Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 74: Top physics 3 (single top)
T 74.4: Talk
Wednesday, March 6, 2024, 16:45–17:00, Geb. 30.95: Audimax
Search for the tWγ process with the CMS experiment — •Michele Mormile1, Ulrich Husemann1, Abideh Jafari1, and Michael Wassmer2 — 1Karlsruhe Institute of Technology — 2Deutsches Elektronen-Synchrotron (DESY)
We present an ongoing search for the production of a top quark in association with a W boson and a photon (tWγ). The analysis is based on proton-proton collision data at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC. tWγ is a rare process, with cross section in the order of 100 fb and it poses the experimental challenge of discriminating the signal from the large background of top quark pair production in association with a photon (ttγ). The analysis is performed in the double lepton channel, where both the top quark and the W boson decay leptonically. This talk will focus on the difficulties in reliably modeling the signal, due to the overlap of Feynman diagrams contributing to the production amplitudes of tWγ and ttγ, and on the Machine Learning algorithms used for the discrimination of the signal from the background.
Keywords: Top quark; Photon; W boson; Diagram removal; Machine Learning