26-31 July 2021
Mexico City
Mexico/General timezone
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Contribution Leading parallel

Mexico City -
Exotic Hadrons and Candidates

A triangle singularity as the origin of the a1(1420)


  • Mathias WAGNER

Primary authors


we have shown that the recently discovered resonance-like signal $a_1(1420)$ can be fully explained by the decay of the ground-state $a_1(1260)$ into $K^*\bar{K}$ and subsequent rescattering through a triangle singularity into the observed final state $f_0(980)\pi$ without the need of a new genuine $a_1$ resonance. The effect of the triangle singularity, which is expected to be present, is sufficient to explain the observation.