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

A bstract 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 $$ \sqrt{s}=13 $$ 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 $$ \overset{\sim }{d} $$ d ~ , and in the Warsaw basis by $$ {c}_{H\overset{\sim }{W}} $$ c H W ~ , $$ {c}_{H\overset{\sim }{B}} $$ c H B ~ , and $$ {c}_{H\overset{\sim }{W}B} $$ c H W ~ B . No deviations relative to the Standard Model are observed, and limits are obtained on the strength parameters. The $$ \overset{\sim }{d} $$ d ~ parameter is constrained to the interval [−0 . 012 , 0 . 044] at the 95% confidence level while $$ {c}_{H\overset{\sim }{W}} $$ c H 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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