Measurement of the charge asymmetry in semileptonic Bs0 decays.

Journal article

We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic Bs0 decays ASLs,unt by comparing the decay rate of Bs0-->micro+Ds-nuX, where Ds- -->phipi- and phi-->K+K-, with the charge-conjugate Bs0 decay rate. This sample was selected from 1.3 fb-1 of data collected by the D0 experiment in run II of the Fermilab Tevatron collider. We obtain ASLs,unt=[1.23+/-0.97(stat)+/-0.17(syst)]x10(-2). Assuming that Deltam(s)/Gamma(s)>>1, this result can be translated into a measurement of the CP-violating phase in Bs0 mixing: DeltaGamma(s)/Deltam(s)tanphi(s)=[2.45+/-1.93(stat)+/-0.35(syst)]x10(-2).

Authors: Abazov, V; Abbott, B; Abolins, M; Acharya, B; Adams, M

• Journal: Physical Review Letters
• Volume: 98
• Issue: 15
• Pages: 151801
• Publication date: 2007-04-01
• DOI: 10.1103/physrevlett.98.151801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: D0 Collaboration