Abstract
Hadronic signatures are critical to the ATLAS physics program, and are used extensively for both the StandardModel measurements and searches for new physics. These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). Additionally, missing transverse momentum from non-interacting particles provides an interesting probe in the search for new physics beyond the Standard Model. Developing trigger selections that target these events is a hugechallenge at the LHC due to the enormous rates associated with hadronic signatures. This challenge is exacerbated by the amount of pile-up activity, which continues to grow. In order to address these challenges, several new techniques were developed to significantly improve the potential of the 2017 dataset. An overview of how we triggeron hadronic signatures at the ATLAS experiment is presented, outlining the challenges of hadronic object triggering and describing the improvements performed over the course of the Run 2 LHC data-taking program. The performance in Run 2 data is shown, including demonstrations of the new techniques being used in 2017. We also discuss further critical developments implemented for the rest of Run 2 and their performance in early 2018 data.
Highlights
The ATLAS experiment [1] is a multi-purpose detector at the LHC
Its design was driven mainly by the potential to search for the Standard Model (SM) Higgs boson, before its mass was known, and to search for new particles Beyond the Standard Model (BSM), such as heavier gauge or Higgs bosons, dark matter candidates and supersymmetric particles
Since protons travel in compact bunches, there are usually many inelastic interactions per bunch crossing, the majority of which correspond to QCD-mediated di-jet production
Summary
The ATLAS experiment [1] is a multi-purpose detector at the LHC. Its design was driven mainly by the potential to search for the Standard Model (SM) Higgs boson, before its mass was known, and to search for new particles Beyond the Standard Model (BSM), such as heavier gauge or Higgs bosons, dark matter candidates and supersymmetric particles. The same is true for the missing transverse energy (ETmiss) computed from the hadronic component of the event. This is because the pT balance condition is not met exactly, due to limited resolution in the hadronic calorimeters. The main challenge for the jet and ETmiss trigger signatures is to reconstruct features as closely to the offline reconstruction as possible, using only the limited information available in the trigger. This should be achieved while ensuring rates do not increase faster than linearly as a function of pile-up
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