Supersymmetry models in which the lightest particle is pure-wino or pure-higgsino have chargino next-to-lightest-particles (NLSP) nearly mass-degenerate with the lightest neutralino, resulting in a lifetime long enough to produce hits in the Pixel Detector but not long enough to produce a full track; this is called the "disappearing track signature". Electrons and muons which traverse the Pixel Detector and Coulomb scatter at a steep angle and therefore fail to be reconstructed as electrons or muons are a significant background to this signature; this is the "lepton scatter background". This lepton scatter background was characterized using 36 fb−1 of integrated luminosity of proton-proton collisions at √s = 13 TeV center-of-mass energy in the ATLAS Detector. Electrons were found to dominate at lower transverse momentum whereas at above about 100 GeV the contributions are similar. Comparison with a representative pure-wino Monte Carlo model suggests a minimum threshold of pT > 100 GeV should be used in the full analysis.
|Commitee:||Nielsen, Jason, Hance, Michael|
|School:||University of California, Santa Cruz|
|School Location:||United States -- California|
|Source:||DAI-B 81/7(E), Dissertation Abstracts International|
|Subjects:||Particle physics, Physics|
|Keywords:||Background estimation, Chargino, Disappearing track, Lepton scatter|
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