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Probing the Higgs boson CP properties in vector-boson fusion production in the $Hightarrowτ^+τ^-$ channel with the ATLAS detector
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Probing the Higgs boson CP properties in vector-boson fusion production in the $Hightarrowτ^+τ^-$ channel with the ATLAS detector

Georges Aad, Erlend Aakvaag, Braden Keim Abbott, Sara Abdelhameed, Kira Abeling, Nils Julius Abicht, Haider Abidi, Mohammed Aboelela, Asmaa Aboulhorma, Halina Abramowicz, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2025
DOI: https://doi.org/10.3204/pubdb-2025-02604

摘要

The CP properties of the Higgs boson are studied in the vector-boson fusion production mode. The analysis exploits the decay mode of the Higgs boson into two $τ$-leptons using 140 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV collected by the ATLAS experiment at the Large Hadron Collider. Results are obtained using the Optimal Observable method. CP-violating interactions between the Higgs boson and electroweak gauge bosons are considered in the effective field theory framework, with the interaction strength described in the HISZ basis by $\tilde{d}$, and in the Warsaw basis by $c_{H\tilde{W}}$, $c_{H\tilde{B}}$, and $c_{H\tilde{W}B}$. No deviations relative to the Standard Model are observed, and limits are obtained on the strength parameters. The $\tilde{d}$ parameter is constrained to the interval [$-0.012, 0.044$] at the 95% confidence level while $c_{H\tilde{W}}$ is constrained to [$-0.24, 0.83$], when considering both linear and quadratic effects of physics beyond the Standard Model.

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