Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector.

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Zaǐtsev

doi:10.1140/epjc/s10052-016-4499-5

Abstract

A test of CP invariance in Higgs boson production via vector-boson fusion using the method of the Optimal Observable is presented. The analysis exploits the decay mode of the Higgs boson into a pair of tau leptons and is based on 20.3 mathrm{fb}^{-1} of proton–proton collision data at sqrt{s} = 8 ,mathrm{TeV} collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described in an effective field theory framework, in which the strength of CP violation is governed by a single parameter tilde{d}. The mean values and distributions of CP-odd observables agree with the expectation in the Standard Model and show no sign of CP violation. The CP-mixing parameter tilde{d} is constrained to the interval (-0.11,0.05) at 68% confidence level, consistent with the Standard Model expectation of tilde{d}=0.

Highlights

VBF H (~d=0)ATLAS τlepτhad s = 8 TeV, 20.3 fb-1 (b)BDTscore and b τlepτhad channel
The CP-mixing parameter dis constrained to the interval (−0.11, 0.05) at 68% confidence level, consistent with the Standard Model expectation of d = 0
The analysis presented here uses only the first-order Optimal Observable OO for the measurement of dvia a maximum-likelihood fit to the full distribution

Summary

Effective Lagrangian framework

As the different contributions from the various electroweak gauge-boson fusion processes cannot be distinguished experimentally with the current available dataset, the arbitrary choice d = dB is adopted. This yields the following relation for the gH V V :. The matrix element M for VBF production is the sum of a CP-even contribution MSM from the SM and a CPodd contribution MCP-odd from the dimension-six operators considered:. The second term d · 2Re(M∗SMMCP-odd), stemming from the interference of the two contributions to the matrix element, is CP-odd and is a possible new source of CP violation in the Higgs sector. The third term increases the total cross section by an amount quadratic in d, but this is not exploited in the analysis presented here

Test of CP invariance and Optimal Observable

The ATLAS detector

Simulated samples

Background

Analysis

Fitting procedure

Results

Conclusions

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Journal: Zeitschrift für Physik C: Particles and Fields	Publication Date: Nov 29, 2016
Citations: 47	License type: CC BY 4.0

R Discovery Prime

R Discovery Prime

Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector.

Abstract

Highlights

Summary

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