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Probing the Higgs boson CP properties in vector-boson fusion production in the H → [tau]+[tau]− channel with the ATLAS detector

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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 Collide...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Baltes, Lisa Marie (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Nandi, Abhirikshma (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 10 October 2025
In: Journal of high energy physics
Year: 2025, Issue: 10, Pages: 1-54
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)092
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP10(2025)092
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Author Notes:The ATLAS collaboration*
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Summary: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 $$ \overset{\sim }{d} $$, and in the Warsaw basis by $$ {c}_{H\overset{\sim }{W}} $$, $$ {c}_{H\overset{\sim }{B}} $$, and $$ {c}_{H\overset{\sim }{W}B} $$. No deviations relative to the Standard Model are observed, and limits are obtained on the strength parameters. The $$ \overset{\sim }{d} $$parameter is constrained to the interval [−0.012, 0.044] at the 95% confidence level while $$ {c}_{H\overset{\sim }{W}} $$is constrained to [−0.24, 0.83], when considering both linear and quadratic effects of physics beyond the Standard Model.
Item Description:Veröffentlicht: 10. Oktober 2025
*The ATLAS collaboration: G. Aad, A. Ackermann, M.J. Backes, L.M. Baltes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, A. Nandi, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, R. Stamen, L. Vigani, M. Wessels, J. Zinsser [und sehr viele weitere Personen]
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Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)092

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