Measurement of the effective B s 0 → J / ψ K S 0
R. Aaij,C. Abellán Beteta,B. Adeva,M. Adinolfi,C. Adrover,A. Affolder,Z. Ajaltouni,J. Albrecht,F. Alessio,M. Alexander,S. Ali,G. Alkhazov,P. Alvarez Cartelle,A. A. Alves,S. Amato,S. Amerio,Y. Amhis,L. Anderlini,J. Anderson,R. Andreassen,R. B. Appleby,O. Aquines Gutierrez,F. Archilli,A. Artamonov,M. Artuso,E. Aslanides,G. Auriemma,S. Bachmann,J. J. Back,C. Baesso,V. Balagura,W. Baldini,R. J. Barlow,C. Barschel,S. Barsuk,W. Barter,Th. 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,M. O. Bettler,M. van Beuzekom,A. Bień,S. Bifani,T. Bird,A. Bizzeti,P. M. Bjørnstad,T. Blake,F. Blanc,J. Blouw,S. Blusk,V. Bocci,A. Bondar,N. Bondar,W. Bonivento,S. Borghi,A. Borgia,T. J. V. Bowcock,E. Bowen,C. Bozzi,T. Brambach,J. van den Brand,J. Bressieux,D. Brett,M. Britsch,T. Britton,N. H. Brook,H. Brown,I. Burducea,A. Bursche,G. Busetto,J. Buytaert,S. Cadeddu,O. Callot,M. Calvi,M. Calvo Gomez,A. 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Nuclear Physics B(2013)
Cited 30|Views0
Abstract
This paper reports the first measurement of the effective B_s^0 -> J/{\psi} K_S^0 lifetime and an updated measurement of its time-integrated branching fraction. Both measurements are performed with a data sample, corresponding to an integrated luminosity of 1.0 fb^{-1} of pp collisions, recorded by the LHCb experiment in 2011 at a centre-of-mass energy of 7 TeV. The results are: tau_J/{\psi}K_S^0 = 1.75 +/- 0.12 (stat) +/- 0.07 (syst) and BR(B_s^0 -> J/{\psi} K_S^0) = (1.97 +/- 0.23) X 10^{-5}. For the latter measurement, the uncertainty includes both statistical and systematic sources.
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