Eur. Phys. J. C (2007) 50: 363-371
https://doi.org/10.1140/epjc/s10052-007-0209-7

Regular Article - Theoretical Physics

Branching ratio and CP-asymmetry of B_s→ρ(ω)K decays in the perturbative QCD approach

Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu, 210097, P.R. China

^* e-mail: xiaozhenjun@njnu.edu.cn

Received: 20 September 2006
Revised: 20 December 2006
Published online: 3 February 2007

Abstract

In this paper, we calculate the branching ratios and CP-violating asymmetries for B_s→ρ^±K^∓, ρ⁰K̄⁰ and ωK̄⁰ decays in the perturbative QCD factorization approach. The theoretical predictions for the CP-averaged branching ratios of the considered decays are Br(B_s→ρ^±K^∓)≈24.7×10^-6, Br(B_s→ρ⁰K̄⁰)≈1.2×10^-7 and Br(B_s→ωK̄⁰)≈1.7×10^-7; and we also predict large CP-violating asymmetries for the considered decay modes. Specifically, the large A_CP ^dir(B_s→ρ^±K^∓) at -12% level plus large branching ratio at 10^-5 level are measurable in the forthcoming LHC-b experiments.