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Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at √s=13 TeV with the ATLAS detector
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Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at √s=13 TeV with the ATLAS detector

ATLAS Collaboration, Diksha Garg and Usha Mallik
ArXiv.org
Cornell University
07/31/2024
DOI: 10.48550/arXiv.2408.00049
url
https://doi.org/10.48550/arXiv.2408.00049View
Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

Many extensions of the Standard Model, including those with dark matter particles, propose new mediator particles that decay into hadrons. This paper presents a search for such low mass narrow resonances decaying into hadrons using 140 fb$^{-1}$ of proton-proton collision data recorded with the ATLAS detector at a centre-of-mass energy of 13 TeV. The resonances are searched for in the invariant mass spectrum of large-radius jets with two-pronged substructure that are recoiling against an energetic photon from initial state radiation, which is used as a trigger to circumvent limitations on the maximum data recording rate. This technique enables the search for boosted hadronically decaying resonances in the mass range 20-100 GeV hitherto unprobed by the ATLAS Collaboration. The observed data are found to agree with Standard Model predictions and 95% confidence level upper limits are set on the coupling of a hypothetical new spin-1 $Z'$ resonance with Standard Model quarks as a function of the assumed $Z'$-boson mass in the range between 20 and 200 GeV.
 Mediation dark matter GeV hadron initial state mass spectrum narrow resonance, mass p p, scattering photon quark radiation, initial-state interaction structure TeV trigger

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