Strong decays of charmed baryons in heavy hadron chiral perturbation theory

2006/10/31 by Hai-Yang Cheng, Chun-Khiang Chua · 156 citations
Physics and Astronomy · #Baryon #Charmed baryons #Chiral perturbation theory #Excited state #Hadron #High-Energy Particle Collisions Research #Lambda #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark model #Quarkonium #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.75.014006

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 75(1) (American Physical Society) · 22 pages, the coupling g_2 is slightly modified, Tables 5 and 6 are updated; version to appear in PRD

arxiv created 2006/12/20 · openalex publication_date 2007/01/08 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Strong decays of charmed baryons are analyzed in the framework of heavy hadron chiral perturbation theory (HHChPT) in which heavy quark symmetry and chiral symmetry are synthesized. HHChPT works excellently for describing the strong decays of s-wave charmed baryons. For L=1 orbitally excited states, two of the unknown couplings, namely, h₂ and h₁₀, are determined from the resonant \ensuremathΛ_c⁺\ensuremathπ\ensuremathπ mode produced in the \ensuremathΛ_c(2593) decay and the width of \ensuremathΣ_c(2800), respectively. Predictions for the strong decays of the p-wave charmed baryon states \ensuremathΛ_c(2625), \ensuremathΞ_c(2790) and \ensuremathΞ_c(2815) are presented. Since the decay \ensuremathΛ_c(2593)⁺\ensuremath→\ensuremathΛ_c⁺\ensuremathπ\ensuremathπ receives nonresonant contributions, our value for h₂ is smaller than the previous estimates. We also discuss the first positive-parity excited charmed baryons. We conjecture that the charmed baryon \ensuremathΛ_c(2880) with J^P=(5)/(2)\genfrac0+ is an admixture of \ensuremathΛ_c2((5)/(2)\genfrac0+) with an \stackrel\texttildelow\ensuremathΛ_c3^\ensuremath'\ensuremath'((5)/(2)\genfrac0+); both are L=2 orbitally excited states. The potential model suggests J^P=(5)/(2)\genfrac0\ensuremath- or (3)/(2)\genfrac0+ for \ensuremathΛ_c(2940)⁺. Measurements of the ratio of \ensuremathΣ_c^*\ensuremathπ/\ensuremathΣ_c\ensuremathπ will enable us to discriminate the J^P assignments for \ensuremathΛ_c(2940). We advocate that the J^P quantum numbers of \ensuremathΞ_c(2980) and \ensuremathΞ_c(3077) are (1)/(2)\genfrac0+ and (5)/(2)\genfrac0+, respectively. Under this J^P assignment, it is easy to understand why \ensuremathΞ_c(2980) is broader than \ensuremathΞ_c(3077).

Citations

• Production, decay, and polarization of excited heavy hadrons
• Strong and radiative decays of heavy flavored baryons
• Light quark spin-flavor symmetry for baryons containing a heavy quark in large N QCD
• Review of Particle Physics

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