Measurement of the charge asymmetry in semileptonic Bs decays

TL;DR

This paper reports the first direct measurement of the flavor untagged charge asymmetry in semileptonic Bs decays, providing insights into CP violation in Bs mixing using data from the Fermilab Tevatron.

Contribution

It presents the first direct measurement of Asl(unt) in Bs decays and translates it into a constraint on the CP-violating phase phi_s.

Findings

Measured Asl(unt) = (1.23 ± 0.97 (stat) ± 0.17 (syst)) × 10^-2

Derived constraint on CP-violating phase: (2.45 ± 1.93 (stat) ± 0.35 (syst)) × 10^-2

Utilized 1.3/fb of data from the D0 experiment at Fermilab.

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.