Alladi Ramakrishnan Hall

Constraining wrong-sign hbb coupling with Higgs to Upsilon gamma decay

Soumya Sadhukhan

PRL

The rare decay h to \Upsilon \gamma 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 that of the Standard model; so called wrong-sign solution. We show how h to \Upsilon \gamma channel can be used to put limits on the wrong-sign solutions.