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Search for dark mesons decaying to top and bottom quarks in proton-proton collisions at $ \sqrt{\textrm{s}} $ = 13 TeV with the ATLAS detector
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Search for dark mesons decaying to top and bottom quarks in proton-proton collisions at $ \sqrt{\textrm{s}} $ = 13 TeV 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
2024
DOI: https://doi.org/10.3204/pubdb-2024-06109

摘要

background Beyond Standard Model CERN LHC Coll conservation law Dark Matter dimension: 2 electron Exotics experimental results final state: ((n)jet lepton) final state: ((n)jet) final state: hadronic GeV-cms Hadron-Hadron Scattering hidden sector mass: lower limit muon p p: colliding beams p p: scattering pi: mass rho: mass symmetry: flavor
A search for dark mesons originating from strongly-coupled, SU(2) dark flavor symmetry conserving models and decaying gaugephobically to pure Standard Model final states containing top and bottom quarks is presented. The search targets fully hadronic final states and final states with exactly one electron or muon and multiple jets. The analyzed data sample corresponds to an integrated luminosity of 140 fb$^{−1}$ of proton-proton collisions collected at $ \sqrt{s} $ = 13 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess over the Standard Model background expectation is observed and the results are used to set the first direct constraints on this type of model. The two-dimensional signal space of dark pion masses $ {m}_{\pi_D} $ and dark rho-meson masses $ {m}_{\rho_D} $ is scanned. For $ {m}_{\pi_D}/{m}_{\rho_D} $ = 0.45, dark pions with masses $ {m}_{\pi_D} $< 940 GeV are excluded at the 95% CL, while for $ {m}_{\pi_D}/{m}_{\rho_D} $ = 0.25 masses $ {m}_{\pi_D} $< 740 GeV are excluded.[graphic not available: see fulltext]

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