Measurement of the CP properties of Higgs boson interactions with τ -leptons with the ATLAS detector

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, M.P. Heath, S. Palazzo, V.A. Parrish, E.A. Pender, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and τ -leptons is presented. The study is based on a measurement of CP-sensitive angular observables defined by the visible decay products of τ -leptons produced in Higgs boson decays. The analysis uses 139 fb−1 of proton–proton collision data recorded at a centre-of-mass energy of √s = 13 TeV with the ATLAS detector at the Large Hadron Collider. Contributions from CP-violating interactions between the Higgs boson and τ -leptons are described by a single mixing angle parameter φ τ in the generalised Yukawa interaction. Without constraining the H → τ τ signal strength to its expected value under the Standard Model hypothesis, the mixing angle φ τ is measured to be 9◦ ±16◦, with an expected value of 0◦ ± 28◦ at the 68% confidence level. The pure CP-odd hypothesis is disfavoured at a level of 3.4 standard deviations. The results are compatible with the predictions for the Higgs boson in the Standard Model.
Original languageEnglish
Article number563
Pages (from-to)1-30
Number of pages30
JournalThe European Physical Journal C
Issue number7
Publication statusPublished - 4 Jul 2023


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