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Heavy Baryonic Decays of Λ_b \to Λη^{(\prime)} and Nonspectator Contribution

M. R. Ahmady·C. S. Kim·Sechul Oh·Chaehyun Yu
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Abstract

We calculate the branching ratios of the hadronic Λ_b decays to ηand η^\prime in the factorization approximation where the form factors are estimated via QCD sum rules and the pole model. Our results indicate that, contrary to B\to Kη^{(\prime)} decays, the branching ratios for Λ_b\toΛηand Λ_b\toΛη^\prime are more or less the same in the hadronic Λ_b transitions. We estimate the branching ratio of Λ_b\toΛη^{(\prime)} to be 10.80 (10.32)\times 10^{-6} in QCD sum rules, and 2.78 (2.96)\times 10^{-6} in the pole model. We also estimate the nonfactorizable gluon fusion contribution to Λ_b\toΛη^\prime decay by dividing this process into strong and weak vertices. Our results point to an enhancement of more than an order of magnitude due to this mechanism.

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M. R. Ahmady, C. S. Kim, Sechul Oh, Chaehyun Yu. 2003-05-03. Heavy Baryonic Decays of Λ_b \to Λη^{(\prime)} and Nonspectator Contribution. https://doi.org/10.1016/j.physletb.2004.07.048

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