SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 151: Exp. Methods IV
T 151.1: Vortrag
Donnerstag, 23. März 2023, 17:30–17:45, WIL/C129
Evaluating new triggers for ATLAS HH(4b) analysis in LHC Run 3 data — •Abdullah Nayaz1, Teng Jian Khoo2, and Cigdem Issever3 — 1Humboldt University, Berlin, Germany — 2Humboldt University, Berlin, Germany — 3Humboldt University, Berlin, Germany
The diHiggs (HH) study plays a central role in probing both the Standard Model and new Physics. The dominant higgs decay to a pair of b quarks (h->bb) makes the 4b final state one of the most significant signatures to look for a di-Higgs system.The small cross section of the process plus the existence of a huge QCD background make the trigger (selecting signature-relevant events) extremely challenging.
For Run 3, ATLAS has designed new triggers that use better reconstruction and selection, in order to improve the efficiency at which we record HH4b events. In this study, the efficiency of these triggers as well as the existing run-2 triggers are studied and compared using the hh4b MC samples and LHC run-3 data. Several factors such as improvement in jet calibration, b-tagging and optimized selection for hardware and software triggers are expected to boost the efficiency of over all run-3 triggers. The study, in particular, quantifies these improvements which is crucial for understanding the effectiveness of each trigger. In addition, since simulation is not a perfect reflection of real data, the measured detailed trigger performance in data and simulation will then help us to determine the parameterized correction factors needed to make simulation match the data.