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

G. Aad, B. Abbott, D.C. Abbott, K. Abeling, S.H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, A. C. Abusleme Hoffman, …
European Physical Journal C, 卷.83(7), 563
07/2023

摘要

Engineering (miscellaneous) Physics and Astronomy (miscellaneous)
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→ ττ 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.

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