Study of the a1 (1269) resonance in the γp →π+π+π-n reaction Supported by the National Natural Science Foundation of China (11475227, 11735003), and the Youth Innovation Promotion Association CAS (2016367)

Zhang, Xu ( Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China) ( University of Chinese Academy of Sciences, Beijing 101408, China) ; Xie, Ju-Jun ( Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China) ( University of Chinese Academy of Sciences, Beijing 101408, China)

20 May 2019

Abstract: Within an effective Lagrangian approach and resonance model, we study the and reactions via the -exchange mechanism. For the reaction, we perform a calculation of the differential and total cross-sections by considering the contributions of the intermediate resonance decaying into and then into . Besides, the non-resonance process is also considered. With a lower mass of , the experimental data for the invariant mass distributions can be fairly well reproduced. For the reaction, with the model parameters, the total cross-section is of the order of 10 μb at the photon beam energy ~2.5 GeV. It is expected that the model calculations in this work could be tested by future experiments.


Published in: Chinese Phys. C 43 (2019) 064104
Published by: Institute of Physics Publishing/Chinese Academy of Sciences
DOI: 10.1088/1674-1137/43/6/064104
arXiv: 1812.04242
License: CC-BY-3.0



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