Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Top-Physik III

T 83.7: Talk

Thursday, March 28, 2019, 17:30–17:45, S10

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

The top quark plays a special role in modern particle physics since it is not only heavily involved in searches for new physics but also offers consistency tests of the standard model, especially by measuring its mass with high precision.

While typical top quark mass measurements at hadron colliders rely on the reconstruction of the decay products as separate objects, this analysis is carried out in the boosted regime where the top quark decay can be reconstructed within one single hadronic jet. Using the XCone jet clustering algorithm, the differential cross section as a function of the jet mass can be measured in pp collisions at the LHC. Furthermore, the cross section can be calculated analytically, offering the possibility to extract a well defined top quark mass without relying on the mass parameter in Monte Carlo simulations.

The measurement is performed in the lepton+jets channel of tt using data recorded by the CMS detector in 2016 at a center of mass energy of 13 TeV.