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

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 805, 135426
Publication date2020
First online date2020-06-10
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=13TeV 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 on d˜ at 95% CL, while an expected 95% CL interval of d˜∈[−0.21,0.15] for the Standard Model hypothesis was expected.

Keywords
  • P p: scattering
  • P p: colliding beams
  • CP: violation
  • Invariance: CP
  • Higgs particle: hadroproduction
  • Vector boson: fusion
  • Higgs particle: leptonic decay
  • Tau: pair production
  • ATLAS
  • Electroweak interaction
  • Effective field theory
  • CERN LHC Coll
  • Gauge boson
  • Data analysis method
  • Experimental results
  • 13000 GeV-cms
  • S126CP
Citation (ISO format)
ATLAS Collaboration. Test of CP invariance in vector-boson fusion production of the Higgs boson in the H → ττ channel in proton–proton collisions at √s=13TeV with the ATLAS detector. In: Physics letters. B, 2020, vol. 805, p. 135426. doi: 10.1016/j.physletb.2020.135426
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Journal ISSN0370-2693
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