Abstract
A search for anomalous pseudoscalar couplings of the Higgs boson H to electroweak vector bosons V (= W or Z) in a sample of proton-proton collision events corresponding to an integrated luminosity of 18.9 inverse femtobarns at a center-of-mass energy of 8 TeV is presented. Events consistent with the topology of associated VH production, where the Higgs boson decays to a pair of bottom quarks and the vector boson decays leptonically, are analyzed. The consistency of data with a potential pseudoscalar contribution to the HVV interaction, expressed by the effective pseudoscalar cross section fractions f[a3], is assessed by means of profile likelihood scans. Results are given for the VH channels alone and for a combined analysis of the VH and previously published H to VV channels. Under certain assumptions, f[a3](ZZ) > 0.0034 is excluded at 95% confidence level in the combination. Scenarios in which these assumptions are relaxed are also considered.
Highlights
The observation of a new boson [1,2,3] with a mass around125 GeV and properties consistent with those of the standard model (SM) Higgs boson [4,5,6,7,8,9,10] has ushered in a new era of precision Higgs physics
This dataset represents the expectation for an SM Higgs boson in the asymptotic limit of large statistics
A search has√been performed for anomalous pseudoscalar HVV interactions in s = 8 TeV pp data collected with the CMS detector
Summary
125 GeV and properties consistent with those of the standard model (SM) Higgs boson [4,5,6,7,8,9,10] has ushered in a new era of precision Higgs physics. It is interesting to consider models where the ratio of the Hbb and Htt coupling strengths in the VH and H → VV processes is not affected by the presence of anomalous contributions [21]. In such a case, it is possible to relate the cross sections of the two processes for arbitrary anomalous HVV couplings and perform a combined analysis of the VH and H → VV processes, exploiting both kinematics and the relative signal strengths of the two processes. Where σij is the production cross-section for process j with aHi VV = 1 and all other couplings assumed to be equal to zero. The dependence on the pp → H cross-section cancels
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