Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in 132 fb − 1 of p p collisions at s = 13 TeV

Fernandez Barbadillo, Beltran (2025) Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in 132 fb − 1 of p p collisions at s = 13 TeV. Physical Review D, 112 (9): 092015. ISSN 2470-0010

Abstract

This article reports on a search for dijet resonances using 132 fb − 1 of p p collision data recorded at s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The search is performed solely on jets reconstructed within the ATLAS trigger to overcome bandwidth limitations imposed on conventional single-jet triggers, which would otherwise reject data from decays of sub-TeV dijet resonances. Collision events with two jets satisfying transverse momentum thresholds of p T ≥ 85 GeV and jet rapidity separation of | y * | < 0.6 are analysed for dijet resonances with invariant masses from 375 to 1800 GeV . A data-driven background estimate is used to model the dijet mass distribution from multijet processes. No significant excess above the expected background is observed. Upper limits are set at 95% confidence level on coupling values for a benchmark leptophobic axial-vector Z ′ model and on the production cross section for a new resonance contributing a Gaussian-distributed line-shape to the dijet mass distribution.