Constraining wrong-sign $hbb$ couplings with $h \rightarrow \Upsilon \gamma$

Understand

The rare decay $h \rightarrow \Upsilon \gamma$ 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 the Standard Model; the so-called "wrong-sign".
• We show how $h \rightarrow \Upsilon \gamma$ can be used to put limits on the wrong-sign solutions.