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Luminosity measurements and heavy Higgs searches in decays of ZH and HH with the ATLAS detector
by
DrXiaohu Sun
→
Asia/Shanghai
A511 (IHEP)
A511
IHEP
Description
The Coherent Muon to Electron Transition (COMET) experiment is designed to search for muon to electron conversion, a process which has very good sensitivity to Beyond the Standard Model physics. The first phase of the experiment is currently under construction at J-PARC. This phase is designed to probe muon to electron conversion 100 times better than the current limit. The experiment will achieve this sensitivity by directing a high intensity muon beam at a stopping target. The detectors probe the resulting events for the signal 105 MeV electron from muon to electron conversion.
A boosted decision tree (BDT) algorithm has been developed to find this signal track. This BDT is used to combine energy deposition and timing information with a reweighted inverse hough transform to filter out background hits. The signal hits are then passed to the track fitting algorithm.
Results show that using a BDT significantly improves in background hit rejection when compared to traditional, cut-based hit rejection methods. At 99% signal hit retention, a cut on the energy deposition is able to remove 80% of background hits. By combining more multiple features, the BDT is able to remove 99% of background hits while still retaining 99% of signal hits.
