Λb→ΛJ/ψ decay in perturbative QCD

Chung Hsien Chou, Hsien Hung Shih, Shih Chang Lee, Hsiang Nan Li

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Abstract

We calculate, the amplitudes involved in the heavy baryon nonleptonic decay Λb→ΛJ/ψ using perturbative QCD factorization theorem, which is expressed as convolutions of hard b quark decay amplitudes with the Λb baryon, Λ baryon, and J/ψ meson distribution amplitudes. It is found that nonfactorizable contributions dominate over factorizable ones. Because of the soft cancellation in pairs of nonfactorizable diagrams, the Λb→ΛJ/ψ decay is characterized by a large scale, such that perturbative QCD is applicable. Employing the distribution amplitudes determined in our previous works and from QCD sum rules, we derive the branching ratio B(Λb→ΛJ/ψ)=(1.7-5.3)×1O-4 in agreement with data. We predict an asymmetry parameter α = -0.17 to -0.14 associated with the anisotropic angular distribution of the Λ baryons produced in polarized Λb baryon decays.

Original languageEnglish
Article number074030
Pages (from-to)740301-7403015
Number of pages6662715
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume65
Issue number7 B
DOIs
StatePublished - 1 Apr 2002

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