Eur. Phys. J. C (2012) 72: 1852
https://doi.org/10.1140/epjc/s10052-011-1852-6

Regular Article - Theoretical Physics

Study of Λ _b →Λρ ⁰, pK ^∗− and pρ ⁻ decays in the non-universal Z′ model

Department of Physics, Nanyang Normal University, Nanyang, 473061, China

^* e-mail: shuaiweiwang@sina.com

Received: 13 November 2011
Revised: 9 December 2011
Published online: 3 January 2012

Abstract

We have investigated the effects of the family of a non-universal Z′ model on the Λ _b →Λρ ⁰, pK ^∗− and pρ ⁻ decays. This model includes the interactions between fermions and the Z′ boson, with the contributions of flavor-changing neutral currents (FCNCs) mediated by the Z′ boson, and we find that the branching ratio for Λ _b →Λρ ⁰ decay is significantly enhanced from its corresponding standard model (SM) value. It reaches up to the level; the currently running experiments could make observations of this decay process. For the Λ _b →pK ^∗− and Λ _b →pρ ⁻ decays, their branching ratios are also sensitive to the new physics (NP) weak phases.