Open Access

Precision Measurement of $C P$ Violation and Branching Fractions in $B^{\pm} \to K_{S}^{0} h^{\pm}$ ( $h = π$ , $K$ ) Decays and Search for the Rare Decay $B_{c}^{\pm} \to K_{S}^{0} K^{\pm}$

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁸, C. Abellan Beteta ⁵², F. Abudinén ⁵⁸, T. Ackernley ⁶², A. A. Adefisoye ⁷⁰, B. Adeva ⁴⁸, M. Adinolfi ⁵⁶, P. Adlarson ⁸⁶ et al. (LHCb Collaboration)

P. Adlarson ⁸⁶, C. Agapopoulou ¹⁴, C. A. Aidala ⁸⁸, Z. Ajaltouni¹¹, S. Akar ¹¹, K. Akiba ³⁸, M. Akthar ⁴⁰, P. Albicocco ²⁸, J. Albrecht ^19,a, R. Aleksiejunas ⁸², F. Alessio ⁵⁰, P. Alvarez Cartelle ^57,48, R. Amalric ¹⁶, S. Amato ³, J. L. Amey ⁵⁶, Y. Amhis ¹⁴, L. An ⁶, L. Anderlini ²⁷, M. Andersson ⁵², P. Andreola ⁵², M. Andreotti ²⁶, S. Andres Estrada ⁴⁵, A. Anelli ^31,b, D. Ao ⁷, C. Arata ¹², F. Archilli ³⁷, Z. Areg ⁷⁰, M. Argenton ²⁶, S. Arguedas Cuendis ^9,50, L. Arnone ^31,b, A. Artamonov ⁴⁴, M. Artuso ⁷⁰, E. Aslanides ¹³, R. Ataíde Da Silva ⁵¹, M. Atzeni ⁶⁶, B. Audurier ¹², J. A. Authier ¹⁵, D. Bacher ⁶⁵, I. Bachiller Perea ⁵¹, S. Bachmann ²², M. Bachmayer ⁵¹, J. J. Back ⁵⁸, P. Baladron Rodriguez ⁴⁸, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, Z. Baldwin ⁸⁰, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite ², C. Barbero Pretel ^48,12, M. Barbetti ²⁷, I. R. Barbosa ⁷¹, R. J. Barlow ⁶⁴, M. Barnyakov ²⁵, S. Barsuk ¹⁴, W. Barter ⁶⁰, J. Bartz ⁷⁰, S. Bashir ⁴⁰, B. Batsukh ⁵, P. B. Battista ¹⁴, A. Bay ⁵¹, A. Beck ⁶⁶, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁸, A. Bellavista ²⁵, K. Belous ⁴⁴, I. Belov ²⁹, I. Belyaev ³⁶, G. Benane ¹³, G. Bencivenni ²⁸, E. Ben-Haim ¹⁶, A. Berezhnoy ⁴⁴, R. Bernet ⁵², S. Bernet Andres ⁴⁷, A. Bertolin ³³, F. Betti ⁶⁰, J. Bex ⁵⁷, O. Bezshyyko ⁸⁷, S. Bhattacharya ⁸¹, M. S. Bieker ¹⁸, N. V. Biesuz ²⁶, A. Biolchini ³⁸, M. Birch ⁶³, F. C. R. Bishop ¹⁰, A. Bitadze ⁶⁴, A. Bizzeti ^27,c, T. Blake ^58,d, F. Blanc ⁵¹, J. E. Blank ¹⁹, S. Blusk ⁷⁰, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia ⁵⁰, T. Boettcher ⁶⁹, A. Bohare ⁶⁰, A. Boldyrev ⁴⁴, C. Bolognani ⁸⁴, R. Bolzonella ^26,e, R. B. Bonacci ¹, N. Bondar ^44,50, A. Bordelius ⁵⁰, F. Borgato ^33,50, S. Borghi ⁶⁴, M. Borsato ^31,b, J. T. Borsuk ⁸⁵, E. Bottalico ⁶², S. A. Bouchiba ⁵¹, M. Bovill ⁶⁵, T. J. V. Bowcock ⁶², A. Boyer ⁵⁰, C. Bozzi ²⁶, J. D. Brandenburg ⁸⁹, A. Brea Rodriguez ⁵¹, N. Breer ¹⁹, J. Brodzicka ⁴¹, J. Brown ⁶², D. Brundu ³², E. Buchanan ⁶⁰, M. Burgos Marcos ⁸⁴, A. T. Burke ⁶⁴, C. Burr ⁵⁰, C. Buti ²⁷, J. S. Butter ⁵⁷, J. Buytaert ⁵⁰, W. Byczynski ⁵⁰, S. Cadeddu ³², H. Cai ⁷⁶, Y. Cai ⁵, A. Caillet ¹⁶, R. Calabrese ^26,e, S. Calderon Ramirez ⁹, L. Calefice ⁴⁶, M. Calvi ^31,b, M. Calvo Gomez ⁴⁷, P. Camargo Magalhaes ^2,f, J. I. Cambon Bouzas ⁴⁸, P. Campana ²⁸, A. F. Campoverde Quezada ⁷, S. Capelli ³¹, M. Caporale ²⁵, L. Capriotti ²⁶, R. Caravaca-Mora ⁹, A. Carbone ^25,g, L. Carcedo Salgado ⁴⁸, R. Cardinale ^29,h, A. Cardini ³², P. Carniti ³¹, L. Carus ²², A. Casais Vidal ⁶⁶, R. Caspary ²², G. Casse ⁶², M. Cattaneo ⁵⁰, G. Cavallero ²⁶, V. Cavallini ^26,e, S. Celani ⁵⁰, I. Celestino ^35,i, S. Cesare ^30,j, A. J. Chadwick ⁶², I. Chahrour ⁸⁸, H. Chang ^4,k, M. Charles ¹⁶, Ph. Charpentier ⁵⁰, E. Chatzianagnostou ³⁸, R. Cheaib ⁸¹, M. Chefdeville ¹⁰, C. Chen ⁵⁷, J. Chen ⁵¹, S. Chen ⁵, Z. Chen ⁷, A. Chen Hu ⁶³, M. Cherif ¹², A. Chernov ⁴¹, S. Chernyshenko ⁵⁴, X. Chiotopoulos ⁸⁴, V. Chobanova ⁴⁵, M. Chrzaszcz ⁴¹, A. 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Feng ^5,7, A. Fernandez Casani ⁴⁹, M. Fernandez Gomez ⁴⁸, A. D. Fernez ⁶⁸, F. Ferrari ^25,g, F. Ferreira Rodrigues ³, M. Ferrillo ⁵², M. Ferro-Luzzi ⁵⁰, S. Filippov ⁴⁴, R. A. Fini ²⁴, M. Fiorini ^26,e, M. Firlej ⁴⁰, K. L. Fischer ⁶⁵, D. S. Fitzgerald ⁸⁸, C. Fitzpatrick ⁶⁴, T. Fiutowski ⁴⁰, F. Fleuret ¹⁵, A. Fomin ⁵³, M. Fontana ^25,50, L. A. Foreman ⁶⁴, R. Forty ⁵⁰, D. Foulds-Holt ⁶⁰, V. Franco Lima ³, M. Franco Sevilla ⁶⁸, M. Frank ⁵⁰, E. Franzoso ^26,e, G. Frau ⁶⁴, C. Frei ⁵⁰, D. A. Friday ^64,50, J. Fu ⁷, Q. Führing ^19,57,a, T. Fulghesu ¹³, G. Galati ^24,o, M. D. Galati ³⁸, A. Gallas Torreira ⁴⁸, D. Galli ^25,g, S. Gambetta ⁶⁰, M. Gandelman ³, P. Gandini ³⁰, B. Ganie ⁶⁴, H. Gao ⁷, R. Gao ⁶⁵, T. Q. Gao ⁵⁷, Y. Gao ⁸, Y. Gao ⁶, Y. Gao ⁸, L. M. Garcia Martin ⁵¹, P. Garcia Moreno ⁴⁶, J. García Pardiñas ⁶⁶, P. Gardner ⁶⁸, L. Garrido ⁴⁶, C. Gaspar ⁵⁰, A. Gavrikov ³³, L. L. Gerken ¹⁹, E. Gersabeck ²⁰, M. Gersabeck ²⁰, T. Gershon ⁵⁸, S. Ghizzo ^29,h, Z. Ghorbanimoghaddam ⁵⁶, F. I. 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Menendez Valdes Perez ⁴⁸, F. M. Meng ^4,k, M. Merk ^38,84, A. Merli ^51,30, L. Meyer Garcia ⁶⁸, D. Miao ^5,7, H. Miao ⁷, M. Mikhasenko ⁸⁰, D. A. Milanes ^78,v, A. Minotti ^31,b, E. Minucci ²⁸, T. Miralles ¹¹, B. Mitreska ⁶⁴, D. S. Mitzel ¹⁹, R. Mocanu ⁴³, A. Modak ⁵⁹, L. Moeser ¹⁹, R. D. Moise ¹⁷, E. F. Molina Cardenas ⁸⁸, T. Mombächer ⁶⁷, M. Monk ⁵⁷, T. Monnard ⁵¹, S. Monteil ¹¹, A. Morcillo Gomez ⁴⁸, G. Morello ²⁸, M. J. Morello ^35,i, M. P. Morgenthaler ²², A. Moro ^31,b, J. Moron ⁴⁰, W. Morren ³⁸, A. B. Morris ^82,50, A. G. Morris ¹³, R. Mountain ⁷⁰, Z. M. Mu ⁶, E. Muhammad ⁵⁸, F. Muheim ⁶⁰, M. Mulder ³⁸, K. Müller ⁵², F. Muñoz-Rojas ⁹, R. Murta ⁶³, V. Mytrochenko ⁵³, P. Naik ⁶², T. Nakada ⁵¹, R. Nandakumar ⁵⁹, T. Nanut ⁵⁰, G. Napoletano ⁵¹, I. Nasteva ³, M. Needham ⁶⁰, E. Nekrasova ⁴⁴, N. Neri ^30,j, S. Neubert ¹⁸, N. Neufeld ⁵⁰, P. Neustroev⁴⁴, J. Nicolini ⁵⁰, D. Nicotra ⁸⁴, E. M. Niel ¹⁵, N. Nikitin ⁴⁴, L. Nisi ¹⁹, Q. Niu ⁷⁵, B. K. Njoki ⁵⁰, P. Nogarolli ³, P. Nogga ¹⁸, C. 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Perret ¹¹, A. Perrevoort ⁸³, A. Perro ⁷⁴, M. J. Peters ⁶⁷, K. Petridis ⁵⁶, A. Petrolini ^29,h, S. Pezzulo ^29,h, J. P. Pfaller ⁶⁷, H. Pham ⁷⁰, L. Pica ^35,i, M. Piccini ³⁴, L. Piccolo ³², B. Pietrzyk ¹⁰, G. Pietrzyk ¹⁴, R. N. Pilato ⁶², D. Pinci ³⁶, F. Pisani ⁵⁰, M. Pizzichemi ^31,50,b, V. M. Placinta ⁴³, M. Plo Casasus ⁴⁸, T. Poeschl ⁵⁰, F. Polci ¹⁶, M. Poli Lener ²⁸, A. Poluektov ¹³, N. Polukhina ⁴⁴, I. Polyakov ⁶⁴, E. Polycarpo ³, S. Ponce ⁵⁰, D. Popov ^7,50, K. Popp ¹⁹, S. Poslavskii ⁴⁴, K. Prasanth ⁶⁰, C. Prouve ⁴⁵, D. Provenzano ^32,50,m, V. Pugatch ⁵⁴, A. Puicercus Gomez ⁵⁰, G. Punzi ^35,s, J. R. Pybus ⁶⁹, Q. Q. Qian ⁶, W. Qian ⁷, N. Qin ^4,k, R. Quagliani ⁵⁰, R. I. Rabadan Trejo ⁵⁸, R. Racz ⁸², J. H. Rademacker ⁵⁶, M. Rama ³⁵, M. Ramírez García ⁸⁸, V. Ramos De Oliveira ⁷¹, M. Ramos Pernas ⁵⁸, M. S. Rangel ³, F. Ratnikov ⁴⁴, G. Raven ³⁹, M. Rebollo De Miguel ⁴⁹, F. Redi ^30,u, J. Reich ⁵⁶, F. Reiss ²⁰, Z. Ren ⁷, P. K. Resmi ⁶⁵, M. Ribalda Galvez ⁴⁶, R. Ribatti ⁵¹, G. Ricart ¹², D. Riccardi ^35,i, S. Ricciardi ⁵⁹, K. Richardson ⁶⁶, M. Richardson-Slipper ⁵⁷, F. Riehn ¹⁹, K. Rinnert ⁶², P. Robbe ^14,50, G. Robertson ⁶¹, E. Rodrigues ⁶², A. Rodriguez Alvarez ⁴⁶, E. Rodriguez Fernandez ⁴⁸, J. A. Rodriguez Lopez ⁷⁸, E. Rodriguez Rodriguez ⁵⁰, J. Roensch ¹⁹, A. Rogachev ⁴⁴, A. Rogovskiy ⁵⁹, D. L. Rolf ¹⁹, P. Roloff ⁵⁰, V. Romanovskiy ⁶⁷, A. Romero Vidal ⁴⁸, G. Romolini ^26,50, F. Ronchetti ⁵¹, T. Rong ⁶, M. Rotondo ²⁸, S. R. Roy ²², M. S. Rudolph ⁷⁰, M. Ruiz Diaz ²², R. A. Ruiz Fernandez ⁴⁸, J. Ruiz Vidal ⁸⁴, J. J. Saavedra-Arias ⁹, J. J. Saborido Silva ⁴⁸, S. E. R. Sacha Emile R.⁵⁰, N. Sagidova ⁴⁴, D. Sahoo ⁸¹, N. Sahoo ⁵⁵, B. Saitta ³², M. Salomoni ^31,50,b, I. Sanderswood ⁴⁹, R. Santacesaria ³⁶, C. Santamarina Rios ⁴⁸, M. Santimaria ²⁸, L. Santoro ², E. Santovetti ³⁷, A. Saputi ^26,50, D. Saranin ⁴⁴, A. Sarnatskiy ⁸³, G. Sarpis ⁵⁰, M. Sarpis ⁸², C. Satriano ³⁶, A. Satta ³⁷, M. Saur ⁷⁵, D. Savrina ⁴⁴, H. Sazak ¹⁷, F. Sborzacchi ^50,28, A. 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Zhang ⁶⁵, S. L. Zhang ⁷³, Y. Zhang ⁶, Y. Z. Zhang ^4,k, Z. Zhang ^4,k, Y. Zhao ²², A. Zhelezov ²², S. Z. Zheng ⁶, X. Z. Zheng ^4,k, Y. Zheng ⁷, T. Zhou ⁶, X. Zhou ⁸, Y. Zhou ⁷, V. Zhovkovska ⁵⁸, L. Z. Zhu ⁷, X. Zhu ^4,k, X. Zhu ⁸, Y. Zhu ¹⁷, V. Zhukov ¹⁷, J. Zhuo ⁴⁹, D. Zuliani ^33,t, and G. Zunica ²⁸ (LHCb Collaboration)

¹School of Physics and Astronomy, Monash University, Melbourne, Australia
²Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
³Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
⁴Department of Engineering Physics, Tsinghua University, Beijing, China
⁵Institute Of High Energy Physics (IHEP), Beijing, China
⁶School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁷University of Chinese Academy of Sciences, Beijing, China
⁸Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁹Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica
¹⁰Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
¹¹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²Université Paris-Saclay, Centre d’Etudes de Saclay (CEA), IRFU, Saclay, France, Gif-Sur-Yvette, France
¹³Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹⁴Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹⁵Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹⁶Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, F-75005 Paris, France, Paris, France
¹⁷I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁸Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
¹⁹Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
²⁰Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
²¹Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
²²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
²³School of Physics, University College Dublin, Dublin, Ireland
²⁴INFN Sezione di Bari, Bari, Italy
²⁵INFN Sezione di Bologna, Bologna, Italy
²⁶INFN Sezione di Ferrara, Ferrara, Italy
²⁷INFN Sezione di Firenze, Firenze, Italy
²⁸INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁹INFN Sezione di Genova, Genova, Italy
³⁰INFN Sezione di Milano, Milano, Italy
³¹INFN Sezione di Milano-Bicocca, Milano, Italy
³²INFN Sezione di Cagliari, Monserrato, Italy
³³INFN Sezione di Padova, Padova, Italy
³⁴INFN Sezione di Perugia, Perugia, Italy
³⁵INFN Sezione di Pisa, Pisa, Italy
³⁶INFN Sezione di Roma La Sapienza, Roma, Italy
³⁷INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁸Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³⁹Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
⁴⁰AGH - University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland
⁴¹Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
⁴²National Center for Nuclear Research (NCBJ), Warsaw, Poland
⁴³Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
⁴⁴Authors affiliated with an institute formerly covered by a cooperation agreement with CERN
⁴⁵Universidade da Coruña, A Coruña, Spain
⁴⁶ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁷La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴⁸Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁹Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain
⁵⁰European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁵¹Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵²Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵³NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵⁴Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵⁵School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁵⁶H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁷Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁸Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁹STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁶⁰School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁶¹School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶²Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶³Imperial College London, London, United Kingdom
⁶⁴Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶⁵Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁶Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁷University of Cincinnati, Cincinnati, Ohio, USA
⁶⁸University of Maryland, College Park, Maryland, USA
⁶⁹Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁷⁰Syracuse University, Syracuse, New York, USA
⁷¹Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil]
⁷²Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland)
⁷³School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷⁴State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁵Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China)
⁷⁶School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁷Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷⁸Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia [associated with Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, F-75005 Paris, France, Paris, France]
⁷⁹Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic (associated with Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom)
⁸⁰Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁸¹Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁸²Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
⁸³Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁴Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁵Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸⁶Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸⁷Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
⁸⁸University of Michigan, Ann Arbor, MI, United States (associated with Syracuse University, Syracuse, New York, USA)
⁸⁹Ohio State University, Columbus, United States [associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA]

^*Full author list given at the end of the Letter.
^aAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
^bAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
^cAlso at Università di Modena e Reggio Emilia, Modena, Italy.
^dAlso at Department of Physics and Astronomy, University of Victoria, Victoria, Canada.
^eAlso at Università di Ferrara, Ferrara, Italy.
^fAlso at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
^gAlso at Università di Bologna, Bologna, Italy.
^hAlso at Università di Genova, Genova, Italy.
ⁱAlso at Scuola Normale Superiore, Pisa, Italy.
^jAlso at Università degli Studi di Milano, Milano, Italy.
^kAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
^lAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
^mAlso at Università di Cagliari, Cagliari, Italy.
ⁿAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
^oAlso at Università di Bari, Bari, Italy.
^pAlso at Università di Perugia, Perugia, Italy.
^qAlso at LIP6, Sorbonne Université, Paris, France.
^rAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^sAlso at Università di Pisa, Pisa, Italy.
^tAlso at Università di Padova, Padova, Italy.
^uAlso at Università di Bergamo, Bergamo, Italy.
^vAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
^wAlso at Università di Siena, Siena, Italy.
^xAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^yAlso at Università di Urbino, Urbino, Italy.

PDF

Phys. Rev. Lett. 136, 161801 – Published 21 April, 2026

DOI: https://doi.org/10.1103/vtgl-j97l

Abstract

The decay $B^{\pm} \to K_{S}^{0} π^{\pm}$ , with a $C P$ 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 $B^{\pm} \to K_{S}^{0} π^{\pm}$ and $B^{\pm} \to K_{S}^{0} K^{\pm}$ 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 $C P$ asymmetries are determined to be $A^{C P} (B^{\pm} \to K_{S}^{0} π^{\pm}) = - 0.028 \pm 0.009 \pm 0.009$ and $A^{C P} (B^{\pm} \to K_{S}^{0} K^{\pm}) = 0.118 \pm 0.062 \pm 0.031$ , and the branching fraction ratio is measured to be $B (B^{\pm} \to K_{S}^{0} K^{\pm}) / B (B^{\pm} \to K_{S}^{0} π^{\pm}) = 0.055 \pm 0.004 \pm 0.002$ , 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 $B_{c}^{\pm} \to K_{S}^{0} K^{\pm}$ is also performed. No significant signal is observed, and the upper limit on the product of the branching fraction ratio $B (B_{c}^{\pm} \to K_{S}^{0} K^{\pm}) / B (B^{\pm} \to K_{S}^{0} π^{\pm})$ and the fragmentation-fraction ratio $f_{c} / f_{u}$ is set to be 0.015 (0.016) at the 90% (95%) confidence level.

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Phys. Rev. Lett. 136, 161801– Published 21 April, 2026

Vol. 136, Iss. 16 — 24 April 2026

Received 11 December 2025
Accepted 24 March 2026

DOI: https://doi.org/10.1103/vtgl-j97l

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Precision Measurement of $C P$ Violation and Branching Fractions in $B^{\pm} \to K_{S}^{0} h^{\pm}$ ( $h = π$ , $K$ ) Decays and Search for the Rare Decay $B_{c}^{\pm} \to K_{S}^{0} K^{\pm}$

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Precision Measurement of CP Violation and Branching Fractions in B±→KS0h± (h=π, K) Decays and Search for the Rare Decay Bc±→KS0K±

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Precision Measurement of $C P$ Violation and Branching Fractions in $B^{\pm} \to K_{S}^{0} h^{\pm}$ ( $h = π$ , $K$ ) Decays and Search for the Rare Decay $B_{c}^{\pm} \to K_{S}^{0} K^{\pm}$