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T: Fachverband Teilchenphysik

T 65: Experimental methods III

T 65.3: Vortrag

Mittwoch, 17. März 2021, 16:30–16:45, To

Data-driven corrections to shower shape variables for photon identification with the ATLAS detector — •Jan Lukas Späh, Björn Wendland, and Johannes Erdmann — TU Dortmund, Experimentelle Physik IV

Measurements of Standard Model processes, searches for new particles or processes forbidden in the Standard Model with photons in the final state play an important role in the physics programme of the ATLAS experiment. At hadron colliders, studies of photons are particularly challenging as large background contributions arise from jets, which can be misidentified as photons. This requires a method of identification providing high efficiency for genuine photons while ensuring an excellent background rejection for misreconstructed objects. By now, this method relies on rectangular cuts on so-called shower shape variables, which capture relevant information about the shape and evolution of the electromagnetic shower and the possible leakage into the hadronic calorimeter.

Monte Carlo samples with accurate simulations of the electromagnetic showers are required to interpret measurements with photons consistently. However, residual mismodelling, especially in the distributions of the shower shape variables, is observed. Therefore, these simulated distributions are corrected with a data-driven approach.

In this talk, studies of one-dimensional correction methods with the full Run-2 dataset are discussed and new approaches to improve these methods are presented.