The rare decay h→Υγ has a very small rate in the Standard Model, due to a strong cancellation between the direct and indirect diagrams. Models with a changed hbb coupling can thus lead to a great increase in this decay. Current limits on two Higgs doublet models still allow for the possibility that the hbb coupling might have a sign opposite to the Standard Model; the so-called "wrong-sign". We show how h→Υγ can be used to put limits on the wrong-sign solutions.
@article{arxiv.1607.07876,
title = {Constraining wrong-sign $hbb$ couplings with $h \rightarrow \Upsilon \gamma$},
author = {Tanmoy Modak and Jorge C. Romão and Soumya Sadhukhan and João P. Silva and Rahul Srivastava},
journal= {arXiv preprint arXiv:1607.07876},
year = {2016}
}