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.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2025). Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2025(1) [10.1007/jhep01(2025)099].

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

Di Micco, B.
Membro del Collaboration Group
;
Di Nardo, R.
Membro del Collaboration Group
;
Montereali, F.
Membro del Collaboration Group
;
Orestano, D.
Membro del Collaboration Group
;
2025-01-01

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.
2025
Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2025). Search for boosted low-mass resonances decaying into hadrons produced in association with a photon in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2025(1) [10.1007/jhep01(2025)099].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/510400
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