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

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Název: Measurement of the CP properties of Higgs boson interactions with τ-leptons with the ATLAS detector.
Autoři: Aad, G., Abbott, B., Abbott, D. C., Abeling, K., Abidi, S. H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Hoffman, A. C. Abusleme, Acharya, B. S., Achkar, B., Bourdarios, C. Adam, Adamczyk, L., Adamek, L., Addepalli, S. V., Adelman, J., Adiguzel, A., Adorni, S., Adye, T.
Zdroj: European Physical Journal C -- Particles & Fields; Jul2023, Vol. 83 Issue 7, p1-30, 30p
Témata: CP violation, HIGGS bosons, LARGE Hadron Collider, YUKAWA interactions, STANDARD model (Nuclear physics), PROTON-proton interactions, DETECTORS
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
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Abstrakt: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. [ABSTRACT FROM AUTHOR]
ISSN:14346044
DOI:10.1140/epjc/s10052-023-11583-y