Typ

Artikel in einem Journal

Gebiet

ATLAS

Autor

G. Aad, …, C. Grefe, M. Hansen, P. Bechtle, K. Desch et al. (für die ATLAS-Kollaboration)

Titel

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

Datum

2023-07

Reportnummer

Eur. Phys. J. C 83, 563 (2023)

Kurzfassung

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 -lepton decays, where at least one hadronic decay is required. 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 ϕτ in the generalised Yukawa interaction. Without assuming the Standard Model hypothesis for the H→ττ signal strength, the mixing angle ϕτ 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.

Link

https://arxiv.org/abs/2212.05833

Journal

https://doi.org/10.1140/epjc/s10052-023-11583-y