Higgs CP Properties From Early LHC Data

Abstract

In this paper, we constrain CP violation in the Higgs sector using the measured signal strengths in the various Higgs search channels. To this end, we introduce a general parameterization for a resonance which is an admixture of a CP-even Higgs-like state and a CP-odd scalar. By performing a fit to the available data from the Tevatron and LHC experiments one obtains constraints on the mixing angle and the couplings of the resonance to Standard Model fields. Depending on the couplings, sizable mixing angles are still compatible with the data, but small mixing is in general preferred by the fit. In particular we find that a pure CP-odd state is disfavored by the current data at the 3 sigma level. Additionally we consider a mixed fermiophobic resonance and a model with two degenerate mixed resonances and find that both scenarios can successfully fit the data within current errors. Finally, we estimate that the mixing angle can be constrained to α< 1.1 (0.7) in the full 8 TeV (14 TeV) run of the LHC.

18 pages, 5 figures; v2: references added and minor typos fixed

References in corpus (13)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Complex Singlet Extension of the Standard Model
• Evidence for a particle produced in association with weak bosons and decaying to a bottom-antibottom quark pair in Higgs boson searches at the Tevatron
• Anomalous Higgs boson couplings in vector boson fusion at the CERN LHC
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• Determining the CP parity of Higgs bosons at the LHC in the $\tau$ to 1-prong decay channels
• Pseudoscalar Higgs Bosons at the LHC: Production and Decays into Electroweak Gauge Bosons Revisited
• Single-variable asymmetries for measuring the `Higgs' boson spin and CP properties
• Telling the spin of the "Higgs boson" at the LHC
• Multi-Photon Signals from Composite Models at LHC
• Distinguishing `Higgs' Spin Hypotheses using gamma gamma and WW* Decays
• Z boson decay to photon plus Kaluza-Klein graviton in large extra dimensions

Cited by in corpus (2)

• Spin-2 Resonances in Vector-Boson-Fusion Processes at NLO QCD
• Dynamical symmetry breaking, CP violation, and a Higgs-like particle