Electromagnetic trace anomaly in a generalized linear sigma model
Abstract
We build the electromagnetic trace anomaly effective term for a generalized linear sigma model with two chiral nonets, one with a quark-antiquark structure, the other one with a four quark content. In the leading order of this framework, we study the decays into two photons of the lowest isosinglet scalar mesons. We find that the direct inclusion of underlying mixing among two- and four-quark components in the trace anomaly term is essential in order for the model prediction to agree with the available experimental data on decay width of to two photons. Consequently, this sets a lower bound of 0.5 KeV on the decay with of to two photons.
Cite
@article{arxiv.1709.01834,
title = {Electromagnetic trace anomaly in a generalized linear sigma model},
author = {Amir H. Fariborz and Renata Jora},
journal= {arXiv preprint arXiv:1709.01834},
year = {2017}
}
Comments
7 pages, 2 figures, version accepted for publication in Phys. Rev. D. arXiv admin note: text overlap with arXiv:1407.3870