Abstract
We estimate model independent bounds that could be obtained on the anomalous ZZH vertex using polarization parameters of the Z boson produced in the Higgstrahlung process at the LHC. We calculate the eight independent polarization parameters from the spin density matrix elements of the Z, which can probe underlying new physics contributions to ZH production. By using the approach that connects these polarization observables to the coefficients in the angular distribution of the decay products of the Z, we estimate the limits on the anomalous ZZH coupling that can be obtained at the 14 TeV LHC.
Highlights
In the absence of evidence so far of any definitive beyond the Standard Model (SM) physics at the Large Hadron Collider (LHC), it becomes important to probe with high precision the properties of the 125 GeV Higgs (H) at the planned high luminosity phase of the LHC (HL-LHC)
The measurement of couplings of the Higgs Boson to all other SM particles is an essential test of the SM
We study the form and magnitude of the tensor structure of the couplings of the Higgs boson to a pair of Z bosons at the LHC with the help of the polarization observables of the Z
Summary
In the absence of evidence so far of any definitive beyond the Standard Model (SM) physics at the Large Hadron Collider (LHC), it becomes important to probe with high precision the properties of the 125 GeV Higgs (H) at the planned high luminosity phase of the LHC (HL-LHC). The 68% confidence level (CL) upper bounds on the ZZH couplings, assuming them to be real, in our notation translate to |Re bZ| < 0.058 and |RebZ| < 0.078 These limits are obtained from measurements of ratios of the cross section contributions arising from the different ZZH couplings. The possibility of a future Large Hadron electron Collider (LHeC) to probe anomalous ZZH couplings has been studied in [31], where weak limits are found, viz., −0.21 < bZ < 0.43 and −0.32 < ̃bZ < 0.32 for an electron beam energy of 60 GeV and mild improvement for a beam energy of 140 GeV, with proton beam energy of 7 TeV in either case
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