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The European Physical Journal C

, Volume 59, Issue 4, pp 861–882 | Cite as

Rare decays of Λ b Λ+γ and Λ b Λ+l + l in the light-cone sum rules

  • Yu-Ming WangEmail author
  • Ying Li
  • Cai-Dian Lü
Regular Article - Theoretical Physics

Abstract

The weak decays of Λ b Λ+γ and Λ b Λ+l + l are investigated in the standard model using the light-cone sum-rule approach. The higher-twist distribution amplitudes of the Λ baryon to the leading conformal spin are included in the sum rules for the transition form factors. Our results indicate that the higher-twist distribution amplitudes almost have no influence on the transition form factor f 2(q 2) defined by the tensor current, while such corrections can have a significant impact on the form factors g 2(q 2) defined by a vector current. Two phenomenological models (COZ and FZOZ) for the wave function of the Λ baryon are also employed in the sum rules for comparison, which can give rise to form factors approximately five times larger than that in terms of conformal expansion. Utilizing the form factors calculated in LCSR, the physical observables like the decay rate, the polarization asymmetry and forward–backward asymmetry are analyzed for the decays of Λ b Λ γ, Λ l + l .

Keywords

Form Factor Distribution Amplitude Branching Ratio Transition Form Factor Polarization Asymmetry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag / Società Italiana di Fisica 2009

Authors and Affiliations

  1. 1.Institute of High Energy Physics and Theoretical Physics Center for Science FacilitiesCASBeijingChina
  2. 2.Physics DepartmentYantai UniversityYantaiChina

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