Flavour-Changing Decays of a 125 GeV Higgs-like Particle

By G. Blankenburg, John Ellis, G. Isidori. 2012

222 citations recorded by the source corpus.

Abstract The ATLAS and CMS experiments at the LHC have reported the observation of a possible excess of events corresponding to a new particle h with mass ∼125 GeV that might be the long-sought Higgs boson, or something else. Decyphering the nature of this possible signal will require constraining the couplings of the h and measuring them as accurately as possible. Here we analyze the indirect constraints on flavour-changing h decays that are provided by limits on low-energy flavour-changing interactions. We find that indirect limits in the quark sector impose such strong constraints that flavour-changing h decays to quark–antiquark pairs are unlikely to be observable at the LHC. On the other hand, the upper limits on lepton-flavour-changing decays are weaker, and the experimental signatures less challenging. In particular, we find that either B ( h → τ μ ¯ + μ ¯ τ ) or B ( h → τ e ¯ + e ¯ τ ) could be O ( 10 ) % , i.e., comparable to B ( h → τ + τ − ) and potentially observable at the LHC.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/205549477075c1e1e893953eface4b734a193088

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In Nuclear and High Energy Physics

Citations in the corpus

Flavor violating Higgs decays (2012, methodology): “In particular, the branching ratios for h → τμ and h → τe can reach up to 10% [24].”
Search for lepton-flavour-violating decays of the Higgs boson (2015, unknown): “It improves upon previously published indirect limits [4,26] by an order of magnitude.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, background): “The flavour violating Yukawa couplings are well constrained by the low-energy flavour-changing neutral current measurements [1344,1345,1371].”
Matching of gauge invariant dimension-six operators for b → s and b → c transitions (2015, background): “J H E P 0 5 ( 2 0 1 6 ) 0 3 7 Unlike in the pure dimension-four SM, the mass matrix and the quark-Higgs coupling cannot be diagonalized simultaneously: a flavor changing interaction between the SM Higgs and the quarks appears [51, 67, 68].”
Renormalization group evolution of the Standard Model dimension six operators II: Yukawa dependence (2013, unknown): “[14, 15].”
Constraints on CP-violating Higgs couplings to the third generation (2013, background): “Note that there could also be other contributions to the EDMs beyond the ones we discuss, for instance from complex flavor-violating couplings of the Higgs with the corresponding bounds given in [19–23].”
Charged Lepton Flavour Violation: An Experimental and Theoretical Introduction (2017, background): “A rather model-independent parametrisation of Higgs-induced CLFV effects is the following [86, 87, 88, 89]:”
Higgs Physics at the HL-LHC and HE-LHC (2019, background): “Moreover, the Higgs flavor violating couplings are strongly constrained by meson mixing [628, 627].”