Abstract

Searches for dijet resonances with sub-TeV masses using the ATLAS detector at the Large Hadron Collider can be statistically limited by the bandwidth available to inclusive single-jet triggers, whose data-collection rates at low transverse momentum are much lower than the rate from standard model multijet production. This Letter describes a new search for dijet resonances where this limitation is overcome by recording only the event information calculated by the jet trigger algorithms, thereby allowing much higher event rates with reduced storage needs. The search targets low-mass dijet resonances in the range 450-1800GeV. The analyzed data set has an integrated luminosity of up to 29.3 fb^{-1} and was recorded at a center-of-mass energy of 13TeV. Noexcesses are found; limits are set on Gaussian-shaped contributions to the dijet mass distribution from new particles and on a model of dark-matter particles with axial-vector couplings to quarks.

Highlights

  • Background fit BumpHunter intervalZ’, σ x 500 mZ’ = GeV, g qData, 29.3 fb-1, |y*| < 0.6BumpHunter interval Z’, σ x 500χ2 p value = 0.13 0 −2 −2 m [GeV]500 600 700 800 9001000 mjj [GeV]

  • The Trigger-object Level Analysis (TLA) approach allows jet events to be recorded at a peak rate of up to twice the total rate of events using the standard approach, while using less than 1% of s=13 TeV, 29.3 fb-1

  • [10] ATLAS Collaboration, Search for new light resonances decaying to jet pairs and produced in assocpiaffiffition with a photon or a jet in proton-proton collisions at s 1⁄4 13 TeV

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Summary

Introduction

Alternative trigger strategies to search for low-mass resonances include selecting events with jets recoiling After the full calibration procedure, the energy of trigger-level jets is equivalent to that of offline jets to better than 0.05% for invariant masses of 400 GeV and their difference is negligible for invariant masses of 1 TeV. Energy scale and resolution uncertainties derived for offline jets [26] are applied to trigger-level jets in the signal simulation, with additional uncertainties equivalent to the size of the final trigger-to-offline correction (1%–3%).

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