Measurement of the charge asymmetry in semileptonic Bs decays

Details Measurement of the charge asymmetry in semileptonic Bs decays Measurement of the charge asymmetry in semileptonic Bs decays

2007-01-06

arxiv.org/abs/hep-ex/0701007v2

Phys.Rev.Lett.98:151801,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.98.151801

We have performed the first direct measurement of the time integrated flavor untagged charge asymmetry in semileptonic Bs decays, Asl(unt), by comparing the decay rate of Bs --> mu+ Ds- nu X, where Ds- --> phi pi- and phi --> K+K-, with the charge-conjugate Bs-bar decay rate. This sample was selected from 1.3/fb of data collected by the D0 experiment in RunII of the Fermilab Tevatron collider. We obtain Asl(unt) = [1.23 +- 0.97(stat) +- 0.17(syst)]*10^-2. Assuming that Delta(M_s)/Gamma_s >> 1 and Delta(Gamma_s)/(2 Gamma_s) < 1, this result can be translated into a measurement on the CP-violating phase in Bs mixing: Delta(Gamma_s)/Delta(M_s)*tan(phi_s) = [2.45 +- 1.93(stat) +- 0.35(syst)]*10^-2.

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