Triangle singularity enhancing isospin violation in and decays
1 Department of Physics, Guangxi Normal University Guilin 541004, China
2 Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia - CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain
3 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Published online: 1 February 2019
We investigate isospin violation in the and reactions, which proceed via a triangle mechanism. We show that the mechanism develops a singularity around the π0f0(980) or π0a0(980) invariant mass of 1420 MeV where the π0f0 and π0a0 decay modes are magnified and also the ratio of π0f0 to π0a0 production, stressing the role of the triangle singularities as a factor to enhance isospin violation. The measurement of these reactions would bring further information into the role of triangle singularities in isospin violation and the a0 – f0 mixing in particular and shed further light into the nature of the low lying scalar mesons.
© The Authors, published by EDP Sciences, 2019
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