The decay of $\Lambda_b\rightarrow p~K^-$ in QCD factorization approach

TL;DR

This paper investigates the decay of Lambda_b to pK- using QCD factorization, incorporating one-loop QCD corrections and diquark approximation to accurately predict branching ratios and CP violation consistent with experimental data.

Contribution

It introduces a detailed calculation of Lambda_b decay including QCD penguin effects and one-loop corrections within the QCD factorization framework, improving theoretical predictions.

Findings

Predicted branching ratio: 4.85×10^{-6}

CP violation approximately 5%

Results align with experimental data

Abstract

With only the tree level operator, the decay of $\Lambda_b\rightarrow pK$ is predicted to be one order smaller than the experimental data. The QCD penguin effects should be taken into account. In this paper, we explore the one-loop QCD corrections to the decay of $\Lambda_b\to pK$ within the framework of QCD factorization approach. For the baryon system, the diquark approximation is adopted. The transition hadronic matrix elements between $\Lambda_b$ and $p$ are calculated in the light front quark model. The branching ratio of $\Lambda_b\rightarrow pK$ is predicted to be about $4.85\times 10^{-6}$ which is consistent with experimental data $(4.9\pm 0.9)\times 10^{-6}$. The CP violation is about 5\% in theory.