Role of the possible Σ*(12) state in the ΛpΛpπ0 reaction

Ju-Jun Xie, Jia-Jun Wu, and Bing-Song Zou
Phys. Rev. C 90, 055204 – Published 12 November 2014

Abstract

The ΛpΛpπ0 reaction near threshold is studied within an effective Lagrangian method. The production process is described by single-pion and single-kaon exchange. In addition to the role played by the Σ*(1385) resonance of spin-parity JP=3/2+, the effects of a newly proposed Σ* (JP=1/2) state with mass and width around 1380 MeV and 120 MeV are investigated. We show that our model leads to a good description of the experimental data on the total cross section of the ΛpΛpπ0 reaction by including the contributions from the possible Σ*(12) state. However, the theoretical calculations by considering only the Σ*(1385) resonance fail to reproduce the experimental data, especially for the enhancement close to the reaction threshold. On the other hand, it is found that the single-pion exchange is dominant. Furthermore, we also demonstrate that the angular distributions provide direct information of this reaction, hence could be useful for the investigation of the existence of the Σ*(12) state and may be tested by future experiments.

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  • Received 1 August 2014

DOI:https://doi.org/10.1103/PhysRevC.90.055204

©2014 American Physical Society

Authors & Affiliations

Ju-Jun Xie1,2,3,*, Jia-Jun Wu4, 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
  • 4Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *xiejujun@impcas.ac.cn
  • zoubs@itp.ac.cn

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Issue

Vol. 90, Iss. 5 — November 2014

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