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Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad final state using pp collisions at √s=13 TeV with the ATLAS detector
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Search for Higgs boson decays into a pair of pseudoscalar particles in the γγτhadτhad final state using pp collisions at √s=13 TeV with the ATLAS detector

Georges Aad, Kingman Cheung, Erlend Aakvaag, Yuan-Tang Chou, Braden Keim Abbott, Pai-Hsien Hsu, Sara Abdelhameed, Shih-Chang Lee, Kira Abeling, Nils Julius Abicht, …
Deutsches Elektronen-Synchrotron, DESY, Hamburg
2024

摘要

A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H→aa, where one decays into a photon pair and the other into a τ-lepton pair, is presented. Both τ-leptons are reconstructed in the hadronic decay modes using a dedicated tagger for collimated τ-lepton pairs. The search uses 140 fb−1 of proton-proton collision data at a centre-of-mass energy of s√=13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No significant excess of events is observed above the Standard Model background expectation. Upper limits at 95% confidence level are set on the branching ratio of the Higgs boson to the γγττ final state, B(H→aa→γγττ), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.

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https://bib-pubdb1.desy.de/record/620124檢視

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