Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 101: Top Quark 5 (Eigenschaften)

T 101.3: Talk

Thursday, March 30, 2017, 17:15–17:30, JUR 4

Measurement of the Top Quark Mass in the Muon+Jets Final State at √s =13 TeV in 2015 data — •Christoph Garbers, Nataliia Kovalchuk, Johannes Lange, Peter Schleper, Hartmut Stadie, Fred Stober, Markus Seidel und Andre Schmalfeld — Universität Hamburg, Hamburg, Germany

The top quark is the heaviest known particle in the standard model. The precise measurement of its properties is mandatory for a more accurate knowledge of the standard model of particle physics and a important indicator for new physics searches. We present a measurement of the top quark mass using a sample of tt candidate events with a muon and at least four jets in the final state, collected by CMS in pp collisions at √s=13 TeV at the LHC in 2015. The candidate events are selected from data corresponding to an integrated luminosity of 2.2 fb⁻¹. For each event the mass of the top quark candidates is reconstructed from a kinematic fit of the decay products to a tt hypothesis. The top quark mass is determined with a template method. Simultaneously a jet energy scale factor (JSF) is estimated from the invariant mass of the W boson candidate. The combination of the insitu JSF with jet energy corrections out of γ/W events reduces systematic uncertainties.