Combined analysis of the πpK0Λ, ηn reactions in a chiral quark model

Li-Ye Xiao, Fan Ouyang, Kai-Lei Wang, and Xian-Hui Zhong
Phys. Rev. C 94, 035202 – Published 2 September 2016

Abstract

A combined analysis of the reactions πpK0Λ and ηn is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to W1.8 GeV are reasonably described. For πpK0Λ, it is found that N(1535)S11 and N(1650)S11 play crucial roles near threshold. The N(1650)S11 resonance contributes to the reaction through configuration mixing with N(1535)S11. The constructive interference between N(1535)S11 and N(1650)S11 is responsible for the peak structure around threshold in the total cross section. The n-pole, u-, and t-channel backgrounds provide significant contributions to the reaction as well. For the πpηn process, the “first peak” in the total cross section is dominated by N(1535)S11, which has a sizeable destructive interference with N(1650)S11. Around Pπ1.0GeV/c (W1.7 GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the u channel and N(1650)S11. The N(1520)D13 resonance affects the angle distributions of the cross sections notably, although no obvious effects are seen in the total cross section. The role of P-wave state N(1720)P13 should be further confirmed by future experiments. If N(1720)P13 has a narrow width of Γ120 MeV as found in our previous work by a study of the π0 photoproduction processes, obvious evidence should be seen in the πpK0Λ and ηn processes as well. Finally, we give our predictions of the s-channel isospin-12 resonance contributions to the πNπN reactions.

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  • Received 16 February 2016
  • Revised 4 July 2016

DOI:https://doi.org/10.1103/PhysRevC.94.035202

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Li-Ye Xiao, Fan Ouyang, Kai-Lei Wang, and Xian-Hui Zhong*

  • Department of Physics, Hunan Normal University, Changsha 410081, China; Synergetic Innovation Center for Quantum Effects and Applications (SICQEA), Changsha 410081, China; and Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Changsha 410081, China

  • *zhongxh@hunnu.edu.cn

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Issue

Vol. 94, Iss. 3 — September 2016

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