Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 65: Experimentelle Methoden II
T 65.3: Vortrag
Mittwoch, 27. März 2019, 16:30–16:45, S01
Particle Flow jets in the H→ ZZ* → 4ℓ analysis at ATLAS for optimizing kinematical reconstructio — •Tobias Klingl, Philip Bechtle, and Klaus Desch — Universität Bonn
In the LHC Run-II, the Higgs simplified template cross sections (STXS) framework was developed to provide signal strength measurements in kinematical distributions of Higgs Boson production and decay. About 2.5 % of Higgs Bosons with a mass of mH = 125 GeV produced at the LHC decay into a real and virtual Z boson. The further decay into two lepton pairs provides a clear final state with high reconstruction efficiency and good access to the underlying Higgs Boson kinematics. On top of the four final state leptons an event can contain additional jets. New physics at high energy scales might influence the properties of the extra jets, therefore their precise reconstruction is of high importance. These jets were typically reconstructed using topological cell clustering. In this study we aim to optimize the STXS bins by switching to particle flow jets which have demonstrated superior momentum and spatial resolutions, especially at low energies.