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.

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

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• 125 GeV Higgs decay with lepton flavor violation in the $\mu \nu$SSM
• Higgs boson decays with lepton flavor violation in the $B-L$ symmetric SSM
• Yukawa sector for LFV in $h\to \mu \tau$ and CP violation in $h\to \tau \tau$
• Probing the CP-Violation effects in the $h\tau \tau$ coupling at the LHC
• Flavor-Changing Higgs Decays in Grand Unification with Minimal Flavor Violation
• Constraints and Implications on Higgs FCNC Couplings from Precision Measurement of $B_s\to {\mu }^{+}{\mu }^{-}$ Decay
• The Higgs program and open questions in particle physics and cosmology
• Exploring CP phase in $\tau$-lepton Yukawa coupling in Higgs decays at the LHC