Abstract
Using the Nambu–Jona-Lasinio model with the chiral symmetric effective four-quark interactions, we derive the amplitude of the radiative decay , find the decay width and obtain the spectral dipion effective mass distribution. It is shown that in contrast to the majority of theoretical estimates (which consider the meson exchange as the dominant one), the most relevant contribution to this process is the -resonance exchange related with the triangle anomaly. The spectral function is obtained to be confronted with the future empirical data.
- Received 25 January 2018
DOI:https://doi.org/10.1103/PhysRevD.97.074020
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society