Higgs decay h → μτ with minimal flavor violation

Abstract

Abstract:We consider the tentative indication of flavor-violating Higgs boson decay h → µτ recently reported in the CMS experiment within the framework of minimal flavor violation. Specifically, we adopt the standard model extended with the seesaw mechanism involving right-handed neutrinos plus effective dimension-six operators satisfying the minimal flavor violation principle in the lepton sector. We find that it is possible to accommodate the CMS h → µτ signal interpretation provided that the right-handed neutrinos couple to the Higgs boson in some nontrivial way. We take into account empirical constraints from other lepton-flavor-violating processes and discuss how future searches for the µ → eγ decay and µ → e conversion in nuclei may further probe the lepton-flavor-violating Higgs couplings.

Leptoquark induced rare decay amplitudesh→τ∓μ±andτCheung1, Keung2, Tseng3 2016Phys. Rev. D

“…from BaBar experiment [3] (2) at low energy. Indeed, there are a lot of theoretical activities [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] along this line of investigation. There were also a number of studies on LFV Higgs boson decays in literature [23].…”

Flavor-changing Higgs decays in grand unification with minimal flavor violation

“…Explicitly, 5 This was explicitly done for the leptonic operators in [57]. 6 The high degree of model dependency in the relationships among the s belonging to the different operators is well illustrated by the results of the papers in which address h → μτ in the contexts of various scenarios.…”

“…Then we look at constraints on the resulting flavor-changing Higgs couplings to quarks and leptons, focusing on the former, as the leptonic case has been treated in detail in Ref. [57] which shows that the CMS h → μτ signal interpretation can be explained under the MFV assumption provided that the right-handed neutrinos couple to the Higgs in some nontrivial way. In Sect.…”

Yukawa sector for lepton flavor violating inh→μτandCPviolation inhHayreter1, He2, Valencia3 2016Phys. Rev. DSelf Cite10040View full textAdd to dashboardCite

“…[35] κ e = (1 + ǫ e ) 2 +r 2 e ≤ 611 (38) Very recently, ATLAS has presented a new limit on Higgs decaying to muon pairs, limiting the signal strength µ S < 3.5 at 95% c.l. when combining runs 1 and 2 [36].…”

“…From Br(τ → µγ) exp < 4.4 × 10 −8 [37], the allowed range encompasses 2.0 × 10 −3 < g 2 hτ µ + g 2 hµτ < 3.3 × 10 −3 [38][39][40] and yields a weaker constraint than the CMS result quoted above.…”