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  1. Book ; Online: Lepton flavour universality tests in $b \to c l \nu$ decays at the LHCb experiment

    Mathad, Abhijit

    2023  

    Abstract: Semileptonic charged current $b \to c l^- \overline{\nu}_l$ decays offer a compelling avenue to probe the limits of the Standard Model and investigate lepton flavor universality (LFU). While the SM maintains flavor universality, new physics models can ... ...

    Abstract Semileptonic charged current $b \to c l^- \overline{\nu}_l$ decays offer a compelling avenue to probe the limits of the Standard Model and investigate lepton flavor universality (LFU). While the SM maintains flavor universality, new physics models can introduce interactions that violate this universality, particularly for decays involving third-generation quarks and leptons. An enticing observable to test LFU is the ratio of branching fractions of $b \to c \tau^- \overline{\nu}_\tau$ and $b \to c \mu^- \overline{\nu}_\mu$ decays. Recently, the LHCb experiment measured this ratio using $\overline{B} \to D^{(*)} l^- \overline{\nu}_l$ decays. We discuss these results in this proceedings of the 57th Rencontres de Moriond on Electroweak Interactions and Unified Theories.

    Comment: contribution to the 2023 Electroweak session of the 57th Rencontres de Moriond. 6 pages and 5 figures
    Keywords High Energy Physics - Experiment
    Subject code 612
    Publishing date 2023-05-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: High frequency properties of a planar ion trap fabricated on a chip.

    Uribe, A J / Cridland Mathad, A / Lacy, J H / Pinder, J / Willetts, R / Verdú, J

    The Review of scientific instruments

    2022  Volume 93, Issue 8, Page(s) 83202

    Abstract: We report on the measurement of the high frequency properties of a planar Penning ion trap fabricated on a chip. Two types of chips have been measured: the first manufactured by photolithographic metal deposition on a p-doped silicon substrate and the ... ...

    Abstract We report on the measurement of the high frequency properties of a planar Penning ion trap fabricated on a chip. Two types of chips have been measured: the first manufactured by photolithographic metal deposition on a p-doped silicon substrate and the second made with printed circuit board technology on an alumina substrate. The input capacitances and the admittances between the different trap's electrodes play a critical role in the electronic detection of the trapped particles. The measured input capacitances of the photolithographic chip amount to 65-76 pF, while the values for the printed circuit board chips are in the range of 3-5 pF. The latter are small enough for detecting non-destructively a single trapped electron or ion with a specifically tuned LC resonator. We have also measured a mutual capacitance of ∼85 fF between two of the trap's electrodes in the printed circuit board chip. This enables the detection of single, or very few, trapped particles in a broader range of charge-to-mass ratios with a simple resistor on the chip. We provide analytic calculations of the capacitances and discuss their origin and possible further reduction.
    Language English
    Publishing date 2022-08-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0091745
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Planar, strong magnetic field source for a chip ion trap.

    Pinder, Jonathan / Lacy, John H / Willetts, Ryan / Cridland Mathad, April / Uribe, Alberto / Verdú, José

    The Review of scientific instruments

    2020  Volume 91, Issue 10, Page(s) 103201

    Abstract: We present a planar, scalable magnetic field source, originally conceived for a chip ion trap. It consists of two symmetric sections, each with several independent currents arranged in coplanar, concentric rectangular loops. The currents allow for tuning ...

    Abstract We present a planar, scalable magnetic field source, originally conceived for a chip ion trap. It consists of two symmetric sections, each with several independent currents arranged in coplanar, concentric rectangular loops. The currents allow for tuning the strength of the field and its lowest-order derivatives at one discretional position along the source's vertical symmetry axis, a few mm above its surface. We describe the construction and calibration of the device and the cryogenic setup. The two most important current configurations for a Penning ion trap, the homogeneous field and the magnetic bottle, are investigated experimentally. Homogeneous fields around 0.5 T are routinely reached. We discuss the maximum attainable field, and we briefly describe ongoing further developments aiming at homogeneous fields well above 1 T.
    Language English
    Publishing date 2020-11-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0024735
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: A general effective field theory description of $b \to s l^+ l^-$ lepton universality ratios

    Isidori, Gino / Lancierini, Davide / Mathad, Abhijit / Owen, Patrick / Serra, Nicola / Coutinho, Rafael Silva

    2021  

    Abstract: We construct an expression for a general lepton flavour universality (LFU) ratio, $R_{X}$, in $b\to s l^+ l^-$ decays in terms of a series of hadronic quantities which can be treated as nuisance parameters. This expression allows to include any LFU ratio ...

    Abstract We construct an expression for a general lepton flavour universality (LFU) ratio, $R_{X}$, in $b\to s l^+ l^-$ decays in terms of a series of hadronic quantities which can be treated as nuisance parameters. This expression allows to include any LFU ratio in global fits of $b\to s l^+ l^-$ short-distance parameters, even in the absence of a precise knowledge of the corresponding hadronic structure. The absence of sizeable LFU violation and the approximate left-handed structure of the Standard Model amplitude imply that only a very limited set of hadronic parameters hamper the sensitivity of $R_X$ to a possible LFU violation of short-distance origin. A global $b\to s l^+ l^-$ combination is performed including the measurement of $R_{pK}$ for the first time, resulting in a significance of new physics of $4.2\,\sigma$. In light of this, we evaluate the impact on the global significance of new physics using a set of experimentally promising non-exclusive $R_X$ measurements that LHCb can perform, and find that they can significantly increase the discovery potential of the experiment.

    Comment: 7 pages, 4 figures
    Keywords High Energy Physics - Phenomenology ; High Energy Physics - Experiment
    Subject code 612
    Publishing date 2021-10-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: Efficient description of experimental effects in amplitude analyses

    Mathad, Abhijit / O'Hanlon, Daniel / Poluektov, Anton / Rabadan, Raul

    2019  

    Abstract: Amplitude analysis is a powerful technique to study hadron decays. A significant complication in these analyses is the treatment of instrumental effects, such as background and selection efficiency variations, in the multidimensional kinematic phase ... ...

    Abstract Amplitude analysis is a powerful technique to study hadron decays. A significant complication in these analyses is the treatment of instrumental effects, such as background and selection efficiency variations, in the multidimensional kinematic phase space. This paper reviews conventional methods to estimate efficiency and background distributions and outlines the methods of density estimation using Gaussian processes and artificial neural networks. Such techniques see widespread use elsewhere, but have not gained popularity in use for amplitude analyses. Finally, novel applications of these models are proposed, to estimate background density in the signal region from the sidebands in multiple dimensions, and a more general method for model-assisted density estimation using artificial neural networks.

    Comment: 34 pages, 15 figures, 4 tables. Version submitted to JINST
    Keywords Physics - Data Analysis ; Statistics and Probability ; High Energy Physics - Experiment
    Subject code 621
    Publishing date 2019-02-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Observation of the effect of gravity on the motion of antimatter.

    Anderson, E K / Baker, C J / Bertsche, W / Bhatt, N M / Bonomi, G / Capra, A / Carli, I / Cesar, C L / Charlton, M / Christensen, A / Collister, R / Cridland Mathad, A / Duque Quiceno, D / Eriksson, S / Evans, A / Evetts, N / Fabbri, S / Fajans, J / Ferwerda, A /
    Friesen, T / Fujiwara, M C / Gill, D R / Golino, L M / Gomes Gonçalves, M B / Grandemange, P / Granum, P / Hangst, J S / Hayden, M E / Hodgkinson, D / Hunter, E D / Isaac, C A / Jimenez, A J U / Johnson, M A / Jones, J M / Jones, S A / Jonsell, S / Khramov, A / Madsen, N / Martin, L / Massacret, N / Maxwell, D / McKenna, J T K / Menary, S / Momose, T / Mostamand, M / Mullan, P S / Nauta, J / Olchanski, K / Oliveira, A N / Peszka, J / Powell, A / Rasmussen, C Ø / Robicheaux, F / Sacramento, R L / Sameed, M / Sarid, E / Schoonwater, J / Silveira, D M / Singh, J / Smith, G / So, C / Stracka, S / Stutter, G / Tharp, T D / Thompson, K A / Thompson, R I / Thorpe-Woods, E / Torkzaban, C / Urioni, M / Woosaree, P / Wurtele, J S

    Nature

    2023  Volume 621, Issue 7980, Page(s) 716–722

    Abstract: Einstein's general theory of relativity from ... ...

    Abstract Einstein's general theory of relativity from 1915
    Language English
    Publishing date 2023-09-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-023-06527-1
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production.

    Baker, C J / Bertsche, W / Capra, A / Cesar, C L / Charlton, M / Mathad, A Cridland / Eriksson, S / Evans, A / Evetts, N / Fabbri, S / Fajans, J / Friesen, T / Fujiwara, M C / Grandemange, P / Granum, P / Hangst, J S / Hayden, M E / Hodgkinson, D / Isaac, C A /
    Johnson, M A / Jones, J M / Jones, S A / Jonsell, S / Kurchaninov, L / Madsen, N / Maxwell, D / McKenna, J T K / Menary, S / Momose, T / Mullan, P / Olchanski, K / Olin, A / Peszka, J / Powell, A / Pusa, P / Rasmussen, C Ø / Robicheaux, F / Sacramento, R L / Sameed, M / Sarid, E / Silveira, D M / Stutter, G / So, C / Tharp, T D / Thompson, R I / van der Werf, D P / Wurtele, J S

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 6139

    Abstract: The positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituent of antihydrogen, the only long-lived ... ...

    Abstract The positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituent of antihydrogen, the only long-lived neutral antimatter bound state that can currently be synthesized at low energy, presenting a prominent system for testing fundamental symmetries with high precision. Here, we report on the use of laser cooled Be
    Language English
    Publishing date 2021-10-22
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-26086-1
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  8. Article ; Online: Laser cooling of antihydrogen atoms.

    Baker, C J / Bertsche, W / Capra, A / Carruth, C / Cesar, C L / Charlton, M / Christensen, A / Collister, R / Mathad, A Cridland / Eriksson, S / Evans, A / Evetts, N / Fajans, J / Friesen, T / Fujiwara, M C / Gill, D R / Grandemange, P / Granum, P / Hangst, J S /
    Hardy, W N / Hayden, M E / Hodgkinson, D / Hunter, E / Isaac, C A / Johnson, M A / Jones, J M / Jones, S A / Jonsell, S / Khramov, A / Knapp, P / Kurchaninov, L / Madsen, N / Maxwell, D / McKenna, J T K / Menary, S / Michan, J M / Momose, T / Mullan, P S / Munich, J J / Olchanski, K / Olin, A / Peszka, J / Powell, A / Pusa, P / Rasmussen, C Ø / Robicheaux, F / Sacramento, R L / Sameed, M / Sarid, E / Silveira, D M / Starko, D M / So, C / Stutter, G / Tharp, T D / Thibeault, A / Thompson, R I / van der Werf, D P / Wurtele, J S

    Nature

    2021  Volume 592, Issue 7852, Page(s) 35–42

    Abstract: The photon-the quantum excitation of the electromagnetic field-is massless but carries momentum. A photon can therefore exert a force on an object upon ... ...

    Abstract The photon-the quantum excitation of the electromagnetic field-is massless but carries momentum. A photon can therefore exert a force on an object upon collision
    Language English
    Publishing date 2021-03-31
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-021-03289-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Measurement of CP Violation in B^{0}→ψ(→ℓ^{+}ℓ^{-})K_{S}^{0}(→π^{+}π^{-}) Decays.

    Aaij, R / Abdelmotteleb, A S W / Abellan Beteta, C / Abudinén, F / Ackernley, T / Adeva, B / Adinolfi, M / Adlarson, P / Afsharnia, H / Agapopoulou, C / Aidala, C A / Ajaltouni, Z / Akar, S / Akiba, K / Albicocco, P / Albrecht, J / Alessio, F / Alexander, M / Alfonso Albero, A /
    Aliouche, Z / Alvarez Cartelle, P / Amalric, R / Amato, S / Amey, J L / Amhis, Y / An, L / Anderlini, L / Andersson, M / Andreianov, A / Andreola, P / Andreotti, M / Andreou, D / Ao, D / Archilli, F / Artamonov, A / Artuso, M / Aslanides, E / Atzeni, M / Audurier, B / Bacher, D / Bachiller Perea, I / Bachmann, S / Bachmayer, M / Back, J J / Bailly-Reyre, A / Baladron Rodriguez, P / Balagura, V / Baldini, W / Baptista de Souza Leite, J / Barbetti, M / Barbosa, I R / Barlow, R J / Barsuk, S / Barter, W / Bartolini, M / Baryshnikov, F / Basels, J M / Bassi, G / Batsukh, B / Battig, A / Bay, A / Beck, A / Becker, M / Bedeschi, F / Bediaga, I B / Beiter, A / Belin, S / Bellee, V / Belous, K / Belov, I / Belyaev, I / Benane, G / Bencivenni, G / Ben-Haim, E / Berezhnoy, A / Bernet, R / Bernet Andres, S / Berninghoff, D / Bernstein, H C / Bertella, C / Bertolin, A / Betancourt, C / Betti, F / Bex, J / Bezshyiko, Ia / Bhom, J / Bian, L / Bieker, M S / Biesuz, N V / Billoir, P / Biolchini, A / Birch, M / Bishop, F C R / Bitadze, A / Bizzeti, A / Blago, M P / Blake, T / Blanc, F / Blank, J E / Blusk, S / Bobulska, D / Bocharnikov, V / Boelhauve, J A / Boente Garcia, O / Boettcher, T / Bohare, A / Boldyrev, A / Bolognani, C S / Bolzonella, R / Bondar, N / Borgato, F / Borghi, S / Borsato, M / Borsuk, J T / Bouchiba, S A / Bowcock, T J V / Boyer, A / Bozzi, C / Bradley, M J / Braun, S / Brea Rodriguez, A / Breer, N / Brodzicka, J / Brossa Gonzalo, A / Brown, J / Brundu, D / Buonaura, A / Buonincontri, L / Burke, A T / Burr, C / Bursche, A / Butkevich, A / Butter, J S / Buytaert, J / Byczynski, W / Cadeddu, S / Cai, H / Calabrese, R / Calefice, L / Cali, S / Calvi, M / Calvo Gomez, M / Cambon Bouzas, J / Campana, P / Campora Perez, D H / Campoverde Quezada, A F / Capelli, S / Capriotti, L / Carbone, A / Carcedo Salgado, L / Cardinale, R / Cardini, A / Carniti, P / Carus, L / Casais Vidal, A / Caspary, R / Casse, G / Cattaneo, M / Cavallero, G / Cavallini, V / Celani, S / Cerasoli, J / Cervenkov, D / Chadwick, A J / Chahrour, I / Chapman, M G / Charles, M / Charpentier, Ph / Chavez Barajas, C A / Chefdeville, M / Chen, C / Chen, S / Chernov, A / Chernyshenko, S / Chobanova, V / Cholak, S / Chrzaszcz, M / Chubykin, A / Chulikov, V / Ciambrone, P / Cicala, M F / Cid Vidal, X / Ciezarek, G / Cifra, P / Clarke, P E L / Clemencic, M / Cliff, H V / Closier, J / Cobbledick, J L / Cocha Toapaxi, C / Coco, V / Cogan, J / Cogneras, E / Cojocariu, L / Collins, P / Colombo, T / Comerma-Montells, A / Congedo, L / Contu, A / Cooke, N / Corredoira, I / Correia, A / Corti, G / Cottee Meldrum, J J / Couturier, B / Craik, D C / Cruz Torres, M / Currie, R / Da Silva, C L / Dadabaev, S / Dai, L / Dai, X / Dall'Occo, E / Dalseno, J / D'Ambrosio, C / Daniel, J / Danilina, A / d'Argent, P / Davidson, A / Davies, J E / Davis, A / De Aguiar Francisco, O / de Boer, J / De Bruyn, K / De Capua, S / De Cian, M / De Freitas Carneiro Da Graca, U / De Lucia, E / De Miranda, J M / De Paula, L / De Serio, M / De Simone, D / De Simone, P / De Vellis, F / de Vries, J A / Dean, C T / Debernardis, F / Decamp, D / Dedu, V / Del Buono, L / Delaney, B / Dembinski, H-P / Denysenko, V / Deschamps, O / Dettori, F / Dey, B / Di Nezza, P / Diachkov, I / Didenko, S / Ding, S / Dobishuk, V / Docheva, A D / Dolmatov, A / Dong, C / Donohoe, A M / Dordei, F / Dos Reis, A C / Douglas, L / Downes, A G / Duan, W / Duda, P / Dudek, M W / Dufour, L / Duk, V / Durante, P / Duras, M M / Durham, J M / Dutta, D / Dziurda, A / Dzyuba, A / Easo, S / Eckstein, E / Egede, U / Egorychev, A / Egorychev, V / Eirea Orro, C / Eisenhardt, S / Ejopu, E / Ek-In, S / Eklund, L / Elashri, M / Ellbracht, J / Ely, S / Ene, A / Epple, E / Escher, S / Eschle, J / Esen, S / Evans, T / Fabiano, F / Falcao, L N / Fan, Y / Fang, B / Fantini, L / Faria, M / Farmer, K / Farry, S / Fazzini, D / Felkowski, L / Feng, M / Feo, M / Fernandez Gomez, M / Fernez, A D / Ferrari, F / Ferreira Lopes, L / Ferreira Rodrigues, F / Ferreres Sole, S / Ferrillo, M / Ferro-Luzzi, M / Filippov, S / Fini, R A / Fiorini, M / Firlej, M / Fischer, K M / Fitzgerald, D S / Fitzpatrick, C / Fiutowski, T / Fleuret, F / Fontana, M / Fontanelli, F / Foreman, L F / Forty, R / Foulds-Holt, D / Franco Sevilla, M / Frank, M / Franzoso, E / Frau, G / Frei, C / Friday, D A / Frontini, L / Fu, J / Fuehring, Q / Fujii, Y / Fulghesu, T / Gabriel, E / Galati, G / Galati, M D / Gallas Torreira, A / Galli, D / Gambetta, S / Gandelman, M / Gandini, P / Gao, H / Gao, R / Gao, Y / Garau, M / Garcia Martin, L M / Garcia Moreno, P / García Pardiñas, J / Garcia Plana, B / Garcia Rosales, F A / Garrido, L / Gaspar, C / Geertsema, R E / Gerken, L L / Gersabeck, E / Gersabeck, M / Gershon, T / Giambastiani, L / Giasemis, F I / Gibson, V / Giemza, H K / Gilman, A L / Giovannetti, M / Gioventù, A / Gironella Gironell, P / Giugliano, C / Giza, M A / Gizdov, K / Gkougkousis, E L / Glaser, F C / Gligorov, V V / Göbel, C / Golobardes, E / Golubkov, D / Golutvin, A / Gomes, A / Gomez Fernandez, S / Goncalves Abrantes, F / Goncerz, M / Gong, G / Gooding, J A / Gorelov, I V / Gotti, C / Grabowski, J P / Granado Cardoso, L A / Graugés, E / Graverini, E / Grazette, L / Graziani, G / Grecu, A T / Greeven, L M / Grieser, N A / Grillo, L / Gromov, S / Gu, C / Guarise, M / Guittiere, M / Guliaeva, V / Günther, P A / Guseinov, A-K / Gushchin, E / Guz, Y / Gys, T / Hadavizadeh, T / Hadjivasiliou, C / Haefeli, G / Haen, C / Haimberger, J / Haines, S C / Hajheidari, M / Halewood-Leagas, T / Halvorsen, M M / Hamilton, P M / Hammerich, J / Han, Q / Han, X / Hansmann-Menzemer, S / Hao, L / Harnew, N / Harrison, T / Hartmann, M / Hasse, C / Hatch, M / He, J / Heijhoff, K / Hemmer, F / Henderson, C / Henderson, R D L / Hennequin, A M / Hennessy, K / Henry, L / Herd, J / Heuel, J / Hicheur, A / Hill, D / Hilton, M / Hollitt, S E / Horswill, J / Hou, R / Hou, Y / Howarth, N / Hu, J / Hu, W / Hu, X / Huang, W / Huang, X / Hulsbergen, W / Hunter, R J / Hushchyn, M / Hutchcroft, D / Ibis, P / Idzik, M / Ilin, D / Ilten, P / Inglessi, A / Iniukhin, A / Ishteev, A / Ivshin, K / Jacobsson, R / Jage, H / Jaimes Elles, S J / Jakobsen, S / Jans, E / Jashal, B K / Jawahery, A / Jevtic, V / Jiang, E / Jiang, X / Jiang, Y / Jiang, Y J / John, M / Johnson, D / Jones, C R / Jones, T P / Joshi, S / Jost, B / Jurik, N / Juszczak, I / Kaminaris, D / Kandybei, S / Kang, Y / Karacson, M / Karpenkov, D / Karpov, M / Kauniskangas, A M / Kautz, J W / Keizer, F / Keller, D M / Kenzie, M / Ketel, T / Khanji, B / Kharisova, A / Kholodenko, S / Khreich, G / Kirn, T / Kirsebom, V S / Kitouni, O / Klaver, S / Kleijne, N / Klimaszewski, K / Kmiec, M R / Koliiev, S / Kolk, L / Kondybayeva, A / Konoplyannikov, A / Kopciewicz, P / Kopecna, R / Koppenburg, P / Korolev, M / Kostiuk, I / Kot, O / Kotriakhova, S / Kozachuk, A / Kravchenko, P / Kravchuk, L / Kreps, M / Kretzschmar, S / Krokovny, P / Krupa, W / Krzemien, W / Kubat, J / Kubis, S / Kucewicz, W / Kucharczyk, M / Kudryavtsev, V / Kulikova, E / Kupsc, A / Kutsenko, B K / Lacarrere, D / Lafferty, G / Lai, A / Lampis, A / Lancierini, D / Landesa Gomez, C / Lane, J J / Lane, R / Langenbruch, C / Langer, J / Lantwin, O / Latham, T / Lazzari, F / Lazzeroni, C / Le Gac, R / Lee, S H / Lefèvre, R / Leflat, A / Legotin, S / Leroy, O / Lesiak, T / Leverington, B / Li, A / Li, H / Li, K / Li, L / Li, P / Li, P-R / Li, S / Li, T / Li, Y / Li, Z / Lian, Z / Liang, X / Lin, C / Lin, T / Lindner, R / Lisovskyi, V / Litvinov, R / Liu, G / Liu, H / Liu, K / Liu, Q / Liu, S / Liu, Y / Lobo Salvia, A / Loi, A / Lomba Castro, J / Long, T / Longstaff, I / Lopes, J H / Lopez Huertas, A / López Soliño, S / Lovell, G H / Lu, Y / Lucarelli, C / Lucchesi, D / Luchuk, S / Lucio Martinez, M / Lukashenko, V / Luo, Y / Lupato, A / Luppi, E / Lynch, K / Lyu, X-R / Ma, R / Maccolini, S / Machefert, F / Maciuc, F / Mackay, I / Macko, V / Madhan Mohan, L R / Madurai, M M / Maevskiy, A / Magdalinski, D / Maisuzenko, D / Majewski, M W / Malczewski, J J / Malde, S / Malecki, B / Malinin, A / Maltsev, T / Manca, G / Mancinelli, G / Mancuso, C / Manera Escalero, R / Manuzzi, D / Manzari, C A / Marangotto, D / Marchand, J F / Marconi, U / Mariani, S / Marin Benito, C / Marks, J / Marshall, A M / Marshall, P J / Martelli, G / Martellotti, G / Martinazzoli, L / Martinelli, M / Martinez Santos, D / Martinez Vidal, F / Massafferri, A / Materok, M / Matev, R / Mathad, A / Matiunin, V / Matteuzzi, C / Mattioli, K R / Mauri, A / Maurice, E / Mauricio, J / Mazurek, M / McCann, M / Mcconnell, L / McGrath, T H / McHugh, N T / McNab, A / McNulty, R / Meadows, B / Meier, G / Melnychuk, D / Merk, M / Merli, A / Meyer Garcia, L / Miao, D / Miao, H / Mikhasenko, M / Milanes, D A / Milovanovic, M / Minard, M-N / Minotti, A / Minucci, E / Miralles, T / Mitchell, S E / Mitreska, B / Mitzel, D S / Modak, A / Mödden, A / Mohammed, R A / Moise, R D / Mokhnenko, S / Mombächer, T / Monk, M / Monroy, I A / 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    Physical review letters

    2024  Volume 132, Issue 2, Page(s) 21801

    Abstract: A measurement of time-dependent CP violation in the decays of B^{0} and B[over ¯]^{0} mesons to the final states J/ψ(→μ^{+}μ^{-})K_{S}^{0}, ψ(2S)(→μ^{+}μ^{-})K_{S}^{0} and J/ψ(→e^{+}e^{-})K_{S}^{0} with K_{S}^{0}→π^{+}π^{-} is presented. The data ... ...

    Abstract A measurement of time-dependent CP violation in the decays of B^{0} and B[over ¯]^{0} mesons to the final states J/ψ(→μ^{+}μ^{-})K_{S}^{0}, ψ(2S)(→μ^{+}μ^{-})K_{S}^{0} and J/ψ(→e^{+}e^{-})K_{S}^{0} with K_{S}^{0}→π^{+}π^{-} is presented. The data correspond to an integrated luminosity of 6  fb^{-1} collected at a center-of-mass energy of sqrt[s]=13  TeV with the LHCb detector. The CP-violation parameters are measured to be S_{ψK_{S}^{0}}=0.717±0.013(stat)±0.008(syst) and C_{ψK_{S}^{0}}=0.008±0.012(stat)±0.003(syst). This measurement of S_{ψK_{S}^{0}} represents the most precise single measurement of the CKM angle β to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and a combination with the LHCb Run 1 measurements is performed.
    Language English
    Publishing date 2024-01-26
    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.132.021801
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Improved Measurement of CP Violation Parameters in B_{s}^{0}→J/ψK^{+}K^{-} Decays in the Vicinity of the ϕ(1020) Resonance.

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    Physical review letters

    2024  Volume 132, Issue 5, Page(s) 51802

    Abstract: The decay-time-dependent CP asymmetry in B_{s}^{0}→J/ψ(→μ^{+}μ^{-})K^{+}K^{-} decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6  fb^{-1}, collected with the LHCb detector at a center-of-mass energy of ... ...

    Abstract The decay-time-dependent CP asymmetry in B_{s}^{0}→J/ψ(→μ^{+}μ^{-})K^{+}K^{-} decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6  fb^{-1}, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 B_{s}^{0} signal decays with an invariant K^{+}K^{-} mass in the vicinity of the ϕ(1020) resonance, the CP-violating phase ϕ_{s} is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the B_{s}^{0}-B[over ¯]_{s}^{0} system, ΔΓ_{s}, and the difference of the average B_{s}^{0} and B^{0} meson decay widths, Γ_{s}-Γ_{d}. The values obtained are ϕ_{s}=-0.039±0.022±0.006  rad, ΔΓ_{s}=0.0845±0.0044±0.0024  ps^{-1}, and Γ_{s}-Γ_{d}=-0.0056_{-0.0015}^{+0.0013}±0.0014  ps^{-1}, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase ϕ_{s} is also measured independently for each polarization state of the K^{+}K^{-} system and shows no evidence for polarization dependence.
    Language English
    Publishing date 2024-02-16
    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.132.051802
    Database MEDical Literature Analysis and Retrieval System OnLINE

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