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T: Fachverband Teilchenphysik

T 41: Electroweak physics II

T 41.2: Vortrag

Dienstag, 31. März 2020, 17:15–17:30, L-3.016

Estimation of non-prompt lepton background in same-sign WW production at 13 TeV with ATLAS detector. — •Shalu Solomon for the ATLAS collaboration — Albet-Ludwigs University of Freiberg, Freiburg, Germany.

The production of same-sign W boson pair via vector boson scattering is one of the pivotal processes to experimentally probe the electroweak symmetry breaking mechanism. The analysis of 2015-2016 ATLAS data at 13 TeV resulted in the observation of the process with the signal significance of 6.5 sigma. With the entire Run 2 data set the signal event yield has increased approximately by a factor of 4, which gives the potential for the first differential cross-section measurement of this process. The final state consisting of two prompt leptons of the same electric charge, two neutrinos and two forward jets is considered. The second-largest background source, non-prompt lepton background, arises due to leptons from heavy-flavour hadron decays and jets misidentified as electrons, passing the lepton selection criteria. A data-driven technique, called fake factor method, is used to estimate this background. The fake factors are extracted from a jet-enriched sample kinematically close to the signal region. The performance of this background in various validation regions and the estimation in the signal region are presented.