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T: Fachverband Teilchenphysik

T 83: Search for new particles IV

T 83.1: Vortrag

Donnerstag, 2. April 2020, 16:30–16:45, L-2.017

Background estimate for a dijet resonance search with ATLAS at trigger level — •Falk Bartels — Kirchhoff-Institut für Physik, Heidelberg, Deutschland

Conventional LHC searches for dijet resonances are statistically limited in the sub-TeV range 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 jet information processed by the High Level Trigger for all events passing the seeding Level-1 Trigger. This allows lowering the minimum measured dijet mass from ≈1 TeV to 450 GeV.

The total of 77 billion dijet events recorded in this way during Run-2 require a novel approach for determining the QCD background. A sliding window fit with an analytic function as performed to 2016 data can be used but reduces the sensitivity to wider resonances. An alternative background estimate based on truth-level theory predictions is presented.