Abstract
A set of exclusive decay of the Higgs boson into a vector meson and a dilepton pair (h → Vℓ+ ℓ−, with V = ϒ, J/ψ, ϕ, and ℓ = μ, τ) are studied in the framework of the Standard Model. We have evaluated the decay rates, the dilepton mass spectra and the V longitudinal helicity fraction distributions. In the same framework, we considered the exclusive modes h → Vvv̄ and the implications of the CMS and ATLAS results for the lepton flavor-changing process h → τ+ μ− on the h → Vτ+ μ− decay modes.
Highlights
The Higgs-like scalar observed at LHC with mh = 125.7(4) GeV [1,2,3] seems to fulfilled the prediction of the Standard Model (SM) for the Higgs boson
The couplings of the Higgs to leptons are present in the diagrams of Fig. 1 (b), with the qqpair emitted by the photon or Z
We report the various expressions in correspondence with the diagrams in Fig. 1(a), (b) and (c), considering separately the intermediate photon and Z contributions
Summary
The Higgs-like scalar observed at LHC with mh = 125.7(4) GeV [1,2,3] seems to fulfilled the prediction of the Standard Model (SM) for the Higgs boson. It is important to confirm that the couplings of the observed state to the fermions and gauge bosons are what the SM dictates. The couplings of the observed scalar to top and beauty quarks and to τ leptons are very well studied and are consistent with the SM predictions [4]; less known are the couplings to the light quarks and leptons. The study of the couplings to the first two generation of fermions is an experimental difficult job.
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