Precision Measurement of CP Violation and Branching Fractions in B^± → K_S⁰h^± (h = π, K) Decays and Search for the Rare Decay B_c^± → K_S⁰K^±

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Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Abudinen, F, Ackernley, T, Adefisoye, AA, Adeva, B, Adinolfi, M, Adlarson, P, Agapopoulou, C et al (show 1170 more authors) , Aidala, CA, Ajaltouni, Z, Akar, S, Akiba, K, Akthar, M, Albicocco, P, Albrecht, J, Aleksiejunas, R, Alessio, F, Cartelle, P Alvarez, Amalric, R, Amato, S, An, L, Anderlini, L, Andreola, P, Andreotti, M, Estrada, S Andres, Anelli, A, Ao, D, Arata, C, Archilli, F, Areg, Z, Argenton, M, Arguedas Cuendis, S, Arnone, L, Artamonov, A, Artuso, M, Aslanides, E, Da Silva, R Ataide, Atzeni, M, Audurier, B, Authier, JA, Bacher, D, Perea, I Bachiller, Bachmann, S, Bachmayer, M, Back, JJ, Baladron Rodriguez, P, Balagura, V, Balboni, A, Baldini, W, Baldwin, Z, Balzani, L, Bao, H, Leite, J Baptista de Souza, Barbero Pretel, C, Barbetti, M, Barbosa, IR, Barlow, RJ, Barnyakov, M, Barsuk, S, Barter, W, Bartz, J, Bashir, S, Batsukh, B, Battista, PB, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, IB, Behling, NA, Belin, S, 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Rivera, E Curras, Currie, R, Da Silva, CL, Dadabaev, S, Dai, X, Dall'Occo, E, Dalseno, J, D'Ambrosio, C, Daniel, J, Darze, G, Davidson, A, Davies, JE, Francisco, O De Aguiar, De Angelis, C, De Benedetti, F, de Boer, J, De Bruyn, K, De Capua, S, De Cian, M, De Freitas Carneiro Da Graca, U, De Lucia, E, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, De Vellis, F, de Vries, JA, Debernardis, F, Decamp, D, Dekkers, S, Del Buono, L, Delaney, B, Deng, J, Denysenko, V, Deschamps, O, Dettori, F, Dey, B, Di Nezza, P, Diachkov, I, Didenko, S, Ding, S, Ding, Y, Dittmann, L, Dobishuk, V, Docheva, AD, Doheny, A, Dong, C, Donohoe, AM, Dordei, F, dos Reis, AC, Dowling, AD, Dreyfus, L, Duan, W, Duda, P, Dufour, L, Duk, V, Durante, P, Duras, MM, Durham, JM, Durmus, OD, Dziurda, A, Dzyuba, A, Easo, S, Eckstein, E, Egede, U, Egorychev, A, Egorychev, V, Eisenhardt, S, Ejopu, E ORCID: 0000-0003-3711-7547, Eklund, L, Elashri, M, Blanco, D Elizondo, Ellbracht, J, Ely, S, Ene, A, Eschle, J, Evans, T, 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0000-0002-4174-6509, Idzik, M, Ilin, D, Ilten, P, Iniukhin, A, Iohner, A, Ishteev, A, Ivshin, K, Jage, H, Elles, SJ Jaimes, Jakobsen, S, Jakoubek, T, Jans, E, Jashal, BK, Jawahery, A, Jayaweera, C, Jevtic, V, Jia, Z, Jiang, E, Jiang, X, Jiang, Y, Jiang, YJ, Moya, E Jimenez, Jindal, N, John, M, Rajan, A John Rubesh, Johnson, D, Jones, CR, Joshi, S, Jost, B, Castella, J Juan, Jurik, N, Juszczak, I, Kalecinska, K, Kaminaris, D, Kandybei, S, Kane, M, Kang, Y, Kar, C, Karacson, M, Kauniskangas, A, Kautz, JW, Kazanecki, MK, Keizer, F, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Kholodenko, S, Khreich, G, Kirn, T, Kirsebom, VS, Klaver, S, Kleijne, N, Kleimenova, A, Klekots, DK, Klimaszewski, K, Kmiec, MR, Knospe, T, Kolb, R, Koliiev, S, Kolk, L, Konoplyannikov, A, Kopciewicz, P, Koppenburg, P, Korchin, A, Korolev, M, Kostiuk, I, Kot, O, Kotriakhova, S, Kowalczyk, E, Kozachuk, A, Kravchenko, P, Kravchuk, L, Kravcov, O, Kreps, M, Krokovny, P, Krupa, W, Krzemien, W, Kshyvanskyi, O, Kubis, S, 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Schmidt, N, Schmitt, S, Schmitz, H, Schneider, O, Schopper, A, Schulte, N, Schune, MH, Schwering, G, Sciascia, B, Sciuccati, A, Scriven, G, Segal, I, Sellam, S, Semennikov, A, Senger, T, Soares, M Senghi, Sergi, A, Serra, N, Sestini, L, Seuthe, A, Sanjuan, B Sevilla, Shang, Y, Shangase, DM, Shapkin, M, Sharma, RS, Shchemerov, I, Shchutska, L, Shears, T ORCID: 0000-0002-2653-1366, Shekhtman, L, Shen, Z, Sheng, S, Shevchenko, V, Shi, B, Shi, Q, Shi, WS, Shimizu, Y, Shmanin, E, Shorkin, R, Shupperd, JD, Coutinho, R Silva, Simi, G, Simone, S, Singha, M, Skidmore, N, Skwarnicki, T, Slater, MW, Smith, E, Smith, M, Lavra, L Soares, Sokoloff, MD, Soler, FJP, Solomin, A, Solovev, A, Solovieva, K, Sommerfeld, NS, Song, R, Song, Y, Song, YS, De Almeida, FL Souza, Souza De Paula, B, Sowa, KM, Norella, E Spadaro, Spedicato, E, Speer, JG, Spradlin, P, Stagni, F, Stahl, M, Stahl, S, Stanislaus, S, Stefaniak, M, Steinkamp, O, Strekalina, D, Su, Y, Suljik, F, Sun, J, Sun, L, Sundfeld, D, Sutcliffe, W, 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Zhelezov, A, Zheng, SZ, Zheng, XZ, Zheng, Y, Zhou, T, Zhou, X, Zhou, Y, Zhovkovska, V, Zhu, LZ, Zhu, X, Zhu, Y, Zhukov, V, Zhuo, J, Zuliani, D, Zunica, G, Amey, JL, Amhis, Y and Andersson, M (2026) Precision Measurement of CP Violation and Branching Fractions in B^± → K_S⁰h^± (h = π, K) Decays and Search for the Rare Decay B_c^± → K_S⁰K^± PHYSICAL REVIEW LETTERS, 136 (16). 161801-. ISSN 0031-9007, 1079-7114

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Abstract

The decay B±→KS0π±, with a CP asymmetry expected to be close to zero in the standard model, is theoretically clean and sensitive to potential new physics. An analysis of the decays B±→KS0π± and B±→KS0K± is performed using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1. The CP asymmetries are determined to be ACP(B±→KS0π±)=-0.028±0.009±0.009 and ACP(B±→KS0K±)=0.118±0.062±0.031, and the branching fraction ratio is measured to be B(B±→KS0K±)/B(B±→KS0π±)=0.055±0.004±0.002, where the first uncertainties are statistical and the second are systematic. These results are the most precise measurements of these quantities to date. A search for the rare decay Bc±→KS0K± is also performed. No significant signal is observed, and the upper limit on the product of the branching fraction ratio B(Bc±→KS0K±)/B(B±→KS0π±) and the fragmentation-fraction ratio fc/fu is set to be 0.015 (0.016) at the 90% (95%) confidence level.

Item Type:	Article
Uncontrolled Keywords:	LHCb Collaboration
Divisions:	Faculty of Humanities & Social Sciences Faculty of Science & Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics Faculty of Humanities & Social Sciences > School of the Arts Faculty of Humanities & Social Sciences > School of the Arts > Architecture
Depositing User:	Symplectic Admin
Date Deposited:	30 Apr 2026 09:54
Last Modified:	12 Jun 2026 19:32
DOI:	10.1103/vtgl-j97l
Open Access URL:	https://journals.aps.org/prl/pdf/10.1103/vtgl-j97l
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3198240
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