castillo Castellanos, J / Castro, A J / Casula, E A R / Catalano, F / Ceballos Sanchez, C / Chakraborty, P / Chandra, S / Chang, W / Chapeland, S / Chartier, M / Chattopadhyay, S / Chauvin, A / Cheshkov, C / Cheynis, B / Chibante Barroso, V / Chinellato, D D / Cho, S / Chochula, P / Chowdhury, T / Christakoglou, P / Christensen, C H / Christiansen, P / Chujo, T / Cicalo, C / Cifarelli, L / Cilladi, L D / Cindolo, F / Ciupek, M R / Clai, G / Cleymans, J / Colamaria, F / Colella, D / Collu, A / Colocci, M / Concas, M / Conesa Balbastre, G / Conesa Del Valle, Z / Contin, G / Contreras, J G / Cormier, T M / Corrales Morales, Y / Cortese, P / Cosentino, M R / Costa, F / Costanza, S / Crochet, P / Cuautle, E / Cui, P / Cunqueiro, L / Dabrowski, D / Dahms, T / Dainese, A / Damas, F P A / Danisch, M C / Danu, A / Das, D / Das, I / Das, P / Das, S / Dash, A / Dash, S / De, S / De Caro, A / de Cataldo, G / de Cuveland, J / De Falco, A / De Gruttola, D / De Marco, N / De Pasquale, S / Deb, S / Degenhardt, H F / Deja, K R / Deloff, A / Delsanto, S / Deng, W / Dhankher, P / Di Bari, D / Di Mauro, A / Diaz, R A / Dietel, T / Dillenseger, P / Ding, Y / Divià, R / Dixit, D U / Djuvsland, Ø / Dmitrieva, U / Dobrin, A / Dönigus, B / Dordic, O / Dubey, A K / Dubla, A / Dudi, S / Dukhishyam, M / Dupieux, P / Ehlers, R J / Eikeland, V N / Elia, D / Erazmus, B / Erhardt, F / Erokhin, A / Ersdal, M R / Espagnon, B / Eulisse, G / Evans, D / Evdokimov, S / Fabbietti, L / Faggin, M / Faivre, J / Fan, F / Fantoni, A / Fasel, M / Fecchio, P / Feliciello, A / Feofilov, G / Fernández Téllez, A / Ferrero, A / Ferretti, A / Festanti, A / Feuillard, V J G / Figiel, J / Filchagin, S / Finogeev, D / Fionda, F M / Fiorenza, G / Flor, F / Flores, A N / Foertsch, S / Foka, P / Fokin, S / Fragiacomo, E / Frankenfeld, U / Fuchs, U / Furget, C / Furs, A / Fusco Girard, M / Gaardhøje, J J / Gagliardi, M / Gago, A M / Gal, A / Galvan, C D / Ganoti, P / Garabatos, C / Garcia, J R A / Garcia-Solis, E / Garg, K / Gargiulo, C / Garibli, A / Garner, K / Gasik, P / Gauger, E F / Gay Ducati, M B / Germain, M / Ghosh, J / Ghosh, P / Ghosh, S K / Giacalone, M / Gianotti, P / Giubellino, P / Giubilato, P / Glaenzer, A M C / Glässel, P / Gomez Ramirez, A / Gonzalez, V / González-Trueba, L H / Gorbunov, S / Görlich, L / Goswami, A / Gotovac, S / Grabski, V / Graczykowski, L K / Graham, K L / Greiner, L / Grelli, A / Grigoras, C / Grigoriev, V / Grigoryan, A / Grigoryan, S / Groettvik, O S / Grosa, F / Grosse-Oetringhaus, J F / Grosso, R / Guernane, R / Guittiere, M / Gulbrandsen, K / Gunji, T / Gupta, A / Gupta, R / Guzman, I B / Haake, R / Habib, M K / Hadjidakis, C / Hamagaki, H / Hamar, G / Hamid, M / Hannigan, R / Haque, M R / Harlenderova, A / Harris, J W / Harton, A / Hasenbichler, J A / Hassan, H / Hassan, Q U / Hatzifotiadou, D / Hauer, P / Havener, L B / Hayashi, S / Heckel, S T / Hellbär, E / Helstrup, H / Herghelegiu, A / Herman, T / Hernandez, E G / Herrera Corral, G / Herrmann, F / Hetland, K F / Hillemanns, H / Hills, C / Hippolyte, B / Hohlweger, B / Honermann, J / Horak, D / Hornung, A / Hornung, S / Hosokawa, R / Hristov, P / Huang, C / Hughes, C / Huhn, P / Humanic, T J / Hushnud, H / Husova, L A / Hussain, N / Hussain, S A / Hutter, D / Iddon, J P / Ilkaev, R / Ilyas, H / Inaba, M / Innocenti, G M / Ippolitov, M / Isakov, A / Islam, M S / Ivanov, M / Ivanov, V / Izucheev, V / Jacak, B / Jacazio, N / Jacobs, P M / Jadlovska, S / Jadlovsky, J / Jaelani, S / Jahnke, C / Jakubowska, M J / Janik, M A / Janson, T / Jercic, M / Jevons, O / Jin, M / Jonas, F / Jones, P G / Jung, J / Jung, M / Jusko, A / Kalinak, P / Kalweit, A / Kaplin, V / Kar, S / Karasu Uysal, A / Karatovic, D / Karavichev, O / Karavicheva, T / Karczmarczyk, P / Karpechev, E / Kazantsev, A / Kebschull, U / Keidel, R / Keil, M / Ketzer, B / Khabanova, Z / Khan, A M / Khan, S / Khanzadeev, A / Kharlov, Y / Khatun, A / Khuntia, A / Kileng, B / Kim, B / Kim, D / Kim, D J / Kim, E J / Kim, H / Kim, J / Kim, J S / Kim, M / Kim, S / Kim, T / Kirsch, S / Kisel, I / Kiselev, S / Kisiel, A / Klay, J L / Klein, C / Klein, J / Klein, S / Klein-Bösing, C / Kleiner, M / Kluge, A / Knichel, M L / Knospe, A G / Kobdaj, C / Köhler, M K / Kollegger, T / Kondratyev, A / Kondratyeva, N / Kondratyuk, E / Konig, J / Konigstorfer, S A / Konopka, P J / Kornakov, G / Koska, L / Kovalenko, O / Kovalenko, V / Kowalski, M / Králik, I / Kravčáková, A / Kreis, L / Krivda, M / Krizek, F / Krizkova Gajdosova, K / Krüger, M / Kryshen, E / Krzewicki, M / Kubera, A M / Kučera, V / Kuhn, C / Kuijer, P G / Kumar, L / Kundu, S / Kurashvili, P / Kurepin, A / Kurepin, A B / Kuryakin, A / Kushpil, S / Kvapil, J / Kweon, M J / Kwon, J Y / Kwon, Y / La Pointe, S L / La Rocca, P / Lai, Y S / Lamanna, M / Langoy, R / Lapidus, K / Lardeux, A / Larionov, P / Laudi, E / Lavicka, R / Lazareva, T / Lea, R / Leardini, L / Lee, J / Lee, S / Lehner, S / Lehrbach, J / Lemmon, R C / León Monzón, I / Lesser, E D / Lettrich, M / Lévai, P / Li, X / Li, X L / Lien, J / Lietava, R / Lim, B / Lindenstruth, V / Lindner, A / Lippmann, C / Lisa, M A / Liu, A / Liu, J / Liu, S / Llope, W J / Lofnes, I M / Loginov, V / Loizides, C / Loncar, P / Lopez, J A / Lopez, X / López Torres, E / Luhder, J R / Lunardon, M / Luparello, G / Ma, Y G / Maevskaya, A / Mager, M / Mahmood, S M / Mahmoud, T / Maire, A / Majka, R D / Malaev, M / Malik, Q W / Malinina, L / Mal'Kevich, D / Malzacher, P / Mandaglio, G / Manko, V / Manso, F / Manzari, V / Mao, Y / Marchisone, M / Mareš, J / Margagliotti, G V / Margotti, A / Marín, A / Markert, C / Marquard, M / Martin, C D / Martin, N A / Martinengo, P / Martinez, J L / Martínez, M I / Martínez García, G / Masciocchi, S / Masera, M / Masoni, A / Massacrier, L / Masson, E / Mastroserio, A / Mathis, A M / Matonoha, O / Matuoka, P F T / Matyja, A / Mayer, C / Mazzaschi, F / Mazzilli, M / Mazzoni, M A / Mechler, A F / Meddi, F / Melikyan, Y / Menchaca-Rocha, A / Mengke, C / Meninno, E / Menon, A S / Meres, M / Mhlanga, S / Miake, Y / Micheletti, L / Migliorin, L C / Mihaylov, D L / Mikhaylov, K / Mishra, A N / Miśkowiec, D / Modak, A / Mohammadi, N / Mohanty, A P / Mohanty, B / Khan, M Mohisin / Moravcova, Z / Mordasini, C / Moreira De Godoy, D A / Moreno, L A P / Morozov, I / Morsch, A / Mrnjavac, T / Muccifora, V / Mudnic, E / Mühlheim, D / Muhuri, S / Mulligan, J D / Mulliri, A / Munhoz, M G / Munzer, R H / Murakami, H / Murray, S / Musa, L / Musinsky, J / Myers, C J / Myrcha, J W / Naik, B / Nair, R / Nandi, B K / Nania, R / Nappi, E / Naru, M U / Nassirpour, A F / Nattrass, C / Nayak, R / Nayak, T K / Nazarenko, S / Neagu, A / Negrao De Oliveira, R A / Nellen, L / Nesbo, S V / Neskovic, G / Nesterov, D / Neumann, L T / Nielsen, B S / Nikolaev, S / Nikulin, S / Nikulin, V / Noferini, F / Nomokonov, P / Norman, J / Novitzky, N / Nowakowski, P / Nyanin, A / Nystrand, J / Ogino, M / Ohlson, A / Oleniacz, J / Oliveira Da Silva, A C / Oliver, M H / Oppedisano, C / Ortiz Velasquez, A / Oskarsson, A / Otwinowski, J / Oyama, K / Pachmayer, Y / Pacik, V / Padhan, S / Pagano, D / Paić, G / Pan, J / Panebianco, S / Pareek, P / Park, J / Parkkila, J E / Parmar, S / Pathak, S P / Paul, B / Pazzini, J / Pei, H / Peitzmann, T / Peng, X / Pereira, L G / Pereira Da Costa, H / Peresunko, D / Perez, G M / Perrin, S / Pestov, Y / Petráček, V / Petrovici, M / Pezzi, R P / Piano, S / Pikna, M / Pillot, P / Pinazza, O / Pinsky, L / Pinto, C / Pisano, S / Pistone, D / Płoskoń, M / Planinic, M / Pliquett, F / Poghosyan, M G / Polichtchouk, B / Poljak, N / Pop, A / Porteboeuf-Houssais, S / Pozdniakov, V / Prasad, S K / Preghenella, R / Prino, F / Pruneau, C A / Pshenichnov, I / Puccio, M / Putschke, J / Qiu, S / Quaglia, L / Quishpe, R E / Ragoni, S / Raha, S / Rajput, S / Rak, J / Rakotozafindrabe, A / Ramello, L / Rami, F / Ramirez, S A R / Raniwala, R / Raniwala, S / Räsänen, S S / Rath, R / Ratza, V / Ravasenga, I / Read, K F / Redelbach, A R / Redlich, K / Rehman, A / Reichelt, P / Reidt, F / Ren, X / Renfordt, R / Rescakova, Z / Reygers, K / Riabov, A / Riabov, V / Richert, T / Richter, M / Riedler, P / Riegler, W / Riggi, F / Ristea, C / Rode, S P / Rodríguez Cahuantzi, M / Røed, K / Rogalev, R / Rogochaya, E / Rohr, D / Röhrich, D / Rojas, P F / Rokita, P S / Ronchetti, F / Rosano, A / Rosas, E D / Roslon, K / Rossi, A / Rotondi, A / Roy, A / Roy, P / Rueda, O V / Rui, R / Rumyantsev, B / Rustamov, A / Ryabinkin, E / Ryabov, Y / Rybicki, A / Rytkonen, H / Saarimaki, O A M / Sadek, R / Sadhu, S / Sadovsky, S / Šafařík, K / Saha, S K / Sahoo, B / Sahoo, P / Sahoo, R / Sahoo, S / Sahu, P K / Saini, J / Sakai, S / Sambyal, S / Samsonov, V / Sarkar, D / Sarkar, N / Sarma, P / Sarti, V M / Sas, M H P / Scapparone, E / Schambach, J / Scheid, H S / Schiaua, C / Schicker, R / Schmah, A / Schmidt, C / Schmidt, H R / Schmidt, M O / Schmidt, M / Schmidt, N V / Schmier, A R / Schukraft, J / Schutz, Y / Schwarz, K / Schweda, K / Scioli, G / Scomparin, E / Seger, J E / Sekiguchi, Y / Sekihata, D / Selyuzhenkov, I / Senyukov, S / Serebryakov, D / Sevcenco, A / Shabanov, A / Shabetai, A / Shahoyan, R / Shaikh, W / Shangaraev, A / Sharma, A / Sharma, H / Sharma, M / Sharma, N / Sharma, S / Sheibani, O / Shigaki, K / Shimomura, M / Shirinkin, S / Shou, Q / Sibiriak, Y / Siddhanta, S / Siemiarczuk, T / Silvermyr, D / Simatovic, G / Simonetti, G / Singh, B / Singh, R / Singh, V K / Singhal, V / Sinha, T / Sitar, B / Sitta, M / Skaali, T B / Slupecki, M / Smirnov, N / Snellings, R J M / Soncco, C / Song, J / Songmoolnak, A / Soramel, F / Sorensen, S / Sputowska, I / Stachel, J / Stan, I / Steffanic, P J / Stenlund, E / Stiefelmaier, S F / Stocco, D / Storetvedt, M M / Stritto, L D / Suaide, A A P / Sugitate, T / Suire, C / Suleymanov, M / Suljic, M / Sultanov, R / Šumbera, M / Sumberia, V / Sumowidagdo, S / Swain, S / Szabo, A / Szarka, I / Tabassam, U / Taghavi, S F / Taillepied, G / Takahashi, J / Tambave, G J / Tang, S / Tarhini, M / Tarzila, M G / Tauro, A / Tejeda Muñoz, G / Telesca, A / Terlizzi, L / Terrevoli, C / Thakur, D / Thakur, S / Thomas, D / Thoresen, F / Tieulent, R / Tikhonov, A / Timmins, A R / Toia, A / Topilskaya, N / Toppi, M / Torales-Acosta, F / Torres, S R / Trifiró, A / Tripathy, S / Tripathy, T / Trogolo, S / Trombetta, G / Tropp, L / Trubnikov, V / Trzaska, W H / Trzcinski, T P / Trzeciak, B A / Tumkin, A / Turrisi, R / Tveter, T S / Ullaland, K / Umaka, E N / Uras, A / Usai, G L / Vala, M / Valle, N / Vallero, S / van der Kolk, N / van Doremalen, L V R / van Leeuwen, M / Vande Vyvre, P / Varga, D / Varga, Z / Varga-Kofarago, M / Vargas, A / Vasileiou, M / Vasiliev, A / Vázquez Doce, O / Vechernin, V / Vercellin, E / Vergara Limón, S / Vermunt, L / Vernet, R / Vértesi, R / Vickovic, L / Vilakazi, Z / Villalobos Baillie, O / Vino, G / Vinogradov, A / Virgili, T / Vislavicius, V / Vodopyanov, A / Volkel, B / Völkl, M A / Voloshin, K / Voloshin, S A / Volpe, G / von Haller, B / Vorobyev, I / Voscek, D / Vrláková, J / Wagner, B / Weber, M / Weber, S G / Wegrzynek, A / Wenzel, S C / Wessels, J P / Wiechula, J / Wikne, J / Wilk, G / Wilkinson, J / Willems, G A / Willsher, E / Windelband, B / Winn, M / Witt, W E / Wright, J R / Wu, Y / Xu, R / Yalcin, S / Yamaguchi, Y / Yamakawa, K / Yang, S / Yano, S / Yin, Z / Yokoyama, H / Yoo, I-K / Yoon, J H / Yuan, S / Yuncu, A / Yurchenko, V / Zaccolo, V / Zaman, A / Zampolli, C / Zanoli, H J C / Zardoshti, N / Zarochentsev, A / Závada, P / Zaviyalov, N / Zbroszczyk, H / Zhalov, M / Zhang, S / Zhang, X / Zhang, Z / Zherebchevskii, V / Zhi, Y / Zhou, D / Zhou, Y / Zhou, Z / Zhu, J / Zhu, Y / Zichichi, A / Zinovjev, G / Zurlo, N

    Physical review letters

    2021  Volume 126, Issue 16, Page(s) 162001

    Abstract: The elliptic flow of electrons from beauty hadron decays at midrapidity (|y|<0.8) is measured in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the LHC. The azimuthal distribution of the particles produced in the collisions can be ... ...

    Abstract The elliptic flow of electrons from beauty hadron decays at midrapidity (|y|<0.8) is measured in Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV with the ALICE detector at the LHC. The azimuthal distribution of the particles produced in the collisions can be parametrized with a Fourier expansion, in which the second harmonic coefficient represents the elliptic flow, v_{2}. The v_{2} coefficient of electrons from beauty hadron decays is measured for the first time in the transverse momentum (p_{T}) range 1.3-6  GeV/c in the centrality class 30%-50%. The measurement of electrons from beauty-hadron decays exploits their larger mean proper decay length cτ≈500  μm compared to that of charm hadrons and most of the other background sources. The v_{2} of electrons from beauty hadron decays at midrapidity is found to be positive with a significance of 3.75  σ. The results provide insights into the degree of thermalization of beauty quarks in the medium. A model assuming full thermalization of beauty quarks is strongly disfavored by the measurement at high p_{T}, but is in agreement with the results at low p_{T}. Transport models including substantial interactions of beauty quarks with an expanding strongly interacting medium describe the measurement within uncertainties.
    Language English
    Publishing date 2021-05-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.162001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Soft-Dielectron Excess in Proton-Proton Collisions at sqrt[s]=13  TeV.

    Acharya, S / Adamová, D / Adler, A / Adolfsson, J / Aggarwal, M M / Aglieri Rinella, G / Agnello, M / Agrawal, N / Ahammed, Z / Ahmad, S / Ahn, S U / Akbar, Z / Akindinov, A / Al-Turany, M / Alam, S N / Albuquerque, D S D / Aleksandrov, D / Alessandro, B / Alfanda, H M /
    Alfaro Molina, R / Ali, B / Ali, Y / Alici, A / Alizadehvandchali, N / Alkin, A / Alme, J / Alt, T / Altenkamper, L / Altsybeev, I / Anaam, M N / Andrei, C / Andreou, D / Andronic, A / Angeletti, M / Anguelov, V / Anson, C / Antičić, T / Antinori, F / Antonioli, P / Apadula, N / Aphecetche, L / Appelshäuser, H / Arcelli, S / Arnaldi, R / Arratia, M / Arsene, I C / Arslandok, M / Augustinus, A / Averbeck, R / Aziz, S / Azmi, M D / Badalà, A / Baek, Y W / Bagnasco, S / Bai, X / Bailhache, R / Bala, R / Balbino, A / Baldisseri, A / Ball, M / Balouza, S / Banerjee, D / Barbera, R / Barioglio, L / Barnaföldi, G G / Barnby, L S / Barret, V / Bartalini, P / Bartels, C / Barth, K / Bartsch, E / Baruffaldi, F / Bastid, N / Basu, S / Batigne, G / Batyunya, B / Bauri, D / Bazo Alba, J L / Bearden, I G / Beattie, C / Bedda, C / Behera, N K / Belikov, I / Bell Hechavarria, A D C / Bellini, F / Bellwied, R / Belyaev, V / Bencedi, G / Beole, S / Bercuci, A / Berdnikov, Y / Berenyi, D / Bertens, R A / Berzano, D / Besoiu, M G / Betev, L / Bhasin, A / Bhat, I R / Bhat, M A / Bhatt, H / Bhattacharjee, B / Bianchi, A / Bianchi, L / Bianchi, N / Bielčík, J / Bielčíková, J / Bilandzic, A / Biro, G / Biswas, R / Biswas, S / Blair, J T / Blau, D / Blume, C / Boca, G / Bock, F / Bogdanov, A / Boi, S / Bok, J / Boldizsár, L / Bolozdynya, A / Bombara, M / Bonomi, G / Borel, H / Borissov, A / Bossi, H / Botta, E / Bratrud, L / Braun-Munzinger, P / Bregant, M / Broz, M / Bruna, E / Bruno, G E / Buckland, M D / Budnikov, D / Buesching, H / Bufalino, S / Bugnon, O / Buhler, P / Buncic, P / Buthelezi, Z / Butt, J B / Bysiak, S A / Caffarri, D / Caliva, A / Calvo Villar, E / Camacho, J M M / Camacho, R S / Camerini, P / Canedo, F D M / Capon, A A / Carnesecchi, F / Caron, R / Castillo Castellanos, J / Castro, A J / Casula, E A R / Catalano, F / Ceballos Sanchez, C / Chakraborty, P / Chandra, S / Chang, W / Chapeland, S / Chartier, M / Chattopadhyay, S / Chauvin, A / Cheshkov, C / Cheynis, B / Chibante Barroso, V / Chinellato, D D / Cho, S / Chochula, P / Chowdhury, T / Christakoglou, P / Christensen, C H / Christiansen, P / Chujo, T / Cicalo, C / Cifarelli, L / Cilladi, L D / Cindolo, F / Ciupek, M R / Clai, G / Cleymans, J / Colamaria, F / Colella, D / Collu, A / Colocci, M / Concas, M / Conesa Balbastre, G / Conesa Del Valle, Z / Contin, G / Contreras, J G / Cormier, T M / Corrales Morales, Y / Cortese, P / Cosentino, M R / Costa, F / Costanza, S / Crochet, P / Cuautle, E / Cui, P / Cunqueiro, L / Dabrowski, D / Dahms, T / Dainese, A / Damas, F P A / Danisch, M C / Danu, A / Das, D / Das, I / Das, P / Das, S / Dash, A / Dash, S / De, S / De Caro, A / de Cataldo, G / de Cuveland, J / De Falco, A / De Gruttola, D / De Marco, N / De Pasquale, S / Deb, S / Degenhardt, H F / Deja, K R / Deloff, A / Delsanto, S / Deng, W / Dhankher, P / Di Bari, D / Di Mauro, A / Diaz, R A / Dietel, T / Dillenseger, P / Ding, Y / Divià, R / Dixit, D U / Djuvsland, Ø / Dmitrieva, U / Dobrin, A / Dönigus, B / Dordic, O / Dubey, A K / Dubla, A / Dudi, S / Dukhishyam, M / Dupieux, P / Ehlers, R J / Eikeland, V N / Elia, D / Erazmus, B / Erhardt, F / Erokhin, A / Ersdal, M R / Espagnon, B / Eulisse, G / Evans, D / Evdokimov, S / Fabbietti, L / Faggin, M / Faivre, J / Fan, F / Fantoni, A / Fasel, M / Fecchio, P / Feliciello, A / Feofilov, G / Fernández Téllez, A / Ferrero, A / Ferretti, A / Festanti, A / Feuillard, V J G / Figiel, J / Filchagin, S / Finogeev, D / Fionda, F M / Fiorenza, G / Flor, F / Flores, A N / Foertsch, S / Foka, P / Fokin, S / Fragiacomo, E / Frankenfeld, U / Fuchs, U / Furget, C / Furs, A / Fusco Girard, M / Gaardhøje, J J / Gagliardi, M / Gago, A M / Gal, A / Galvan, C D / Ganoti, P / Garabatos, C / Garcia, J R A / Garcia-Solis, E / Garg, K / Gargiulo, C / Garibli, A / Garner, K / Gasik, P / Gauger, E F / Gay Ducati, M B / Germain, M / Ghosh, J / Ghosh, P / Ghosh, S K / Giacalone, M / Gianotti, P / Giubellino, P / Giubilato, P / Glaenzer, A M C / Glässel, P / Gomez Ramirez, A / Gonzalez, V / González-Trueba, L H / Gorbunov, S / Görlich, L / Goswami, A / Gotovac, S / Grabski, V / Graczykowski, L K / Graham, K L / Greiner, L / Grelli, A / Grigoras, C / Grigoriev, V / Grigoryan, A / Grigoryan, S / Groettvik, O S / Grosa, F / Grosse-Oetringhaus, J F / Grosso, R / Guernane, R / Guittiere, M / Gulbrandsen, K / Gunji, T / Gupta, A / Gupta, R / Guzman, I B / Haake, R / Habib, M K / Hadjidakis, C / Hamagaki, H / Hamar, G / Hamid, M / Hannigan, R / Haque, M R / Harlenderova, A / Harris, J W / Harton, A / Hasenbichler, J A / Hassan, H / Hassan, Q U / Hatzifotiadou, D / Hauer, P / Havener, L B / Hayashi, S / Heckel, S T / Hellbär, E / Helstrup, H / Herghelegiu, A / Herman, T / Hernandez, E G / Herrera Corral, G / Herrmann, F / Hetland, K F / Hillemanns, H / Hills, C / Hippolyte, B / Hohlweger, B / Honermann, J / Horak, D / Hornung, A / Hornung, S / Hosokawa, R / Hristov, P / Huang, C / Hughes, C / Huhn, P / Humanic, T J / Hushnud, H / Husova, L A / Hussain, N / Hussain, S A / Hutter, D / Iddon, J P / Ilkaev, R / Ilyas, H / Inaba, M / Innocenti, G M / Ippolitov, M / Isakov, A / Islam, M S / Ivanov, M / Ivanov, V / Izucheev, V / Jacak, B / Jacazio, N / Jacobs, P M / Jadlovska, S / Jadlovsky, J / Jaelani, S / Jahnke, C / Jakubowska, M J / Janik, M A / Janson, T / Jercic, M / Jevons, O / Jin, M / Jonas, F / Jones, P G / Jung, J / Jung, M / Jusko, A / Kalinak, P / Kalweit, A / Kaplin, V / Kar, S / Karasu Uysal, A / Karatovic, D / Karavichev, O / Karavicheva, T / Karczmarczyk, P / Karpechev, E / Kazantsev, A / Kebschull, U / Keidel, R / Keil, M / Ketzer, B / Khabanova, Z / Khan, A M / Khan, S / Khanzadeev, A / Kharlov, Y / Khatun, A / Khuntia, A / Kileng, B / Kim, B / Kim, D / Kim, D J / Kim, E J / Kim, H / Kim, J / Kim, J S / Kim, M / Kim, S / Kim, T / Kirsch, S / Kisel, I / Kiselev, S / Kisiel, A / Klay, J L / Klein, C / Klein, J / Klein, S / Klein-Bösing, C / Kleiner, M / Kluge, A / Knichel, M L / Knospe, A G / Kobdaj, C / Köhler, M K / Kollegger, T / Kondratyev, A / Kondratyeva, N / Kondratyuk, E / Konig, J / Konigstorfer, S A / Konopka, P J / Kornakov, G / Koska, L / Kovalenko, O / Kovalenko, V / Kowalski, M / Králik, I / Kravčáková, A / Kreis, L / Krivda, M / Krizek, F / Krizkova Gajdosova, K / Krüger, M / Kryshen, E / Krzewicki, M / Kubera, A M / Kučera, V / Kuhn, C / Kuijer, P G / Kumar, L / Kundu, S / Kurashvili, P / Kurepin, A / Kurepin, A B / Kuryakin, A / Kushpil, S / Kvapil, J / Kweon, M J / Kwon, J Y / Kwon, Y / La Pointe, S L / La Rocca, P / Lai, Y S / Lamanna, M / Langoy, R / Lapidus, K / Lardeux, A / Larionov, P / Laudi, E / Lavicka, R / Lazareva, T / Lea, R / Leardini, L / Lee, J / Lee, S / Lehner, S / Lehrbach, J / Lemmon, R C / León Monzón, I / Lesser, E D / Lettrich, M / Lévai, P / Li, X / Li, X L / Lien, J / Lietava, R / Lim, B / Lindenstruth, V / Lindner, A / Lippmann, C / Lisa, M A / Liu, A / Liu, J / Liu, S / Llope, W J / Lofnes, I M / Loginov, V / Loizides, C / Loncar, P / Lopez, J A / Lopez, X / López Torres, E / Luhder, J R / Lunardon, M / Luparello, G / Ma, Y G / Maevskaya, A / Mager, M / Mahmood, S M / Mahmoud, T / Maire, A / Majka, R D / Malaev, M / Malik, Q W / Malinina, L / Mal'Kevich, D / Malzacher, P / Mandaglio, G / Manko, V / Manso, F / Manzari, V / Mao, Y / Marchisone, M / Mareš, J / Margagliotti, G V / Margotti, A / Marín, A / Markert, C / Marquard, M / Martin, C D / Martin, N A / Martinengo, P / Martinez, J L / Martínez, M I / Martínez García, G / Masciocchi, S / Masera, M / Masoni, A / Massacrier, L / Masson, E / Mastroserio, A / Mathis, A M / Matonoha, O / Matuoka, P F T / Matyja, A / Mayer, C / Mazzaschi, F / Mazzilli, M / Mazzoni, M A / Mechler, A F / Meddi, F / Melikyan, Y / Menchaca-Rocha, A / Mengke, C / Meninno, E / Menon, A S / Meres, M / Mhlanga, S / Miake, Y / Micheletti, L / Migliorin, L C / Mihaylov, D L / Mikhaylov, K / Mishra, A N / Miśkowiec, D / Modak, A / Mohammadi, N / Mohanty, A P / Mohanty, B / Mohisin Khan, M / Moravcova, Z / Mordasini, C / Moreira De Godoy, D A / Moreno, L A P / Morozov, I / Morsch, A / Mrnjavac, T / Muccifora, V / Mudnic, E / Mühlheim, D / Muhuri, S / Mulligan, J D / Mulliri, A / Munhoz, M G / Munzer, R H / Murakami, H / Murray, S / Musa, L / Musinsky, J / Myers, C J / Myrcha, J W / Naik, B / Nair, R / Nandi, B K / Nania, R / Nappi, E / Naru, M U / Nassirpour, A F / Nattrass, C / Nayak, R / Nayak, T K / Nazarenko, S / Neagu, A / Negrao De Oliveira, R A / Nellen, L / Nesbo, S V / Neskovic, G / Nesterov, D / Neumann, L T / Nielsen, B S / Nikolaev, S / Nikulin, S / Nikulin, V / Noferini, F / Nomokonov, P / Norman, J / Novitzky, N / Nowakowski, P / Nyanin, A / Nystrand, J / Ogino, M / Ohlson, A / Oleniacz, J / Oliveira Da Silva, A C / Oliver, M H / Oppedisano, C / Ortiz Velasquez, A / Oskarsson, A / Otwinowski, J / Oyama, K / Pachmayer, Y / Pacik, V / Padhan, S / Pagano, D / Paić, G / Pan, J / Panebianco, S / Pareek, P / Park, J / Parkkila, J E / Parmar, S / Pathak, S P / Paul, B / Pazzini, J / Pei, H / Peitzmann, T / Peng, X / Pereira, L G / Pereira Da Costa, H / Peresunko, D / Perez, G M / Perrin, S / Pestov, Y / Petráček, V / Petrovici, M / Pezzi, R P / Piano, S / Pikna, M / Pillot, P / Pinazza, O / Pinsky, L / Pinto, C / Pisano, S / Pistone, D / Płoskoń, M / Planinic, M / Pliquett, F / Poghosyan, M G / Polichtchouk, B / Poljak, N / Pop, A / Porteboeuf-Houssais, S / Pozdniakov, V / Prasad, S K / Preghenella, R / Prino, F / Pruneau, C A / Pshenichnov, I / Puccio, M / Putschke, J / Qiu, S / Quaglia, L / Quishpe, R E / Ragoni, S / Raha, S / Rajput, S / Rak, J / Rakotozafindrabe, A / Ramello, L / Rami, F / Ramirez, S A R / Raniwala, R / Raniwala, S / Räsänen, S S / Rath, R / Ratza, V / Ravasenga, I / Read, K F / Redelbach, A R / Redlich, K / Rehman, A / Reichelt, P / Reidt, F / Ren, X / Renfordt, R / Rescakova, Z / Reygers, K / Riabov, A / Riabov, V / Richert, T / Richter, M / Riedler, P / Riegler, W / Riggi, F / Ristea, C / Rode, S P / Rodríguez Cahuantzi, M / Røed, K / Rogalev, R / Rogochaya, E / Rohr, D / Röhrich, D / Rojas, P F / Rokita, P S / Ronchetti, F / Rosano, A / Rosas, E D / Roslon, K / Rossi, A / Rotondi, A / Roy, A / Roy, P / Rueda, O V / Rui, R / Rumyantsev, B / Rustamov, A / Ryabinkin, E / Ryabov, Y / Rybicki, A / Rytkonen, H / Saarimaki, O A M / Sadek, R / Sadhu, S / Sadovsky, S / Šafařík, K / Saha, S K / Sahoo, B / Sahoo, P / Sahoo, R / Sahoo, S / Sahu, P K / Saini, J / Sakai, S / Sambyal, S / Samsonov, V / Sarkar, D / Sarkar, N / Sarma, P / Sarti, V M / Sas, M H P / Scapparone, E / Schambach, J / Scheid, H S / Schiaua, C / Schicker, R / Schmah, A / Schmidt, C / Schmidt, H R / Schmidt, M O / Schmidt, M / Schmidt, N V / Schmier, A R / Schukraft, J / Schutz, Y / Schwarz, K / Schweda, K / Scioli, G / Scomparin, E / Seger, J E / Sekiguchi, Y / Sekihata, D / Selyuzhenkov, I / Senyukov, S / Serebryakov, D / Sevcenco, A / Shabanov, A / Shabetai, A / Shahoyan, R / Shaikh, W / Shangaraev, A / Sharma, A / Sharma, H / Sharma, M / Sharma, N / Sharma, S / Sheibani, O / Shigaki, K / Shimomura, M / Shirinkin, S / Shou, Q / Sibiriak, Y / Siddhanta, S / Siemiarczuk, T / Silvermyr, D / Simatovic, G / Simonetti, G / Singh, B / Singh, R / Singh, V K / Singhal, V / Sinha, T / Sitar, B / Sitta, M / Skaali, T B / Slupecki, M / Smirnov, N / Snellings, R J M / Soncco, C / Song, J / Songmoolnak, A / Soramel, F / Sorensen, S / Sputowska, I / Stachel, J / Stan, I / Steffanic, P J / Stenlund, E / Stiefelmaier, S F / Stocco, D / Storetvedt, M M / Stritto, L D / Suaide, A A P / Sugitate, T / Suire, C / Suleymanov, M / Suljic, M / Sultanov, R / Šumbera, M / Sumberia, V / Sumowidagdo, S / Swain, S / Szabo, A / Szarka, I / Tabassam, U / Taghavi, S F / Taillepied, G / Takahashi, J / Tambave, G J / Tang, S / Tarhini, M / Tarzila, M G / Tauro, A / Tejeda Muñoz, G / Telesca, A / Terlizzi, L / Terrevoli, C / Thakur, D / Thakur, S / Thomas, D / Thoresen, F / Tieulent, R / Tikhonov, A / Timmins, A R / Toia, A / Topilskaya, N / Toppi, M / Torales-Acosta, F / Torres, S R / Trifiró, A / Tripathy, S / Tripathy, T / Trogolo, S / Trombetta, G / Tropp, L / Trubnikov, V / Trzaska, W H / Trzcinski, T P / Trzeciak, B A / Tumkin, A / Turrisi, R / Tveter, T S / Ullaland, K / Umaka, E N / Uras, A / Usai, G L / Vala, M / Valle, N / Vallero, S / van der Kolk, N / van Doremalen, L V R / van Leeuwen, M / Vande Vyvre, P / Varga, D / Varga, Z / Varga-Kofarago, M / Vargas, A / Vasileiou, M / Vasiliev, A / Vázquez Doce, O / Vechernin, V / Vercellin, E / Vergara Limón, S / Vermunt, L / Vernet, R / Vértesi, R / Vickovic, L / Vilakazi, Z / Villalobos Baillie, O / Vino, G / Vinogradov, A / Virgili, T / Vislavicius, V / Vodopyanov, A / Volkel, B / Völkl, M A / Voloshin, K / Voloshin, S A / Volpe, G / von Haller, B / Vorobyev, I / Voscek, D / Vrláková, J / Wagner, B / Weber, M / Weber, S G / Wegrzynek, A / Wenzel, S C / Wessels, J P / Wiechula, J / Wikne, J / Wilk, G / Wilkinson, J / Willems, G A / Willsher, E / Windelband, B / Winn, M / Witt, W E / Wright, J R / Wu, Y / Xu, R / Yalcin, S / Yamaguchi, Y / Yamakawa, K / Yang, S / Yano, S / Yin, Z / Yokoyama, H / Yoo, I-K / Yoon, J H / Yuan, S / Yuncu, A / Yurchenko, V / Zaccolo, V / Zaman, A / Zampolli, C / Zanoli, H J C / Zardoshti, N / Zarochentsev, A / Závada, P / Zaviyalov, N / Zbroszczyk, H / Zhalov, M / Zhang, S / Zhang, X / Zhang, Z / Zherebchevskii, V / Zhi, Y / Zhou, D / Zhou, Y / Zhou, Z / Zhu, J / Zhu, Y / Zichichi, A / Zinovjev, G / Zurlo, N

    Physical review letters

    2021  Volume 127, Issue 4, Page(s) 42302

    Abstract: A measurement of dielectron production in proton-proton (pp) collisions at sqrt[s]=13  TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the ... ...

    Abstract A measurement of dielectron production in proton-proton (pp) collisions at sqrt[s]=13  TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass m_{ee} and pair transverse momentum p_{T,ee} that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of m_{ee}, p_{T,ee}, and event multiplicity dN_{ch}/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π^{0} ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<m_{ee}<0.6  GeV/c^{2} and for p_{T,ee}<0.4  GeV/c indicates an enhancement of soft dielectrons, reminiscent of the "anomalous" soft-photon and soft-dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat)±0.17(syst,data)±0.34(syst,cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in m_{ee} and p_{T,ee} are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.<br />
    Language English
    Publishing date 2021-08-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.042302
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Λ_{c}^{+} Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at sqrt[s_{NN}]=5.02  TeV at the LHC.

    Acharya, S / Adamová, D / Adler, A / Adolfsson, J / Aglieri Rinella, G / Agnello, M / Agrawal, N / Ahammed, Z / Ahmad, S / Ahn, S U / Akbar, Z / Akindinov, A / Al-Turany, M / Albuquerque, D S D / Aleksandrov, D / Alessandro, B / Alfanda, H M / Alfaro Molina, R / Ali, B /
    Ali, Y / Alici, A / Alizadehvandchali, N / Alkin, A / Alme, J / Alt, T / Altenkamper, L / Altsybeev, I / Anaam, M N / Andrei, C / Andreou, D / Andronic, A / Angeletti, M / Anguelov, V / Antičić, T / Antinori, F / Antonioli, P / Apadula, N / Aphecetche, L / Appelshäuser, H / Arcelli, S / Arnaldi, R / Arratia, M / Arsene, I C / Arslandok, M / Augustinus, A / Averbeck, R / Aziz, S / Azmi, M D / Badalà, A / Baek, Y W / Bai, X / Bailhache, R / Bala, R / Balbino, A / Baldisseri, A / Ball, M / Banerjee, D / Barbera, R / Barioglio, L / Barlou, M / Barnaföldi, G G / Barnby, L S / Barret, V / Bartels, C / Barth, K / Bartsch, E / Baruffaldi, F / Bastid, N / Basu, S / Batigne, G / Batyunya, B / Bauri, D / Bazo Alba, J L / Bearden, I G / Beattie, C / Belikov, I / Bell Hechavarria, A D C / Bellini, F / Bellwied, R / Belokurova, S / Belyaev, V / Bencedi, G / Beole, S / Bercuci, A / Berdnikov, Y / Berdnikova, A / Berenyi, D / Bergmann, L / Besoiu, M G / Betev, L / Bhaduri, P P / Bhasin, A / Bhat, 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    Physical review letters

    2021  Volume 127, Issue 20, Page(s) 202301

    Abstract: The prompt production of the charm baryon Λ_{c}^{+} and the Λ_{c}^{+}/D^{0} production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at sqrt[s_{NN}]=5.02  TeV. These new measurements show a clear decrease of the Λ_{ ...

    Abstract The prompt production of the charm baryon Λ_{c}^{+} and the Λ_{c}^{+}/D^{0} production ratios were measured at midrapidity with the ALICE detector in pp and p-Pb collisions at sqrt[s_{NN}]=5.02  TeV. These new measurements show a clear decrease of the Λ_{c}^{+}/D^{0} ratio with increasing transverse momentum (p_{T}) in both collision systems in the range 2<p_{T}<12  GeV/c, exhibiting similarities with the light-flavor baryon-to-meson ratios p/π and Λ/K_{S}^{0}. At low p_{T}, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in e^{+}e^{-} and e^{-}p collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.<br />
    Language English
    Publishing date 2021-12-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.202301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Probing the Effects of Strong Electromagnetic Fields with Charge-Dependent Directed Flow in Pb-Pb Collisions at the LHC.

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    Physical review letters

    2020  Volume 125, Issue 2, Page(s) 22301

    Abstract: The first measurement at the LHC of charge-dependent directed flow (v_{1}) relative to the spectator plane is presented for Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV. Results are reported for charged hadrons and D^{0} mesons for the transverse momentum ... ...

    Abstract The first measurement at the LHC of charge-dependent directed flow (v_{1}) relative to the spectator plane is presented for Pb-Pb collisions at sqrt[s_{NN}]=5.02  TeV. Results are reported for charged hadrons and D^{0} mesons for the transverse momentum intervals p_{T}>0.2  GeV/c and 3<p_{T}<6  GeV/c in the 5%-40% and 10%-40% centrality classes, respectively. The difference between the positively and negatively charged hadron v_{1} has a positive slope as a function of pseudorapidity η, dΔv_{1}/dη=[1.68±0.49(stat)±0.41(syst)]×10^{-4}. The same measurement for D^{0} and D[over ¯]^{0} mesons yields a positive value dΔv_{1}/dη=[4.9±1.7(stat)±0.6(syst)]×10^{-1}, which is about 3 orders of magnitude larger than the one of the charged hadrons. These measurements can provide new insights into the effects of the strong electromagnetic field and the initial tilt of matter created in noncentral heavy ion collisions on the dynamics of light (u, d, and s) and heavy (c) quarks. The large difference between the observed Δv_{1} of charged hadrons and D^{0} mesons may reflect different sensitivity of the charm and light quarks to the early time dynamics of a heavy ion collision. These observations challenge some recent theoretical calculations, which predicted a negative and an order of magnitude smaller value of dΔv_{1}/dη for both light flavor and charmed hadrons.<br />
    Language English
    Publishing date 2020-07-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.022301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions.

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    Physical review letters

    2020  Volume 125, Issue 1, Page(s) 12301

    Abstract: The first evidence of spin alignment of vector mesons (K^{*0} and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ_{00} is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of- ... ...

    Abstract The first evidence of spin alignment of vector mesons (K^{*0} and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ_{00} is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sqrt[s_{NN}]) of 2.76 TeV with the ALICE detector. ρ_{00} values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p_{T}<2  GeV/c) for K^{*0} and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K_{S}^{0} meson (spin=0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.
    Language English
    Publishing date 2020-07-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.012301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Physical review letters

    2020  Volume 125, Issue 16, Page(s) 162001

    Abstract: In this Letter, we report the first measurement of the inelastic cross section for antideuteron-nucleus interactions at low particle momenta, covering a range of 0.3≤p<4  GeV/c. The measurement is carried out using p-Pb collisions at a center-of-mass ... ...

    Abstract In this Letter, we report the first measurement of the inelastic cross section for antideuteron-nucleus interactions at low particle momenta, covering a range of 0.3≤p<4  GeV/c. The measurement is carried out using p-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of sqrt[s_{NN}]=5.02  TeV, recorded with the ALICE detector at the CERN LHC and utilizing the detector material as an absorber for antideuterons and antiprotons. The extracted raw primary antiparticle-to-particle ratios are compared to the results from detailed ALICE simulations based on the geant4 toolkit for the propagation of (anti)particles through the detector material. The analysis of the raw primary (anti)proton spectra serves as a benchmark for this study, since their hadronic interaction cross sections are well constrained experimentally. The first measurement of the inelastic cross section for antideuteron-nucleus interactions averaged over the ALICE detector material with atomic mass numbers ⟨A⟩=17.4 and 31.8 is obtained. The measured inelastic cross section points to a possible excess with respect to the Glauber model parametrization used in geant4 in the lowest momentum interval of 0.3≤p<0.47  GeV/c up to a factor 2.1. This result is relevant for the understanding of antimatter propagation and the contributions to antinuclei production from cosmic ray interactions within the interstellar medium. In addition, the momentum range covered by this measurement is of particular importance to evaluate signal predictions for indirect dark-matter searches.
    Language English
    Publishing date 2020-10-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.162001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Scattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC.

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    Physical review letters

    2020  Volume 124, Issue 9, Page(s) 92301

    Abstract: The study of the strength and behavior of the antikaon-nucleon (K[over ¯]N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the ... ...

    Abstract The study of the strength and behavior of the antikaon-nucleon (K[over ¯]N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K^{+}p⊕K^{-}p[over ¯]) and (K^{-}p⊕K^{+}p[over ¯]) pairs measured in pp collisions at sqrt[s]=5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58  MeV/c in the measured correlation function of (K^{-}p⊕K^{+}p[over ¯]) with a significance of 4.4σ constitutes the first experimental evidence for the opening of the (K[over ¯]^{0}n⊕K^{0}n[over ¯]) isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Jülich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the K[over ¯]N threshold for low-energy QCD chiral models.
    Language English
    Publishing date 2020-03-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.124.092301
    Database MEDical Literature Analysis and Retrieval System OnLINE

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