Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 20: Higgs 1 (boson final states)

T 20.7: Vortrag

Montag, 4. März 2024, 17:30–17:45, Geb. 30.41: HS 2

Jet-Lepton Overlap Removal Optimization in context of the boosted H → WW → l ν qq measurement using Run 2 data in ATLAS — •Jan Philipp Jäkel, Chris Malena Delitzsch, and Carsten Daniel Burgard — Technische Universität Dortmund, Dortmund, Germany

The unprecedented center-of-mass energy of the Large Hadron Collider enables the production of Higgs bosons with a momentum much higher than their mass, resulting in a collimation of its decay products. In this presentation, the H → WW → l ν qq decay is explored due to its high branching ratio and the clean event signature. The hadronic decay of the W boson is reconstructed as one large-radius jet using particle flow-like objets as inputs, a combination of signals from the calorimeters and charged-particle tracks from the inner detector. In case of high collimation, the leptons from one of the W boson decays can overlap with the jet from the other W boson decay. In ATLAS, the reconstruction of leptons and jets is conducted independently from another and therefore the deposited energy of a charged lepton in the electromagnetic or hadronic calorimeter can be also reconstructed as part of the jet leading to double counting of the lepton’s energy in the event. The usage of particle flow-like objects for jet reconstruction enables the removal of the lepton’s energy at the calorimeter cell level to avoid the double counting. Modifications to the currently used particle flow algorithm are explored to optimise the overlap removal between jets and leptons with focus on electrons. The studies use Monte Carlo simulated events of √s = 13 TeV proton-proton collisions.

Keywords: Particle Flow; Jet reconstruction; Overlap removal