First observation of CP violation in the decays of Bs0 mesons

R Aaij; C Abellan Beteta; B Adeva; M Adinolfi; C Adrover; A Affolder; Z Ajaltouni; J Albrecht; F Alessio; M Alexander; S Ali; G Alkhazov; P Alvarez Cartelle; AA Alves; S Amato; S Amerio; Y Amhis; L Anderlini; J Anderson; R Andreassen; RB Appleby; O Aquines Gutierrez; F Archilli; A Artamonov; M Artuso; E Aslanides; G Auriemma; S Bachmann; JJ Back; C Baesso; V Balagura; W Baldini; RJ Barlow; C Barschel; S Barsuk; W Barter; T Bauer; A Bay; J Beddow; F Bedeschi; I Bediaga; S Belogurov; K Belous; I Belyaev; E Ben-Haim; G Bencivenni; S Benson; J Benton; A Berezhnoy; R Bernet; MO Bettler; M Van Beuzekom; A Bien; S Bifani; T Bird; A Bizzeti; PM Bjørnstad; T Blake; F Blanc; J Blouw; S Blusk; V Bocci; A Bondar; N Bondar; W Bonivento; S Borghi; A Borgia; TJV Bowcock; E Bowen; C Bozzi; T Brambach; J Van Den Brand; J Bressieux; D Brett; M Britsch; T Britton; NH Brook; H Brown; I Burducea; A Bursche; G Busetto; J Buytaert; S Cadeddu; O Callot; M Calvi; M Calvo Gomez; A Camboni; P Campana; D Campora Perez; A Carbone; G Carboni; R Cardinale; A Cardini; H Carranza-Mejia; L Carson; K Carvalho Akiba; G Casse; L Castillo Garcia; M Cattaneo; C Cauet

Journal article

First observation of CP violation in the decays of Bs0 mesons

R Aaij, C Abellan Beteta, B Adeva, M Adinolfi, C Adrover, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, S Ali, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, S Amerio, Y Amhis, L Anderlini, J Anderson, R Andreassen Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2013

DOI: 10.1103/PhysRevLett.110.221601

Abstract

Using pp collision data corresponding to an integrated luminosity of 1.0 fb-1 and collected by LHCb in 2011 at a center-of-mass energy of 7 TeV, we report the measurement of direct CP violation in Bs0→K -π+ decays, ACP(Bs0→K -π+)=0.27±0.04 (stat)±0.01 (syst), with significance exceeding 5 standard deviations. This is the first observation of CP violation in the decays of Bs0 mesons. Furthermore, we provide an improved determination of direct CP violation in B0→K+π- decays, ACP(B0→K+π-)=-0.080±0. 007 (stat)±0.003 (syst), which is the most precise measurement of this quantity to date. © 2013 CERN. Published by the American Physical Society under the terms of the Creative Commons Attribution 3...

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University of Melbourne Researchers

Anna Phan Author

Grants

Awarded by National Science Foundation

Funding Acknowledgements

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); NSFC (China); CNRS/IN2P3 and Region Auvergne (France); BMBF, DFG, HGF, and MPG (Germany); SFI (Ireland); INFN (Italy); FOM and NWO (The Netherlands); SCSR (Poland); ANCS/IFA (Romania); MinES, Rosatom, RFBR, and NRC "Kurchatov Institute" (Russia); MinECo, XuntaGal, and GENCAT (Spain); SNSF and SER (Switzerland); NAS Ukraine (Ukraine); STFC (U.K.); NSF (U.S.). We also acknowledge the support received from the ERC under FP7. The Tier1 computing centres are supported by IN2P3 (France), KIT, and BMBF (Germany); INFN (Italy); NWO and SURF (The Netherlands); PIC (Spain); and GridPP (U.K.). We are thankful for the computing resources put at our disposal by Yandex LLC (Russia), as well as to the communities behind the multiple open source software packages that we depend on.