Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 105: Suche nach neuen Teilchen 6

T 105.5: Talk

Thursday, March 30, 2017, 17:45–18:00, JUR 5

Dedicated Energy Calibration of Trigger Jets for the Dijet Trigger Level Analysis with the ATLAS Detector — •Hanno Meyer zu Theenhausen — Universität Heidelberg

In the search for particles, which could mediate between the standard model sector and the dark matter sector, a large unexcluded parameter space is represented by small mediator masses, both from the cosmological as well as the particle physics point of view. In ATLAS and CMS at the Large Hadron Collider the sensitivity to mediators at small masses is limited by the data-archiving rate. As a result, their limits obtained from searches for low-mass resonances in the dijet mass spectrum are not competitive with those determined at the Tevatron and SPS. To circumvent this limitation, the dijet trigger level analysis (TLA) at ATLAS uses only the jet information from the trigger system, which can be recorded at higher event rates. The challenge of using trigger-based jet information is to achieve a similar performance of jet calibration as in the offline reconstruction, despite the lack of information e.g. from the tracking detectors. This talk reports on a dedicated derivation of a calorimeter based global sequential calibration scheme to be applied to the trigger-based jets, which improves jet energy resolution and reduces jet energy scale uncertainties.