Measurement of the flavour-specific CP-violating asymmetry a(sl)(s) in B-s(0) decays

LHCb collaboration

Research output: Contribution to journalArticleAcademicpeer-review


The CP-violating asymmetry a(sl)(s), is studied using semileptonic decays of B-s(0) and (B) over bar (0)(s) mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiting a data sample corresponding to an integrated luminosity of 1.0 fb(-1). The reconstructed final states are D-s(+/-)mu(+/-)(s), with the D-s(+/-) particle decaying in the phi pi(+/-) mode. The D-s(+/-)mu(+/-)(s) yields are summed over B-s(0) and (B) over bar (0)(s) initial states, and integrated with respect to decay time. Data-driven methods are used to measure efficiency ratios. We obtain a(sl)(s) = (-0.06 +/- 0.50 +/- 0.36)%, where the first uncertainty is statistical and the second systematic. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)607-615
Number of pages9
JournalPhysics Letters B
Publication statusPublished - 20 Jan 2014
Externally publishedYes


  • ROOT-S=7 TEV
  • PP

Cite this