Role of the Δ*(1940) in the π+pK+Σ+(1385) and ppnK+Σ+(1385) reactions

Ju-Jun Xie, En Wang, and Bing-Song Zou
Phys. Rev. C 90, 025207 – Published 14 August 2014

Abstract

The ppnK+Σ+(1385) reaction is a very good isospin 3/2 filter for studying Δ++* resonance decaying to K+Σ+(1385). Within the effective Lagrangian method, we investigate the Σ(1385) (spin parity JP=3/2+) hadronic production in the π+pK+Σ+(1385) and ppnK+Σ+(1385) reactions. For the π+pK+Σ+(1385) reaction, in addition to the “background” contributions from t-channel K*0 exchange and u-channel Λ(1115) and Σ0(1193) exchange, we also consider the contribution from the s-channel Δ*(1940) resonance, which has significant coupling to the KΣ(1385) channel. We show that the inclusion of the Δ*(1940) resonance leads to a fairly good description of the low-energy experimental total cross section data of π+pK+Σ+(1385) reaction. Basing on the study of the π+pK+Σ+(1385) reaction and with the assumption that the excitation of Δ*(1940) resonance dominates the ppnK+Σ+(1385) reaction, we calculate the total and differential cross sections of the ppnK+Σ+(1385) reaction. It is shown that the new experimental data support the important role played by the Δ*(1940) resonance with a mass in the region of 1940 MeV and a width of around 200 MeV. We also demonstrate that the invariant mass distribution and the Dalitz plot provide direct information of the Σ+(1385) production, which can be tested by future experiments.

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  • Received 21 May 2014
  • Revised 17 July 2014

DOI:https://doi.org/10.1103/PhysRevC.90.025207

©2014 American Physical Society

Authors & Affiliations

Ju-Jun Xie1,2,3,*, En Wang4,†, and Bing-Song Zou3,‡

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, Lanzhou 730000, China
  • 3State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Apartado 22085, E-46071 Valencia, Spain

  • *xiejujun@impcas.ac.cn
  • En.Wang@ific.uv.es
  • zoubs@itp.ac.cn

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Issue

Vol. 90, Iss. 2 — August 2014

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