Measurement of the charge asymmetry in semileptonic Bs decays

Abstract

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.

arXiv commentSubmitted to Phys. Rev. Lett

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• SM with four generations: Selected implications for rare B and K decays
• Unparticle physics effects in B_s mixing
• Search for CP violation in semileptonic Bs decays
• Chirally enhanced corrections to FCNC processes in the generic MSSM
• Combined D0 Measurements Constraining the CP-violating Phase and Width Difference in the $B_s^0$ System
• Searching for New Physics in b to s Hadronic Penguin Decays
• Study of direct CP violation in $B^{\pm }\to J/\psi K^{\pm }({\pi }^{\pm })$ decays
• Implications of the measurements of B_s - B_s bar mixing on SUSY models
• The Theoretical status of $\bar{B}-B$-mixing and lifetimes of heavy hadrons
• Resolving the sign ambiguity in Delta Gamma_s with B_s -> D_s K
• CKM matrix fits including constraints on New Physics
• CP parameters of the B systems from Tevatron
• CP asymmetries at D0