1996/02/09 by Jonathan L. Rosner · 1 citation
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ph
paper · pdf · doi:10.1016/0370-2693(96)00352-8
published as Phys.Lett. B379 (1996) 267-271 · 7 pages, latex, no figures
arxiv created 1996/02/09 · openalex publication_date 1996/06/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The enhancement ΔΓ(Λb) of the Λb decay rate due to four-fermion processes of weak scattering and Pauli interference is calculated within the quark model. An estimate of the relative bu wave function at zero separation, |Ψ(0)|2bu, is obtained in terms of the Σb^* - Σb hyperfine splitting, the B^* - B hyperfine splitting, and the B meson decay constant fB. For M(Σb^*) - M(Σb) = 56 ± 16 MeV, M(B^*) - M(B) = 46 MeV, and fB = 190 ± 40 MeV, we find ΔΓ(Λb) = (0.025 ± 0.013) ps-1, to be compared with the observed enhancement Γ(Λb) - Γ(B0) = 0.20 ± 0.05 ps-1. Even such a meager enhancement entails a value of |Ψ(0)|2bu considerably larger than the corresponding value of |Ψ(0)|2cd in the Λc baryon.