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T: Fachverband Teilchenphysik

T 2: Search for new particles 1 (LHC)

T 2.4: Vortrag

Montag, 4. März 2024, 16:45–17:00, Geb. 20.30: 1.067

Searching for dijet resonances with the ATLAS trigger — •Falk Bartels — Kirchhoff-Institut für Physik, Heidelberg

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 allows for lowering the minimal detectable dijet resonance mass from above 1 TeV to around 400 GeV.

With more than 1 billion events in the recorded dijet mass spectrum, an exceptional statistical precision can be achieved. This level of precision is required for all steps of the analysis to achieve a high sensitivity for Physics beyond the Standard Model. The analysis is presented with special emphasis on the custom trigger-level jet calibration and the newly implemented fitting strategy to estimate the QCD background.

Keywords: ATLAS; trigger; dijet; resonance; search