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Search for the nonresonant production of Higgs boson pairs via gluon fusion and vector-boson fusion in the $b\bar{b}τ^+τ^-$ final state in proton-proton collisions at $\sqrt{s}$ =1 3 TeV with the ATLAS detector
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Search for the nonresonant production of Higgs boson pairs via gluon fusion and vector-boson fusion in the $b\bar{b}τ^+τ^-$ final state in proton-proton collisions at $\sqrt{s}$ =1 3 TeV with the ATLAS detector

Georges Aad, Erlend Aakvaag, Braden Keim Abbott, Kira Abeling, Nils Julius Abicht, Haider Abidi, Mohammed Aboelela, Asmaa Aboulhorma, Halina Abramowicz, Henso Abreu, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2024
DOI: https://doi.org/10.3204/pubdb-2024-05961

摘要

background benchmark bottom: pair production bottom: particle identification CERN Lab CERN LHC Coll coupling constant: upper limit coupling: anomaly cross section: ratio: upper limit effective field theory experimental results GeV-cms gluon gluon: fusion gluon, fusion Higgs particle, coupling Higgs particle, pair production Higgs particle, production Higgs particle: decay modes Higgs particle: hadroproduction kinematics p p, scattering p p: colliding beams tau: pair production tau: particle identification TeV vector boson, fusion
A search for the nonresonant production of Higgs boson pairs in the HH → $b\bar{b}τ^+τ^-$ channel is performed using 140 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The analysis strategy is optimized to probe anomalous values of the Higgs boson self-coupling modifier $κ_λ$ and of the quartic HHVV (V=W,Z) coupling modifier $κ_{2V}$. No significant excess above the expected background from Standard Model processes is observed. An observed (expected) upper limit $μ_{HH}$<5.9(3.3) is set at 95% confidence-level on the Higgs boson pair production cross section normalized to its Standard Model prediction. The coupling modifiers are constrained to an observed (expected) 95% confidence interval of -3.1<$κ_λ$<9.0 (-2.5<$κ_λ$<9.3) and -0.5<$κ_{2V}$<2.7 (-0.2<$κ_{2V}$<2.4), assuming all other Higgs boson couplings are fixed to the Standard Model prediction. The results are also interpreted in the context of effective field theories via constraints on anomalous Higgs boson couplings and Higgs boson pair production cross sections assuming different kinematic benchmark scenarios.

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