Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 61: Experimentelle Methoden II

T 61.9: Talk

Wednesday, March 21, 2018, 18:30–18:45, Z6 - SR 1.013

Optimization of the photon identification in the ATLAS experiment — •Jan-Hendrik Arling — Deutsches Elektronen-Synchrotron DESY, ATLAS group, Hamburg — TU Dortmund, Lehrstuhl für Experimentelle Physik IV, Dortmund

A key ingredient for the physics program of the ATLAS experiment at the Large Hadron Collider is the efficient reconstruction and identification of photons in the high-energy pp collisions.
Photons play an important role in many measurements, such as the production of photons in Standard Model processes or Higgs boson decays into two photons (H→γγ), and searches for physics beyond the Standard Model. In each of these, it is important to identify photons with a high efficiency while keeping the number of misidentified photons at a low rate.
Photons are identified by defining independent requirements on variables describing the shape of electromagnetic showers inside the ATLAS calorimeter. This approach can be challenged by more sophisticated methods, such as machine learning algorithms, to improve the identification performance further. A newly developed framework helps to study these multivariate-analysis techniques and compare the performance between different tuning approaches.
This talk will show the current development stage of the optimization framework for the photon identification in the ATLAS experiment.