Flavor violating Higgs decays

Harnik, Roni; Kopp, Joachim; Zupan, Jure

doi:10.1007/JHEP03(2013)026

Title: Flavor violating Higgs decays

Journal Article · Fri Mar 01 00:00:00 EST 2013 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP03(2013)026· OSTI ID:1406540

Harnik, Roni; Kopp, Joachim; Zupan, Jure

We study a class of nonstandard interactions of the newly discovered 125 GeV Higgs-like resonance that are especially interesting probes of new physics: flavor violating Higgs couplings to leptons and quarks. These interaction can arise in many frameworks of new physics at the electroweak scale such as two Higgs doublet models, extra dimensions, or models of compositeness. We rederive constraints on flavor violating Higgs couplings using data on rare decays, electric and magnetic dipole moments, and meson oscillations. We confirm that flavor violating Higgs boson decays to leptons can be sizeable with, e.g., h → τμ and h → τe branching ratios of (10%) perfectly allowed by low energy constraints. We estimate the current LHC limits on h → τμ and h → τe decays by recasting existing searches for the SM Higgs in the ττ channel and find that these bounds are already stronger than those from rare tau decays. We also show that these limits can be improved significantly with dedicated searches and we outline a possible search strategy. Flavor violating Higgs decays therefore present an opportunity for discovery of new physics which in some cases may be easier to access experimentally than flavor conserving deviations from the Standard Model Higgs framework.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1406540

Report Number(s):: FERMILAB-PUB-12-498-T; arXiv:1209.1397; 1184810

Journal Information:: Journal of High Energy Physics (Online), Vol. 2013, Issue 3; ISSN 1029-8479

Publisher:: Springer Berlin

Country of Publication:: United States

Language:: English

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