2016/01/31 by Zhi-Hui Guo, J. A. Oller · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Algorithm #Artificial intelligence #Atomic and Subatomic Physics Research #Computer science #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-lat #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.93.054014
published as Phys. Rev. D 93 (2016) 054014 · 22 pages, 6 figures. To match the published version in Phys.Rev.D
openalex publication_date 2016/03/09 · arxiv created 2016/03/11 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A dedicated study of the \ensuremathπ\mathrm\ensuremathΣc scattering around its threshold is carried out in this work to probe the nature of \mathrm\ensuremathΛc(2595)+. We first demonstrate that the effective range expansion approach fails to work near the \mathrm\ensuremathΛc(2595)+ pole position, due to the presence of a nearby Castillejo-Dalitz-Dyson (CDD) pole around the \ensuremathπ\mathrm\ensuremathΣc thresholds. We then develop a general framework to properly handle the situation with a CDD pole accompanied by nearby thresholds, which is first elaborated for the single-channel case and then generalized to the coupled-channel study. The isospin-breaking effects of the three \ensuremathπ\mathrm\ensuremathΣc channels with different thresholds are specially taken into account in our study. The finite-width effects from the \mathrm\ensuremathΣc baryons are considered and found to be relevant to give the \mathrm\ensuremathΛc(2595)+ width fully compatible with its experimental value. Through the compositeness analysis, our robust conclusion is that the \ensuremathπ0\mathrm\ensuremathΣc+ component is subdominant inside the \mathrm\ensuremathΛc(2595)+.