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Book ; Online: High Pileup Particle Tracking with Object Condensation

Lieret, Kilian / DeZoort, Gage / Chatterjee, Devdoot / Park, Jian / Miao, Siqi / Li, Pan

2023

Abstract: Recent work has demonstrated that graph neural networks (GNNs) can match the performance of traditional algorithms for charged particle tracking while improving scalability to meet the computing challenges posed by the HL-LHC. Most GNN tracking ... ...

Abstract	Recent work has demonstrated that graph neural networks (GNNs) can match the performance of traditional algorithms for charged particle tracking while improving scalability to meet the computing challenges posed by the HL-LHC. Most GNN tracking algorithms are based on edge classification and identify tracks as connected components from an initial graph containing spurious connections. In this talk, we consider an alternative based on object condensation (OC), a multi-objective learning framework designed to cluster points (hits) belonging to an arbitrary number of objects (tracks) and regress the properties of each object. Building on our previous results, we present a streamlined model and show progress toward a one-shot OC tracking algorithm in a high-pileup environment. Comment: 8 pages, 6 figures, 8th International Connecting The Dots Workshop (Toulouse 2023)
Keywords	Physics - Data Analysis ; Statistics and Probability ; Computer Science - Machine Learning ; High Energy Physics - Experiment
Subject code	006
Publishing date	2023-12-06
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Punzi-loss:: a non-differentiable metric approximation for sensitivity optimisation in the search for new particles.

Abudinén, F / Bertemes, M / Bilokin, S / Campajola, M / Casarosa, G / Cunliffe, S / Corona, L / De Nuccio, M / De Pietro, G / Dey, S / Eliachevitch, M / Feichtinger, P / Ferber, T / Gemmler, J / Goldenzweig, P / Gottmann, A / Graziani, E / Haigh, H / Hohmann, M /

Humair, T / Inguglia, G / Kahn, J / Keck, T / Komarov, I / Krohn, J-F / Kuhr, T / Lacaprara, S / Lieret, K / Maiti, R / Martini, A / Meier, F / Metzner, F / Milesi, M / Park, S-H / Prim, M / Pulvermacher, C / Ritter, M / Sato, Y / Schwanda, C / Sutcliffe, W / Tamponi, U / Tenchini, F / Urquijo, P / Zani, L / Žlebčík, R / Zupanc, A

The European physical journal. C, Particles and fields

2022 Volume 82, Issue 2, Page(s) 121

Abstract: We present the novel implementation of a non-differentiable metric approximation and a corresponding loss-scheduling aimed at the search for new particles of unknown mass in high energy physics experiments. We call the loss-scheduling, based on the ... ...

Abstract	We present the novel implementation of a non-differentiable metric approximation and a corresponding loss-scheduling aimed at the search for new particles of unknown mass in high energy physics experiments. We call the loss-scheduling, based on the minimisation of a figure-of-merit related function typical of particle physics, a Punzi-loss function, and the neural network that utilises this loss function a Punzi-net. We show that the Punzi-net outperforms standard multivariate analysis techniques and generalises well to mass hypotheses for which it was not trained. This is achieved by training a single classifier that provides a coherent and optimal classification of all signal hypotheses over the whole search space. Our result constitutes a complementary approach to fully differentiable analyses in particle physics. We implemented this work using PyTorch and provide users full access to a public repository containing all the codes and a training example.
Language	English
Publishing date	2022-02-08
Publishing country	France
Document type	Journal Article
ZDB-ID	1459069-4
ISSN	1434-6052 ; 1434-6044
ISSN (online)	1434-6052
ISSN	1434-6044
DOI	10.1140/epjc/s10052-022-10070-0
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Book ; Online: Software Sustainability & High Energy Physics

Katz, Daniel S. / Malik, Sudhir / Neubauer, Mark S. / Stewart, Graeme A. / Assamagan, Kétévi A. / Becker, Erin A. / Hong, Neil P. Chue / Cosden, Ian A. / Meehan, Samuel / Moyse, Edward J. W. / Price-Whelan, Adrian M. / Sexton-Kennedy, Elizabeth / Evans, Meirin Oan / Feickert, Matthew / Lange, Clemens / Lieret, Kilian / Quick, Rob / Pineda, Arturo Sánchez / Tunnell, Christopher

2020

Abstract: New facilities of the 2020s, such as the High Luminosity Large Hadron Collider (HL-LHC), will be relevant through at least the 2030s. This means that their software efforts and those that are used to analyze their data need to consider sustainability to ... ...

Abstract	New facilities of the 2020s, such as the High Luminosity Large Hadron Collider (HL-LHC), will be relevant through at least the 2030s. This means that their software efforts and those that are used to analyze their data need to consider sustainability to enable their adaptability to new challenges, longevity, and efficiency, over at least this period. This will help ensure that this software will be easier to develop and maintain, that it remains available in the future on new platforms, that it meets new needs, and that it is as reusable as possible. This report discusses a virtual half-day workshop on "Software Sustainability and High Energy Physics" that aimed 1) to bring together experts from HEP as well as those from outside to share their experiences and practices, and 2) to articulate a vision that helps the Institute for Research and Innovation in Software for High Energy Physics (IRIS-HEP) to create a work plan to implement elements of software sustainability. Software sustainability practices could lead to new collaborations, including elements of HEP software being directly used outside the field, and, as has happened more frequently in recent years, to HEP developers contributing to software developed outside the field rather than reinventing it. A focus on and skills related to sustainable software will give HEP software developers an important skill that is essential to careers in the realm of software, inside or outside HEP. The report closes with recommendations to improve software sustainability in HEP, aimed at the HEP community via IRIS-HEP and the HEP Software Foundation (HSF). Comment: A report from the "Sustainable Software in HEP" IRIS-HEP blueprint workshop: https://indico.cern.ch/event/930127/
Keywords	High Energy Physics - Experiment ; Computer Science - Software Engineering
Subject code	020
Publishing date	2020-10-10
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Software Sustainability&High Energy Physics

Katz, Daniel S. / Malik, Sudhir / Neubauer, Mark S. / Stewart, Graeme A. / Assamagan, K'et'evi A. / Becker, Erin A. / Hong, Neil P. Chue / Cosden, Ian A. / Meehan, Samuel / Moyse, Edward J. W. / Price-Whelan, Adrian M. / Sexton-Kennedy, Elizabeth / Evans, Meirin Oan / Feickert, Matthew / Lange, Clemens / Lieret, Kilian / Quick, Rob / Pineda, Arturo S'anchez / Tunnell, Christopher

Abstract	New facilities of the 2020s, such as the High Luminosity Large Hadron Collider (HL-LHC), will be relevant through at least the 2030s. This means that their software efforts and those that are used to analyze their data need to consider sustainability to enable their adaptability to new challenges, longevity, and efficiency, over at least this period. This will help ensure that this software will be easier to develop and maintain, that it remains available in the future on new platforms, that it meets new needs, and that it is as reusable as possible. This report discusses a virtual half-day workshop on"Software Sustainability and High Energy Physics"that aimed 1) to bring together experts from HEP as well as those from outside to share their experiences and practices, and 2) to articulate a vision that helps the Institute for Research and Innovation in Software for High Energy Physics (IRIS-HEP) to create a work plan to implement elements of software sustainability. Software sustainability practices could lead to new collaborations, including elements of HEP software being directly used outside the field, and, as has happened more frequently in recent years, to HEP developers contributing to software developed outside the field rather than reinventing it. A focus on and skills related to sustainable software will give HEP software developers an important skill that is essential to careers in the realm of software, inside or outside HEP. The report closes with recommendations to improve software sustainability in HEP, aimed at the HEP community via IRIS-HEP and the HEP Software Foundation (HSF).
Keywords	covid19
Publisher	ArXiv
Document type	Article ; Online
DOI	10.5281/zenodo.4082137
Database	COVID19

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Article ; Online: Software Training in HEP.

Malik, Sudhir / Meehan, Samuel / Lieret, Kilian / Oan Evans, Meirin / Villanueva, Michel H / Katz, Daniel S / Stewart, Graeme A / Elmer, Peter / Aziz, Sizar / Bellis, Matthew / Bianchi, Riccardo Maria / Bianco, Gianluca / Bonilla, Johan Sebastian / Burger, Angela / Burzynski, Jackson / Chamont, David / Feickert, Matthew / Gadow, Philipp / Gruber, Bernhard Manfred /

Guest, Daniel / Hageboeck, Stephan / Heinrich, Lukas / Horzela, Maximilian M / Huwiler, Marc / Lange, Clemens / Lehmann, Konstantin / Li, Ke / Majumder, Devdatta / Mamužić, Judita / Nelson, Kevin / Newhouse, Robin / Nibigira, Emery / Norberg, Scarlet / Pineda, Arturo Sánchez / Proffitt, Mason / Regnery, Brendan / Roepe, Amber / Roiser, Stefan / Schreiner, Henry / Shadura, Oksana / Stark, Giordon / Swatman, Stephen Nicholas / Thais, Savannah / Valassi, Andrea / Wunsch, Stefan / Yakobovitch, David / Yuan, Siqi

Computing and software for big science

2021 Volume 5, Issue 1, Page(s) 22

Abstract: The long-term sustainability of the high-energy physics (HEP) research software ecosystem is essential to the field. With new facilities and upgrades coming online throughout the 2020s, this will only become increasingly important. Meeting the ... ...

Abstract	The long-term sustainability of the high-energy physics (HEP) research software ecosystem is essential to the field. With new facilities and upgrades coming online throughout the 2020s, this will only become increasingly important. Meeting the sustainability challenge requires a workforce with a combination of HEP domain knowledge and advanced software skills. The required software skills fall into three broad groups. The first is fundamental and generic software engineering (e.g., Unix, version control, C++, and continuous integration). The second is knowledge of domain-specific HEP packages and practices (e.g., the ROOT data format and analysis framework). The third is more advanced knowledge involving specialized techniques, including parallel programming, machine learning and data science tools, and techniques to maintain software projects at all scales. This paper discusses the collective software training program in HEP led by the HEP Software Foundation (HSF) and the Institute for Research and Innovation in Software in HEP (IRIS-HEP). The program equips participants with an array of software skills that serve as ingredients for the solution of HEP computing challenges. Beyond serving the community by ensuring that members are able to pursue research goals, the program serves individuals by providing intellectual capital and transferable skills important to careers in the realm of software and computing, inside or outside HEP.
Language	English
Publishing date	2021-10-08
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2908677-2
ISSN	2510-2044 ; 2510-2036
ISSN (online)	2510-2044
ISSN	2510-2036
DOI	10.1007/s41781-021-00069-9
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Article ; Online: First Measurement of the B^{+}→π^{+}π^{0}π^{0} Branching Fraction and CP Asymmetry.

Lai, Y-T / Adachi, I / Aihara, H / Al Said, S / Asner, D M / Atmacan, H / Aulchenko, V / Aushev, T / Ayad, R / Babu, V / Bahinipati, S / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhuyan, B / Bilka, T / Bobrov, A / Borah, J /

Bozek, A / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Chang, P / Chekelian, V / Chen, A / Cheon, B G / Chilikin, K / Cho, H E / Cho, K / Cho, S-J / Choi, S-K / Choi, Y / Cinabro, D / Cunliffe, S / Czank, T / Das, S / De Nardo, G / De Pietro, G / Dhamija, R / Di Capua, F / Dingfelder, J / Doležal, Z / Dong, T V / Ferber, T / Fulsom, B G / Garg, R / Gaur, V / Gabyshev, N / Giri, A / Goldenzweig, P / Graziani, E / Gu, T / Guan, Y / Gudkova, K / Hadjivasiliou, C / Halder, S / Hartbrich, O / Hayasaka, K / Hayashii, H / Higuchi, T / Hou, W-S / Hsu, C-L / Iijima, T / Inami, K / Ishikawa, A / Itoh, R / Iwasaki, M / Iwasaki, Y / Jacobs, W W / Jang, E-J / Jia, S / Jin, Y / Kaliyar, A B / Kang, K H / Kim, C H / Kim, D Y / Kim, K-H / Kim, Y-K / Kinoshita, K / Kodyš, P / Konno, T / Korobov, A / Korpar, S / Kovalenko, E / Križan, P / Krokovny, P / Kumar, M / Kumar, R / Kumara, K / Kuzmin, A / Kwon, Y-J / Lam, T / Lange, J S / Laurenza, M / Lee, S C / Levit, D / Li, J / Li, L K / Li, Y B / Li Gioi, L / Libby, J / Lieret, K / Liventsev, D / Martini, A / Masuda, M / Matvienko, D / Meier, F / Merola, M / Metzner, F / Mizuk, R / Mohanty, G B / Moon, T J / Mrvar, M / Mussa, R / Nakao, M / Natochii, A / Nayak, L / Nisar, N K / Nishida, S / Ogawa, S / Pakhlova, G / Pang, T / Pardi, S / Park, H / Park, S-H / Passeri, A / Patra, S / Paul, S / Pedlar, T K / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rostomyan, A / Rout, N / Russo, G / Sahoo, D / Sakai, Y / Sandilya, S / Sangal, A / Santelj, L / Sanuki, T / Savinov, V / Schnell, G / Schueler, J / Schwanda, C / Seino, Y / Senyo, K / Sevior, M E / Shapkin, M / Sharma, C / Shen, C P / Shiu, J-G / Singh, J B / Sokolov, A / Solovieva, E / Starič, M / Stottler, Z S / Strube, J F / Sumihama, M / Sumisawa, K / Sutcliffe, W / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Trabelsi, K / Uglov, T / Unno, Y / Uno, K / Uno, S / Urquijo, P / van Tonder, R / Varner, G / Varvell, K E / Vinokurova, A / Vossen, A / Waheed, E / Wang, C H / Wang, X L / Watanabe, M / Watanuki, S / Won, E / Yabsley, B D / Yan, W / Yang, S B / Ye, H / Yelton, J / Zhai, Y / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 130, Issue 18, Page(s) 181804

Abstract: We study B^{+}→π^{+}π^{0}π^{0} using 711 fb^{-1} of data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure an inclusive branching fraction of (19.0±1.5±1.4)×10^{-6} and an inclusive CP ...

Abstract	We study B^{+}→π^{+}π^{0}π^{0} using 711 fb^{-1} of data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We measure an inclusive branching fraction of (19.0±1.5±1.4)×10^{-6} and an inclusive CP asymmetry of (9.2±6.8±0.7)%, where the first uncertainties are statistical and the second are systematic, and a B^{+}→ρ(770)^{+}π^{0} branching fraction of (11.2±1.1±0.9_{-1.6}^{+0.8})×10^{-6}, where the third uncertainty is due to possible interference with B^{+}→ρ(1450)^{+}π^{0}. We present the first observation of a structure around 1 GeV/c^{2} in the π^{0}π^{0} mass spectrum, with a significance of 6.4σ, and measure a branching fraction to be (6.9±0.9±0.6)×10^{-6}. We also report a measurement of local CP asymmetry in this structure.
Language	English
Publishing date	2023-03-03
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.130.181804
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Article ; Online: Search for a Heavy Neutrino in τ Decays at Belle.

Liventsev, D / Adachi, I / Aihara, H / Al Said, S / Asner, D M / Atmacan, H / Ayad, R / Babu, V / Banerjee, Sw / Bauer, M / Behera, P / Belous, K / Bennett, J / Bessner, M / Bilka, T / Biswas, D / Bodrov, D / Bonvicini, G / Borah, J /

Bozek, A / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Chen, A / Cheon, B G / Cho, H E / Cho, K / Cho, S-J / Choi, S-K / Choi, Y / Choudhury, S / Cinabro, D / Das, S / De Nardo, G / De Pietro, G / Dhamija, R / Di Capua, F / Doležal, Z / Dong, T V / Dossett, D / Epifanov, D / Ferber, T / Ferlewicz, D / Fulsom, B G / Garg, R / Gaur, V / Giri, A / Goldenzweig, P / Graziani, E / Gu, T / Gudkova, K / Hadjivasiliou, C / Han, X / Hara, T / Hayasaka, K / Hayashii, H / Hedges, M T / Herrmann, D / Hernández Villanueva, M / Hsu, C-L / Inami, K / Ipsita, N / Ishikawa, A / Itoh, R / Iwasaki, M / Jacobs, W W / Jang, E-J / Jia, S / Jin, Y / Kaliyar, A B / Kang, K H / Kawasaki, T / Kiesling, C / Kim, C H / Kim, D Y / Kim, K-H / Kim, Y-K / Kodyš, P / Korobov, A / Korpar, S / Kovalenko, E / Križan, P / Krokovny, P / Kumar, M / Kumar, R / Kumara, K / Kwon, Y-J / Lam, T / Lange, J S / Lee, S C / Lewis, P / Li, L K / Li, Y / Li Gioi, L / Libby, J / Lieret, K / Lin, Y-R / Luo, T / Matsuda, T / Matvienko, D / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mizuk, R / Mohanty, G B / Mussa, R / Nakamura, I / Nakano, T / Nakao, M / Natkaniec, Z / Natochii, A / Nayak, L / Nayak, M / Nisar, N K / Nishida, S / Ogawa, S / Ono, H / Oskin, P / Pakhlov, P / Pakhlova, G / Pardi, S / Park, H / Park, J / Passeri, A / Patra, S / Paul, S / Pedlar, T K / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rostomyan, A / Rout, N / Russo, G / Sandilya, S / Sangal, A / Santelj, L / Savinov, V / Schnell, G / Schueler, J / Schwanda, C / Seino, Y / Senyo, K / Sevior, M E / Shapkin, M / Sharma, C / Shen, C P / Shiu, J-G / Shwartz, B / Simon, F / Sokolov, A / Solovieva, E / Starič, M / Sumihama, M / Sumiyoshi, T / Sutcliffe, W / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Uchida, M / Uehara, S / Uno, S / Usov, Y / van Tonder, R / Varner, G / Varvell, K E / Vinokurova, A / Wang, M-Z / Wang, X L / Watanabe, M / Watanuki, S / Werbycka, O / Won, E / Xu, X / Yabsley, B D / Yan, W / Yang, S B / Yelton, J / Yin, J H / Yuan, C Z / Yuan, L / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 131, Issue 21, Page(s) 211802

Abstract: We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}ℓ^{∓}, ℓ=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} ... ...

Abstract	We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}ℓ^{∓}, ℓ=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected with the Belle detector at the KEKB asymmetric energy e^{+}e^{-} collider, which contains 912×10^{6} ττ pairs. We observe no significant signal and set 95% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional standard model left-handed neutrinos in the mass range 0.2-1.6 GeV/c^{2}. This is the first study of a mixed couplings of heavy neutrinos to τ leptons and light-flavor leptons.
Language	English
Publishing date	2023-09-29
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.131.211802
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Article ; Online: Evidence of a New Excited Charmed Baryon Decaying to Σ_{c}(2455)^{0,++}π^{±}.

Li, Y B / Shen, C P / Adachi, I / Aihara, H / Asner, D M / Atmacan, H / Aushev, T / Ayad, R / Babu, V / Bahinipati, S / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhardwaj, V / Bhuyan, B / Bilka, T / Bodrov, D / Borah, J /

Bozek, A / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Chang, P / Cheon, B G / Chilikin, K / Cho, H E / Cho, K / Cho, S-J / Choi, S-K / Choi, Y / Choudhury, S / Cinabro, D / Das, S / De Pietro, G / Dhamija, R / Di Capua, F / Dingfelder, J / Doležal, Z / Dong, T V / Dossett, D / Epifanov, D / Fulsom, B G / Garg, R / Gaur, V / Garmash, A / Giri, A / Goldenzweig, P / Graziani, E / Gu, T / Guan, Y / Gudkova, K / Hadjivasiliou, C / Hayasaka, K / Hayashii, H / Hou, W-S / Hsu, C-L / Iijima, T / Inami, K / Ipsita, N / Ishikawa, A / Itoh, R / Iwasaki, M / Iwasaki, Y / Jacobs, W W / Jang, E-J / Ji, Q P / Jia, S / Jin, Y / Joo, K K / Karyan, G / Kawasaki, T / Kichimi, H / Kiesling, C / Kim, C H / Kim, D Y / Kim, K-H / Kim, Y-K / Kindo, H / Kinoshita, K / Kodyš, P / Konno, T / Korobov, A / Korpar, S / Kovalenko, E / Križan, P / Krokovny, P / Kumar, M / Kumar, R / Kumara, K / Kwon, Y-J / Lam, T / Lange, J S / Laurenza, M / Lee, S C / Li, C H / Li, J / Li, L K / Li, Y / Li Gioi, L / Libby, J / Lieret, K / Liventsev, D / Masuda, M / Matsuda, T / Matvienko, D / Maurya, S K / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mizuk, R / Mohanty, G B / Nakamura, I / Nakao, M / Natkaniec, Z / Natochii, A / Nayak, L / Niiyama, M / Nisar, N K / Nishida, S / Ogawa, S / Ono, H / Oskin, P / Pakhlov, P / Pakhlova, G / Pardi, S / Park, H / Park, S-H / Patra, S / Paul, S / Pedlar, T K / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rout, N / Russo, G / Sandilya, S / Santelj, L / Savinov, V / Schnell, G / Schueler, J / Schwanda, C / Seino, Y / Senyo, K / Sevior, M E / Shapkin, M / Sharma, C / Shiu, J-G / Singh, J B / Sokolov, A / Solovieva, E / Starič, M / Stottler, Z S / Sumihama, M / Sumiyoshi, T / Sutcliffe, W / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Trabelsi, K / Tsuboyama, T / Uchida, M / Uglov, T / Unno, Y / Uno, S / Usov, Y / van Tonder, R / Varner, G / Varvell, K E / Waheed, E / Wang, E / Wang, M-Z / Watanabe, M / Watanuki, S / Werbycka, O / Wiechczynski, J / Won, E / Yabsley, B D / Yan, W / Yang, S B / Yelton, J / Yin, J H / Yuan, C Z / Yusa, Y / Zhai, Y / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 130, Issue 3, Page(s) 31901

Abstract: We present the study of B[over ¯]^{0}→Σ_{c}(2455)^{0,++}π^{±}p[over ¯] decays based on 772×10^{6} BB[over ¯] events collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The Σ_{c}(2455)^{0,++} candidates are reconstructed ... ...

Abstract	We present the study of B[over ¯]^{0}→Σ_{c}(2455)^{0,++}π^{±}p[over ¯] decays based on 772×10^{6} BB[over ¯] events collected with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. The Σ_{c}(2455)^{0,++} candidates are reconstructed via their decay to Λ_{c}^{+}π^{∓} and Λ_{c}^{+} decays to pK^{-}π^{+}, pK_{S}^{0}, and Λπ^{+} final states. The corresponding branching fractions are measured to be B(B[over ¯]^{0}→Σ_{c}(2455)^{0}π^{+}p[over ¯])=(1.09±0.06±0.07)×10^{-4} and B(B[over ¯]^{0}→Σ_{c}(2455)^{++}π^{-}p[over ¯])=(1.84±0.11±0.12)×10^{-4}, which are consistent with the world average values with improved precision. A new structure is found in the M_{Σ_{c}(2455)^{0,++}π^{±}} spectrum with a significance of 4.2σ including systematic uncertainty. The structure is possibly an excited Λ_{c}^{+} and is tentatively named Λ_{c}(2910)^{+}. Its mass and width are measured to be (2913.8±5.6±3.8) MeV/c^{2} and (51.8±20.0±18.8) MeV, respectively. The products of branching fractions for the Λ_{c}(2910)^{+} are measured to be B(B[over ¯]^{0}→Λ_{c}(2910)^{+}p[over ¯])×B(Λ_{c}(2910)^{+}→Σ_{c}(2455)^{0}π^{+})=(9.5±3.6±1.6)×10^{-6} and B(B[over ¯]^{0}→Λ_{c}(2910)^{+}p[over ¯])×B(Λ_{c}(2910)^{+}→Σ_{c}(2455)^{++}π^{-})=(1.24±0.35±0.10)×10^{-5}. Here, the first and second uncertainties are statistical and systematic, respectively.
Language	English
Publishing date	2023-02-10
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.130.031901
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First Observation of Λπ^{+} and Λπ^{-} Signals near the K[over ¯]N(I=1) Mass Threshold in Λ_{c}^{+}→Λπ^{+}π^{+}π^{-} Decay.

Ma, Y / Yelton, J / Tanida, K / Adachi, I / Ahn, J K / Aihara, H / Al Said, S / Asner, D M / Atmacan, H / Aushev, T / Ayad, R / Babu, V / Bahinipati, S / Banerjee, Sw / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhuyan, B /

Bilka, T / Biswas, D / Bobrov, A / Bodrov, D / Borah, J / Bozek, A / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Chen, A / Cheon, B G / Chilikin, K / Cho, H E / Cho, K / Cho, S-J / Choi, S-K / Choi, Y / Choudhury, S / Cinabro, D / Das, S / De Nardo, G / De Pietro, G / Dhamija, R / Di Capua, F / Dingfelder, J / Doležal, Z / Dong, T V / Epifanov, D / Ferber, T / Ferlewicz, D / Fulsom, B G / Garg, R / Gaur, V / Garmash, A / Giri, A / Goldenzweig, P / Golob, B / Graziani, E / Gudkova, K / Hadjivasiliou, C / Halder, S / Hayasaka, K / Hayashii, H / Hedges, M T / Hou, W-S / Hsu, C-L / Inami, K / Ipsita, N / Ishikawa, A / Itoh, R / Iwasaki, M / Jacobs, W W / Jang, E-J / Jia, S / Jin, Y / Kaliyar, A B / Kang, K H / Kawasaki, T / Kiesling, C / Kim, C H / Kim, D Y / Kim, Y-K / Kinoshita, K / Kodyš, P / Korobov, A / Korpar, S / Kovalenko, E / Križan, P / Krokovny, P / Kumar, R / Kumara, K / Kwon, Y-J / Lam, T / Lange, J S / Lee, S C / Lewis, P / Li, L K / Li, Y / Li Gioi, L / Libby, J / Lieret, K / Lin, Y-R / Liventsev, D / Luo, T / Masuda, M / Matsuda, T / Matvienko, D / Maurya, S K / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mohanty, G B / Mussa, R / Nakamura, I / Nakano, T / Nakao, M / Natkaniec, Z / Natochii, A / Nayak, L / Nayak, M / Nisar, N K / Nishida, S / Ogawa, S / Ono, H / Oskin, P / Pakhlov, P / Pakhlova, G / Pardi, S / Park, H / Park, J / Patra, S / Paul, S / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rostomyan, A / Rout, N / Russo, G / Sandilya, S / Santelj, L / Savinov, V / Schnell, G / Schueler, J / Schwanda, C / Seino, Y / Senyo, K / Sevior, M E / Shan, W / Shapkin, M / Sharma, C / Shen, C P / Shiu, J-G / Simon, F / Sokolov, A / Solovieva, E / Starič, M / Sumihama, M / Sumiyoshi, T / Sutcliffe, W / Takizawa, M / Tamponi, U / Tenchini, F / Uchida, M / Uehara, S / Uglov, T / Unno, Y / Uno, K / Uno, S / Urquijo, P / Usov, Y / Vahsen, S E / van Tonder, R / Varner, G / Vinokurova, A / Vossen, A / Wang, D / Wang, M-Z / Watanabe, M / Watanuki, S / Werbycka, O / Won, E / Xu, X / Yabsley, B D / Yan, W / Yang, S B / Yin, J H / Yuan, C Z / Yuan, L / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 130, Issue 15, Page(s) 151903

Abstract: Using the data sample of 980 fb^{-1} collected with the Belle detector operating at the KEKB asymmetric-energy e^{+}e^{-} collider, we present the results of an investigation of the Λπ^{+} and Λπ^{-} invariant mass distributions looking for substructure ...

Abstract	Using the data sample of 980 fb^{-1} collected with the Belle detector operating at the KEKB asymmetric-energy e^{+}e^{-} collider, we present the results of an investigation of the Λπ^{+} and Λπ^{-} invariant mass distributions looking for substructure in the decay Λ_{c}^{+}→Λπ^{+}π^{+}π^{-}. We find a significant signal in each mass distribution. When interpreted as resonances, we find for the Λπ^{+} (Λπ^{-}) combination a mass of 1434.3±0.6(stat)±0.9(syst) MeV/c^{2} [1438.5±0.9(stat)±2.5(syst) MeV/c^{2}], an intrinsic width of 11.5±2.8(stat)±5.3(syst) MeV/c^{2} [33.0±7.5(stat)±23.6(syst) MeV/c^{2}] with a significance of 7.5σ (6.2σ). As these two signals are very close to the K[over ¯]N threshold, we also investigate the possibility of a K[over ¯]N cusp, and find that we cannot discriminate between these two interpretations due to the limited size of the data sample.
Language	English
Publishing date	2023-04-28
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.130.151903
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First Measurement of the Michel Parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} Decay at Belle.

Bodrov, D / Pakhlov, P / Adachi, I / Aihara, H / Said, S Al / Asner, D M / Atmacan, H / Aushev, T / Ayad, R / Babu, V / Banerjee, Sw / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhuyan, B / Bilka, T / Biswas, D / Bobrov, A /

Bondar, A / Borah, J / Bozek, A / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Cheon, B G / Chilikin, K / Cho, H E / Cho, K / Cho, S-J / Choi, S-K / Choi, Y / Choudhury, S / Cinabro, D / Das, S / De Nardo, G / De Pietro, G / Dhamija, R / Di Capua, F / Dingfelder, J / Doležal, Z / Dong, T V / Epifanov, D / Ferber, T / Ferlewicz, D / Fulsom, B G / Gaur, V / Garmash, A / Giri, A / Goldenzweig, P / Graziani, E / Greenwald, D / Gu, T / Guan, Y / Gudkova, K / Hadjivasiliou, C / Halder, S / Hayasaka, K / Hayashii, H / Hedges, M T / Herrmann, D / Hou, W-S / Hsu, C-L / Iijima, T / Inami, K / Ipsita, N / Ishikawa, A / Itoh, R / Iwasaki, M / Jacobs, W W / Jang, E-J / Ji, Q P / Jia, S / Jin, Y / Joo, K K / Kalita, D / Kaliyar, A B / Kawasaki, T / Kiesling, C / Kim, C H / Kim, D Y / Kim, K-H / Kim, Y-K / Kindo, H / Kinoshita, K / Kodyš, P / Korpar, S / Križan, P / Krokovny, P / Kuhr, T / Kumar, M / Kumar, R / Kumara, K / Kwon, Y-J / Lange, J S / Lee, S C / Li, J / Li, L K / Libby, J / Lieret, K / Lin, Y-R / Liventsev, D / Luo, T / Ma, Y / Masuda, M / Matsuda, T / Maurya, S K / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mizuk, R / Mohanty, G B / Mussa, R / Nakao, M / Narwal, D / Natkaniec, Z / Natochii, A / Nayak, L / Nayak, M / Nisar, N K / Nishida, S / Ogawa, S / Oskin, P / Pakhlova, G / Pardi, S / Park, H / Park, J / Park, S-H / Passeri, A / Patra, S / Paul, S / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rabusov, A / Rout, N / Russo, G / Sandilya, S / Sangal, A / Santelj, L / Savinov, V / Schnell, G / Schwanda, C / Seino, Y / Senyo, K / Shan, W / Shapkin, M / Sharma, C / Shiu, J-G / Singh, J B / Sokolov, A / Solovieva, E / Starič, M / Stottler, Z S / Sumihama, M / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Tiwary, R / Trabelsi, K / Uchida, M / Uglov, T / Unno, Y / Uno, K / Uno, S / Vahsen, S E / Varner, G / Vinokurova, A / Vossen, A / Wang, D / Wang, E / Wang, M-Z / Watanuki, S / Werbycka, O / Xu, X / Yabsley, B D / Yan, W / Yang, S B / Yelton, J / Yin, J H / Yuan, C Z / Yusa, Y / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 131, Issue 2, Page(s) 21801

Abstract: We report the first measurement of the Michel parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decay with a new method proposed just recently. The measurement is based on the reconstruction of the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} events with subsequent ... ...

Abstract	We report the first measurement of the Michel parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decay with a new method proposed just recently. The measurement is based on the reconstruction of the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} events with subsequent muon decay in flight in the Belle central drift chamber. The analyzed data sample of 988 fb^{-1} collected by the Belle detector corresponds to approximately 912×10^{6} τ^{+}τ^{-} pairs. We measure ξ^{'}=0.22±0.94(stat)±0.42(syst), which is in agreement with the standard model prediction of ξ^{'}=1. Statistical uncertainty dominates in this study, being a limiting factor, while systematic uncertainty is well under control. Our analysis proved the practicability of this promising method and its prospects for further precise measurement in future experiments.
Language	English
Publishing date	2023-07-28
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.131.021801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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