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Anatomy of the pQCD Approach to the Baryonic Decays $\Lambda_b \to p\pi, p K$ by Lu, Cai-Dian; Wang, Yu-Ming; Zou, Hao; Ali, Ahmed; Kramer, Gustav is a scholarly article available to read on EtoBox.

What is Anatomy of the pQCD Approach to the Baryonic Decays $\Lambda_b \to p\pi, p K$ about?

We calculate the CP-averaged branching ratios and CP-violating asymmetries for the two-body charmless hadronic decays $\Lambda_b \to p \pi, pK$ in the perturbative QCD (pQCD) approach to lowest order in $\alpha_s$. The baryon distribution amplitudes involved in the factorization formulae are considered to the leading twist accuracy and the distribution amplitudes of the proton are expanded to the next-to-leading conformal spin (i.e., "P" -waves), the moments of which are determined from QCD sum rules. Our work shows that the contributions from the factorizable diagrams in $\Lambda_b \to p \pi, pK$ decays are much smaller compared to the non-factorizable diagrams in the conventional pQCD approach. We argue that this reflects the estimates of the $\Lambda_b \to p$ transition form factors in the $k_T$ factorization approach, which are found typically an order of magnitude smaller than those estimated in the light-cone sum rules and in the non-relativistic quark model. As an alternative, we adopt a hybrid pQCD approach, in which we compute the factorizable contributions with the $\Lambda_b \to p$ form factors taken from the light cone QCD sum rules. The non-factorizable diagrams are ev

Author

Lu, Cai-Dian; Wang, Yu-Ming; Zou, Hao; Ali, Ahmed; Kramer, Gustav

Published

2009

Language

EN