Measurement of mixing and the CPV phase φs in the B s system at LHCb

Gerhard Raven*

*Corresponding author for this work

Research output: Chapter in Book / Report / Conference proceedingConference contributionAcademicpeer-review

Abstract

• Using 1 fb-1, i.e. 21.2k Bs → J/ψ phi(KK), • φs = -0.001 ± 0.101(stat) ± 0.027 (sys) rad • ΔΓs = 0.116 ± 0.018 (stat) ± 0.006 (sys) ps-1 • Γs = 0.658 ± 0.005 (stat) ± 0.007 (sys) ps-1 • With 0.37 fb-1, using Bs →J/ψKK the two-fold ambiguity is resolved • The 'proper' solution is the one with ΔΓs > 0 and φs ∼ 0 • With 1 fb-1, the resonant structure of Bs→J/ψππ has been studied • 775 MeV < m(ππ) < 1550 MeV found to be CP-odd • And this range is subsequently used to measure: • φs = -0.019 +0.173 -0.174 +0.004 -0.003 rad • Using 0.37 fb-1, measure Br and polarization of Bs→ J/ψ K̄*(Kπ) : Br( Bs→ J/ψ K̄*(892) ) = ( 4.4 +0.5 -0.4 ± 0.8 ) 10-5 fL = 0.50 ± 0.08 ± 0.02 f// = 0.19 +0.10 -0.08 ± 0.02 |AS|2 = 0.07 +0.15 -0.07 within 40 MeV/c2 of K*0(892) • On schedule to collect about 2.2 fb-1 at 8 TeV in 2012→.

Original languageEnglish
Title of host publication7th International Workshop on the CKM Unitarity Triangle, CKM 2012
Publication statusPublished - 2012
Event7th International Workshop on the CKM Unitarity Triangle, CKM 2012 - Cincinnati, OH, United States
Duration: 28 Sep 20122 Oct 2012

Conference

Conference7th International Workshop on the CKM Unitarity Triangle, CKM 2012
CountryUnited States
CityCincinnati, OH
Period28/09/122/10/12

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