A model-independent search for low-mass resonances decaying into pairs of oppositely charged muons is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb-1, recorded by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. The search targets hypothetical dimuon resonances in the invariant mass range from 35 GeV to 75 GeV. The modelling of this mass region is particularly challenging for conventional analytic background parameterisations. To address this, a Gaussian process regression technique is used to model the background. The dimuon mass spectrum is analysed for potential signals, and no statistically significant excess is observed. Upper limits at the 95% confidence level are set on the fiducial production cross-section of new resonances decaying promptly into muons, ranging from 20 fb to 110 fb, depending on the resonance mass. These results are further interpreted in the context of dark-photon and dark-matter-mediator models, leading to new constraints on their parameter spaces.

Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb-1 of 13 TeV pp collisions with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(6) [10.1007/jhep06(2026)165].

Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb-1 of 13 TeV pp collisions with the ATLAS detector

Aielli, G.;Camarri, P.;Cerrito, L.;De Sanctis, U.;Di Ciaccio, A.;
2026-01-01

Abstract

A model-independent search for low-mass resonances decaying into pairs of oppositely charged muons is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb-1, recorded by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. The search targets hypothetical dimuon resonances in the invariant mass range from 35 GeV to 75 GeV. The modelling of this mass region is particularly challenging for conventional analytic background parameterisations. To address this, a Gaussian process regression technique is used to model the background. The dimuon mass spectrum is analysed for potential signals, and no statistically significant excess is observed. Upper limits at the 95% confidence level are set on the fiducial production cross-section of new resonances decaying promptly into muons, ranging from 20 fb to 110 fb, depending on the resonance mass. These results are further interpreted in the context of dark-photon and dark-matter-mediator models, leading to new constraints on their parameter spaces.
2026
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
Hadron-Hadron Scattering
Null, N., Aad, G., Aakvaag, E., Abbott, B., Abdelhameed, S., Abeling, K., et al. (2026). Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb-1 of 13 TeV pp collisions with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2026(6) [10.1007/jhep06(2026)165].
Null, N; Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, Nj; Abidi, Sh; Aboelela, M; Aboulhorma, A; Abramowicz, H; Acharya, Bs; Ack...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/468948
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