Effective gauge-Higgs operators analysis of new physics associated with the Higgs boson

Abstract

We study the new physics(NP) related to the recent discovered 125 GeV Higgs by employing an important subset of the standard model(SM) gauge invariant dimension-six operators constructed by the the SM Higgs and gauge fields. Explicitly, we perform a model-independent study on the production and decays of the Higgs, the electric dipole moments(EDMs) of the neutron and the electron, and we take into account the anomalous magnetic dipole moments of muon and electron as well. We find that, even all Higgs decay channels agree with the SM predictions, the SM theoretical uncertainties provide a lot of room to host NP associated with the 125 GeV boson. A linear relation is revealed in our numerical study that µ ZZ ≃ µ W W and 0.6 µ ZZ,W W 1.4 at 95%CL with or without the EDMs constraints. The neutron and electron EDMs severely constrain the relevant Wilson coefficients. Therefore the CP violating components in the h → W W, ZZ channels are too small, ∼ O(10 −5 ), to be detected at the LHC. However, we point out that even the parity of the 125GeV boson has been largely determined to be even in the h → ZZ channel, one should pay special attention to the potentially large CP violation in the h → γγ and h → γZ channels. This should be seriously checked in the future spin correlation experiments.

Complete Higgs sector constraints on dimension-6 operators

“…Constraints on these operators have been placed for subsets of operators [80][81][82][83][84][85][86][87][88][89] and in full global fits both before [90] and after [91][92][93] the Higgs discovery. 2 Many strong constraints come from electroweak precision tests (EWPT) [94][95][96] at LEP, and from triplegauge coupling (TGC) [91,92,97] measurements at LEP and the LHC.…”

Probing $$\textit{CP}$$-violating Higgs and gauge-boson couplings in the Standard Model effective field theory

“…7, we show, in the upper panel, the distribution in the transverse mass of the lepton and the reconstructed Higgs-boson system, M T ( , H ), and the angular separation in azimuth between the lepton and the missing transverse momentum Δφ( , / p T ) (lower panel), this last observable being defined similarly to Eq. (27).…”

“…As far as gauge interactions are concerned, CPV effects can be parameterized by six independent dimensions-six operators yielding novel interactions involving at least either three gauge and Higgs bosons, or gauge bosons only. The magnitude of the corresponding Wilson coefficients is in general constrained by electric dipole moments data and electroweak precision tests [16,[22][23][24], as well as by fits of Higgs coupling measurements at the LHC [25][26][27][28][29].…”

Higgs pair productions in the CP-violating two-Higgs-doublet model

“…The LHC signal strengths of the SM-like Higgs boson in the presence of the CPV were discussed in refs. [52][53][54][68][69][70][71][72][73][74][75]. …”