Rare Λb→Λι+ι- decays with polarized Λ

Chuan-Hung Chen, C. Q. Geng

Research output: Contribution to journalArticlepeer-review


We investigate the rare baryonic exclusive decays of Λb→Λι+ι- (ι=e, μ, τ) with polarized Λ. Under the approximation of the heavy quark effective theory, in the standard model we derive the differential decay rates and various polarization asymmetries by including lepton mass effects. We find that with the long-distance effects the decay branching ratios are 5.3×10-5 for Λb→Λι+ι- (ι=e, μ) and 1.1×10-5 for Λb→Λτ+τ- The effects of new physics in the decay rates are also. discussed. The integrated longitudinal Λ polarizations are -0.31 and -0.12, while that of the normal ones 0.02 and 0.01, for di-muon and tau modes, respectively. The CP-odd transverse polarization of Λ is zero in the standard model but it is expected to be sizable in some theories with new physics.

Original languageEnglish
Article number114024
Pages (from-to)1140241-1140249
Number of pages9
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number11
Publication statusPublished - 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics


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