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

2016

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

Hayreter, Alper, He, Xiao-Gang, Valencia, German

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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.

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