Eur. Phys. J. C 24, 121-126 (2002)
https://doi.org/10.1007/s100520200929

Calculation of pure annihilation type decay B⁺ → D_s⁺φ

¹ CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China
² Institute of High Energy Physics, CAS, P.O. Box 918(4) Beijing 100039, P.R. China

Corresponding author: ^a lucd@ihep.ac.cn

Received: 16 January 2002
Published online: 5 April 2002

Abstract

The rare decay B⁺ → D_s⁺φ can occur only via annihilation-type diagrams in the standard model. We calculated this decay in the perturbative QCD approach with Sudakov resummation. We found that the branching ratio of B⁺ → D_s⁺φ is of order 10^-7; this may be measured in the near future by the KEK and SLAC B factories. The small branching ratio predicted in the standard model makes this channel sensitive to new physics contributions.