Higgs decay into two photons, dispersion relations and trace anomaly
High Energy Physics - Phenomenology
2009-10-28 v1
Abstract
We examine the contribution of W boson loops to the amplitude of the process H --> \gamma \gamma within the dispersion relation approach, taking up an issue raised in this context recently. We show that the non-vanishing limit of the relevant formfactor for mW --> 0 is due to a finite subtraction induced by the value of the corresponding trace anomaly. The argument can be truned around and one thus arrives at a dispersive ("infrared") derivation of the trace anomaly.
Cite
@article{arxiv.hep-ph/9603320,
title = {Higgs decay into two photons, dispersion relations and trace anomaly},
author = {Jiri Horejsi and Miroslav Stohr},
journal= {arXiv preprint arXiv:hep-ph/9603320},
year = {2009}
}