Analysis of Λb→pK−and pπ−decays in a flavor changing Z′ model

Shuai-Wei Wang, Jin-Shu Huang, Gen-Quan Li
2013 Chinese Physics C, High Energy Physics & Nuclear Physics  
In this paper, we calculate the branching ratios of Λ_b→ pK^- and pπ^- decays in the flavor changing Z^' model. We find that the branching ratios for these two decay modes are sensitive to the contributions of Z^' boson. For Λ_b→ p K^- decay, if the left-handed couplings are equal to the right-handed couplings, the branching ratio of this decay could match up to the currently experimental data for ξ_s=0.01 and -52^∘<ϕ^L_s<132^∘, or ξ_s=0.004 and 0^∘<ϕ^L_s<84^∘; if only the left-handed couplings
more » ... are considered, it could match up to the experimental data for ξ_s=0.01 and -10^∘<ϕ^L_s<138^∘. And for Λ_b→ pπ^- decay, if the left-handed and right-handed couplings are equal, the branching ratio of Λ_b→ pπ^- decay may be consistent with the currently experimental data with ξ_d=0.05 and -135^∘<ϕ^L_d<43^∘, if only the left-handed couplings are considered, it may be consistent with ξ_d=0.05 and -114^∘<ϕ^L_d<8^∘.
doi:10.1088/1674-1137/37/6/063103 fatcat:3y7bqkeqf5fdxazxzowvewsfve