Leading Isgur–Wise form factor of Λ→Λ1 transition using QCD sum rules

2000/12/11 by Ming-Qiu Huang, Jong-Phil Lee, Chun Liu +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph

paper · pdf · doi:10.1016/s0370-2693(01)00035-1

published as Phys.Lett. B502 (2001) 133-139 · 16 pages, 3 figures, to appear in PLB

arxiv created 2000/12/11 · openalex publication_date 2001/03/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The leading Isgur-Wise form factor ξ(y) parametrizing the semileptonic transitions Λ_b→Λ^1/2_c1ℓν and Λ_b→Λ^3/2_c1ℓν is calculated by using the QCD sum rules in the framework of heavy quark effective theory, where Λ^1/2_c1 and Λ^3/2_c1 is the orbitally excited charmed baryon doublet with J^P=(1^-/2,3^-/2). The interpolating currents with transverse covariant derivative are adopted for Λ^1/2_c1 and Λ^3/2_c1 in the analysis. The slope parameter ρ² in linear approximation of the Isgur-Wise function is obtained to be ρ²=2.01, and the interception to be ξ(1)=0.29. The decay branching ratios are estimated.

Cited by

• Excited heavy baryon masses to orderΛQCD/mQfrom QCD sum rules