Determination of the sign of the decay width difference in the bs0 system

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

Journal article

Determination of the sign of the decay width difference in the bs0 system

R Aaij, C Abellan Beteta, B Adeva, M Adinolfi, C Adrover, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, G Alkhazov, P Alvarez Cartelle, AA Alves, S Amato, Y Amhis, J Anderson, RB Appleby, O Aquines Gutierrez, F Archilli, L Arrabito Show all

Physical Review Letters | AMER PHYSICAL SOC | Published : 2012

DOI: 10.1103/PhysRevLett.108.241801

Abstract

The interference between the K +K - S-wave and P-wave amplitudes in Bs0→J/ψK +K - decays with the K +K - pairs in the region around the (1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K +K - invariant mass. Combined with the results from our CP asymmetry measurement in Bs0→J/ψ decays, we conclude that the Bs0 mass eigenstate that is almost CP=+1 is lighter and decays faster than the mass eigenstate that is almost CP=-1. This determines the sign of the decay width difference ΔΓ sΓ L-Γ H to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase s to be close to ze..

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University of Melbourne Researchers

Phillip Urquijo 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 CERN and at the LHCb institutes and acknowledge support from the National Agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); CERN; NSFC (China); CNRS/IN2P3 (France); BMBF, DFG, HGF, and MPG (Germany); SFI (Ireland); INFN (Italy); FOM and NWO (The Netherlands); SCSR (Poland); ANCS (Romania); MinES of Russia and Rosatom (Russia); MICINN, XuntaGal, and GENCAT (Spain); SNSF and SER (Switzerland); NAS Ukraine (Ukraine); STFC (United Kingdom); and NSF (USA). We also acknowledge the support received from the ERC under FP7 and the Region Auvergne.