CP violation in $h\to \tau \tau$ and LFV $h\to \mu \tau$

Abstract

The CMS collaboration has reported a possible lepton flavour violating (LFV) signal $h\to \mu \tau$. Whereas this does not happen in the standard model (SM), we point out that new physics responsible for this type of decay would, in general, also produce charge-parity (CP) violation in $h\to \tau \tau$. We estimate the size of this effect in a model independent manner and find that a large asymmetry, of order 25\%, is allowed by current constraints.

Comments: RevTex, 6 pages with one figure. Typos corrected and figure updated