Measurement of the Charge Asymmetry in Semileptonic $B_{s}^{0}$ Decays

Open Access

We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic

B_{s}^{0}

decays

A_{SL}^{s, unt}

by comparing the decay rate of

B_{s}^{0} \to μ^{+} D_{s}^{-} ν X

, where

D_{s}^{-} \to ϕ π^{-}

and

ϕ \to K^{+} K^{-}

, with the charge-conjugate

{\bar{B}}_{s}^{0}

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

A_{SL}^{s, unt} = [1.23 \pm 0.97 (stat) \pm 0.17 (syst)] \times 10^{- 2}

. Assuming that

Δ m_{s} / {\bar{Γ}}_{s} ≫ 1

, this result can be translated into a measurement of the

C P

-violating phase in

B_{s}^{0}

mixing:

Δ Γ_{s} / Δ m_{s} \tan ﻿ ϕ_{s} = [2.45 \pm 1.93 (stat) \pm 0.35 (syst)] \times 10^{- 2}

This publication has 19 references indexed in Scilit:

Measurement of the $C P$ -violation parameter of $B^{0}$ mixing and decay with $p \bar{p} \to μ μ X$ data
Physical Review D, 2006
Direct Limits on the $B_{s}^{0}$ Oscillation Frequency
Physical Review Letters, 2006
Review of Particle Physics
Journal of Physics G: Nuclear and Particle Physics, 2006
The upgraded DØ detector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2006
The muon system of the Run II DØdetector
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
b-tagging in DELPHI at LEP
The European Physical Journal C, 2004
CP asymmetry in flavour-specific B decays beyond leading logarithms
Physics Letters B, 2003
Combined b-tagging
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998
A complete analysis of FCNC and CP constraints in general SUSY extensions of the standard model
Nuclear Physics B, 1996
New clustering algorithm for multijet cross sections in e+e− annihilation
Physics Letters B, 1991

Measurement of the Charge Asymmetry in SemileptonicBs0Decays