Implications of isospin conservation in Λb decays and lifetime

1998/09/30 by Alakabha Datta, Harry J. Lipkin, Patrick O’Donnell +1 · 7 citations
Physics and Astronomy · #Atomic physics #Baryon #High-Energy Particle Collisions Research #Hyperfine structure #Hyperon #Isospin #Lambda #Lambda baryon #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Pentaquark #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Strangeness #hep-ex #hep-ph

paper · pdf · doi:10.1016/s0370-2693(99)00139-2

published in Physics Letters B 450(1-3), 250-256 (Elsevier BV) · Changes in abstract and introduction. To appear in Phys.Lett. B. Latex 12 pages, no figures

arxiv created 1999/01/29 · openalex publication_date 1999/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We consider isospin predictions for the semi-leptonic and non-leptonic decays of the Λ_b baryon. Isospin conservation of the strong interactions constrains the possible final states in Λ_b decays. Since the baryon hyperfine splittings depend upon light quark dynamics and do not decrease with increasing heavy quark mass, this leads in general to to phase space enhancements in Λ_b decays relative to B meson decays for the same underlying quark transitions. Consequently the Λ_b lifetime is smaller than the B lifetime. Phase space enhancements in Λ_b decays relative to B decays can be understood in terms of hyperfine interactions in the heavy quark system.

Citations

• Failure of local duality in inclusive non-leptonic heavy flavour decays
• Heavy baryon transitions in a relativistic three-quark model
• Enhancement of the Λ decay rate
• Review of Particle Physics

Cited by

• NonleptonicΛbdecays toDs(2317),Ds(2460),and other final states in factorization