Abstract
We analyze the bounds on the Higgs pseudo-observables following from electroweak constraints, under the assumption that the Higgs particle is the massive excitation of an \(\text {SU}(2)_L\) doublet. Using such bounds, detailed predictions for \(h\rightarrow 4\ell \) decay rates, dilepton spectra, and lepton-universality ratios are presented.
Highlights
The decays of the Higgs particle, h(125), can be characterized by a set of pseudo-observables (PO) that describe, in great generality, possible deviations from the Standard Model (SM) in the limit of heavy New Physics (NP) [1]
In this paper we analyze the constraints following from the hypothesis that the Higgs particle is the massive excitation of a pure SU(2)L doublet, i.e. constraints and relations among the PO that hold in the so-called linear effective field theory (EFT) regime
In this paper we have presented a systematic evaluation of the bounds on the Higgs PO that follow from the EW constraints in the linear EFT regime, with particular attention to the PO appearing in h → 4 and h → 2 2ν decays
Summary
The decays of the Higgs particle, h(125), can be characterized by a set of pseudo-observables (PO) that describe, in great generality, possible deviations from the Standard Model (SM) in the limit of heavy New Physics (NP) [1] These PO should be considered as independent variables in the absence of specific symmetry or dynamical assumptions; relations among themselves and between Higgs and nonHiggs PO arise in specific NP frameworks. In order to precisely quantify the above statement, in this paper we present a systematic evaluation of the bounds on the Higgs PO following the EW constraints in the linear EFT regime, with particular attention to the PO entering both h → 4 and h → 2 2ν decays Using such bounds, we derive predictions for h → 4 decay rates, dilepton invariant-mass spectra, and lepton-universality ratios
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