University of Illinois at Chicago
PhysRevD.87.055014.pdf (996.73 kB)
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Higgs CP properties from early LHC data

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journal contribution
posted on 2014-02-20, 00:00 authored by A. Freitas, P. Schwaller
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 parametrization 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 alpha < 1: 1 (0.7) in the full 8 TeV (14 TeV) run of the LHC.


This project was supported in part by the National Science Foundation under Grant No. PHY-1212635, and by the U.S. Department of Energy, Division of High Energy Physics, under Contracts No. DE-AC02- 06CH11357 and No. DE-FG02-12ER41811.


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This is a copy of an article published in the Physical Review D © 2013 American Physical Society. The final version is available at


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