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T: Fachverband Teilchenphysik

T 62: Trigger 1

T 62.4: Vortrag

Mittwoch, 11. März 2015, 17:30–17:45, G.10.06 (HS 6)

Optimisation of the Level-1 Calorimeter trigger at ATLAS for Run II — •Stanislav Suchek for the ATLAS collaboration — Kirchhoff-Institute for Physics, Im Neuenheimer Feld 227, 69120 Heidelberg

The Level-1 Calorimeter Trigger (L1Calo) is a central part of the ATLAS Level-1 Trigger system, designed to identify jet, electron, photon, and hadronic tau candidates, and to measure their transverse energies, as well total transverse energy and missing transverse energy.

The optimisation of the jet energy resolution is an important part of the L1Calo upgrade for Run II. A Look-Up Table (LUT) is used to translate the electronic signal from each trigger tower to its transverse energy. By optimising the LUT calibration we can achieve better jet energy resolution and better performance of the jet transverse energy triggers, which are vital for many physics analyses. In addition, the improved energy calibration leads to significant improvements of the missing transverse energy resolution. A new Multi-Chip Module (MCM), as a part of the L1Calo upgrade, provides two separate LUTs for jets and electrons/photons/taus, allowing to optimise jet transverse energy and missing transverse energy separately from the electromagnetic objects. The optimisation is validated using jet transverse energy and missing transverse energy triggers turn-on curves and rates.