Analysis of the C P structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at √s = 13.6 TeV
Abstract
This paper presents a measurement of the charge-parity (C P) structure of the Yukawa coupling between the Higgs boson (H) and tau leptons, using proton-proton collision data at √s = 13.6 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 62.4 fb−1. Angular correlations between the decay products of tau leptons produced in H → ττ decays are exploited to constrain the effective C P mixing angle αHττ, which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be αHττ = (36 +33−30)∘, compared with an expected value of (0 ± 19)∘ under the standard model hypothesis. When combined with the previous CMS measurement using data collected at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb−1, the mixing angle is determined to be (7 ± 16)∘, with an expected value of (0 ± 14)∘. This result represents the most precise measurement by CMS of the C P nature of the Higgs boson coupling to tau leptons, with an expected precision that is the best achieved by any experiment to date.
Versions
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BibTeX
@misc{collaboration2026analysis,
title = {{Analysis of the $C\!P$ structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at $\sqrts$ = 13.6 TeV}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.03510},
eprint = {2606.03510},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.03510},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Analysis of the C P structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at √s = 13.6 TeV
AU - CMS Collaboration
PY - 2026
DA - 2026/10/15
PB - arXiv
DO - 10.48550/arxiv.2606.03510
UR - https://arxiv.org/abs/2606.03510
AB - This paper presents a measurement of the charge-parity (C P) structure of the Yukawa coupling between the Higgs boson (H) and tau leptons, using proton-proton collision data at √s = 13.6 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 62.4 fb^−1. Angular correlations between the decay products of tau leptons produced in H → ττ decays are exploited to constrain the effective C P mixing angle α^Hττ, which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be α^Hττ = (36 ^+33_−30)^∘, compared with an expected value of (0 ± 19)^∘ under the standard model hypothesis. When combined with the previous CMS measurement using data collected at √s = 13 TeV, corresponding to an integrated luminosity of 138 fb^−1, the mixing angle is determined to be (7 ± 16)^∘, with an expected value of (0 ± 14)^∘. This result represents the most precise measurement by CMS of the C P nature of the Higgs boson coupling to tau leptons, with an expected precision that is the best achieved by any experiment to date.
ER -