Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 37: Search for New Particles II

T 37.9: Talk

Tuesday, March 16, 2021, 18:00–18:15, Tl

Lowering the dijet resonance mass threshold for a trigger-level analysis in ATLAS — Falk Bartels and •Hagen Tockhorn — Kirchhoff-Institut für Physik, Heidelberg, Deutschland

The search for sub-TeV dijet resonances at the LHC is statistically limited due to the reduced readout rate of lower p_T jet triggers. The ATLAS trigger-level analysis covers this part of the spectrum by recording a strongly reduced set of event-level information processed by the High Level Trigger for all events passing the seeding Level-1 trigger. This has so far allowed for lowering the minimal detectable dijet resonance mass from ≈1 TeV to 450 GeV.

To further lower this threshold, a novel approach for defining the signal region is presented. Selecting the efficient phase space of the jet trigger based on the dijet mass instead of the leading jet p_T can yield significantly lower mass thresholds. Additionally, the potential of including even lower p_T Level-1 triggers is investigated.