Volume 310 -
XVII International Conference on Hadron Spectroscopy and Structure
(Hadron2017) -
Session 5: Analysis tools
The $a_1(1420)$ peak as the special decay mode of the $a_1(1260)$
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Pre-published on:
February 16, 2018
Published on:
March 20, 2018
Abstract
We study the mechanism of triangular singularity of the $a_1(1260)$ decay to $\pi^+f_0(980)$ within the chiral unitary approach. Our results provide a natural explanation of all the features observed in the COMPASS experiment. Therefore the $a_1(1420)$ cannot be accepted as a new resonance since conventional explanation for it has found. The present finding is rather remarkable example of how a decay mode of one resonance can peak at 200 MeV higher energy than the nominal resonance mass.
DOI: https://doi.org/10.22323/1.310.0143
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.