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Physical Review Letters 110 (2013) 011801
Measurement of the semileptonic charge asymmetry using Bs^0 -> D_s mu X decays
V.M. Abazov, S. Greder1, F. Miconi1, I. Ripp-Baudot1, G. Bernardi2, D. Brown2, J. Brown2, Y. Enari2, J. Lellouch2, J.-F. Grivaz3, T. Guillemin3, M. Jaffré3, P. Pétroff3, G. Grenier4, T. Kurca4, P. Lebrun4, P. Verdier4, F. Badaud5, P. Gay5, Ph. Gris5, M. C. Cousinou6, A. Duperrin6, W. Geng6, E. Kajfasz6, S. Kermiche6, E. Nagy6, N. Osman6, H. Li7, G. Sajot7, J. Stark7
For the D0 collaboration(s)
(2013)

We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of Bs mesons that have undergone flavor mixing, a^s_ls, using B_s^0 (barB_s^0) -> D_s^-/+ mu^+/- X decays, with D_s^-/+ -> phi pi^-/+ and phi K^+ K^-, using 10.4 fb^-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. A fit to the difference between the time-integrated D_s^-$ and D_s^+ mass distributions of the B_s^0 and barB^0_s candidates yields the flavor-specific asymmetry a^s_ls = [-1.08 pm 0.72 (stat) +/-0.17 (syst)]% which is the most precise measurement and in agreement with the standard model prediction.
1:  IPHC - Institut Pluridisciplinaire Hubert Curien
2:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3:  LAL - Laboratoire de l'Accélérateur Linéaire
4:  IPNL - Institut de Physique Nucléaire de Lyon
5:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
6:  CPPM - Centre de Physique des Particules de Marseille
7:  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physics/High Energy Physics - Experiment
Fulltext link: 
http://fr.arXiv.org/abs/1207.1769