Test of CP invariance in vector-boson fusion production of the Higgs boson in the H → ττ channel in proton–proton collisions at √s=13 TeV with the ATLAS detector

Collaboration, ATLAS and Barton, A.E. and Bertram, I.A. and Borissov, G. and Bouhova-Thacker, E.V. and Fox, H. and Henderson, R.C.W. and Jones, R.W.L. and Kartvelishvili, V. and Long, R.E. and Love, P.A. and Muenstermann, D. and Parker, A.J. and Smizanska, M. and Tee, A.S. and Walder, J. and Wharton, A.M. and Whitmore, B.W. and Sanderswood, Izaac and Yexley, Melissa (2020) Test of CP invariance in vector-boson fusion production of the Higgs boson in the H → ττ channel in proton–proton collisions at √s=13 TeV with the ATLAS detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 805.

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Abstract

A test of CP invariance in Higgs boson production via vector-boson fusion is performed in the H → ττ decay channel. This test uses the Optimal Observable method and is carried out using 36.1fb-1 of √s=13 TeV proton–proton collision data collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described by an effective field theory, in which the parameter d˜  governs the strength of CP violation. No sign of CP violation is observed in the distributions of the Optimal Observable, and d˜  is constrained to the interval [−0.090, 0.035] at the 68% confidence level (CL), compared to an expected interval of d˜ ∈ [-0.035,0.033] based upon the Standard Model prediction. No constraints can be set d˜ on at 95% CL, while an expected 95% CL interval of d˜ ∈ [-0.21,0.15] for the Standard Model hypothesis was expected.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ID Code:
144102
Deposited By:
Deposited On:
18 May 2020 12:55
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 06:08