Thesis


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Academic Year
2012 / 2013
Title
Development of boosted jet triggers for Higgs searches at the ATLAS experiment at the LHC/CERN
Domain
Experimental Particle Physics
Abstract
The search for the Higgs boson is the main goal of the LHC experiments. Current fits to the experimental measurements of the Standard Model favor a low mass Higgs, close to the LEP exclusion limit (114GeV). In this mass regime, the dominant decay channel is H->bb. Recent studies have shown that in a boosted regime, where the W/Z and the Higgs have a very large pT, the backgrounds can be reduced and these channels may contribute for a low mass Higgs discovery. However, the current ATLAS jet trigger was not designed to select boosted jets with substructure, having therefore low efficiency. The feasible channels, usually require a high pT lepton for trigger. Some channels, like the pp->ZH->nu nu bb, can benefit clearly from the introduction of a dedicated trigger that selects efficiently boosted objects. Channels like pp->ZH->jet-jet bb, pp->WH->jet-jet bb, can only be possible with such a trigger.
Institution
grants the Degree
U. Lisboa
Host Institution
LIP-Lisboa
Supervisor
Patricia Conde Muino
Co-Supervisor
Agostinho Gomes