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T: Fachverband Teilchenphysik

T 65: Top quarks: differential cross sections

T 65.10: Vortrag

Mittwoch, 1. April 2020, 18:45–19:00, H-HS VIII

Measurement of the jet mass distribution in boosted top quark decays at CMS — Johannes Haller, Roman Kogler, •Alexander Paasch, and Dennis Schwarz — Institut für Experimentalphysik, Universität Hamburg

The top quark plays an essential role in particle physics and precision measurements of its mass allow consistency tests of the standard model. While most measurements of the top quark mass rely on the reconstruction of its decay products as distinct objects, this analysis targets the boosted regime where the decay products are reconstructed in a single large jet, using the exclusive cone (XCone) algorithm. The differential tt cross section is measured as a function of the jet mass for transverse momenta larger than 400 GeV. The distribution is sensitive to the value of the top quark mass, enabling a measurement in the boosted regime. Studies are presented for a measurement in the lepton+jets channel, using data recorded by the CMS experiment in 2016, 2017 and 2018 at a center of mass energy of 13 TeV.