Rare and exclusive few-body decays of the Higgs, Z, W bosons, and the top quark

Abstract

We perform an extensive survey of rare and exclusive few-body decays -- defined as those with branching fractions $\mathcal{B}\lesssim 10^{-5}$ into two to four final particles -- of the Higgs, Z, W bosons, and the top quark. Such rare decays can probe physics beyond the Standard Model (BSM), constitute a background for exotic decays into new BSM particles, and provide precise information on quantum chromodynamics factorization with small nonperturbative corrections. We tabulate the theoretical $\mathcal{B}$ values for about 200 rare decay channels of the four heaviest elementary particles, indicating the current experimental limits in their observation. Among those, we have computed for the first time ultrarare Higgs boson decays into photons and/or neutrinos, H and Z radiative decays into leptonium states, radiative H and Z quark-flavour-changing decays, and semiexclusive top-quark decays into a quark plus a meson, while updating predictions for a few other rare H, Z, and top quark partial widths. The feasibility of measuring each of these unobserved decays is estimated for p-p collisions at the high-luminosity Large Hadron Collider (HL-LHC), and for $e^{+}{e}^{-}$ and p-p collisions at the future circular collider (FCC).

63 pages, 35 figs, 27 tables. Final version slightly more up-to-date than the published one (a few typos corrected, added a few more decay rates and refs.,...)

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Cited by in corpus (8)

• Production of dileptonic bound states in the Higgs boson decay
• Up-type FCNC in presence of Dark Matter
• Rare few-body decays of the Standard Model Higgs boson
• Search for rare decays of the Z and Higgs bosons to a J/$\psi$ or $\psi$(2S) meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for the Higgs boson decays to a ${\rho }^0$, $\varphi$, or K${}^{\ast 0}$ meson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Searches for Power-Law Warped Extra Dimensions
• Lepton flavor violating top quark FCNC processes at the $\mu$TRISTAN
• Production of leptonium in heavy quarkonium decays