Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 101: Top Quark V (Wirkungsquerschnitte)

T 101.7: Vortrag

Donnerstag, 3. März 2016, 18:15–18:30, VMP9 HS

Measurement of the differential tt production cross section as a function of the jet mass in fully merged top quark decays in CMS — •Torben Dreyer, Johannes Haller, and Roman Kogler — Institut für Experimentalphysik, Universität Hamburg

The decay products of hadronically decaying top quarks are collimated into a single jet, if the top quarks are produced with high transverse momenta. In this case it is possible to reconstruct large jets containing a full hadronic top quark decay. The invariant mass of such jets is sensitive to the mass of the top quark itself and is calculable theoretically. A comparison to theory calculations could lead to an extraction of the top quark mass in a well defined renormalization scheme.

In this contribution a measurement of the differential tt production cross section as a function of the jet mass is presented. The measurement is performed in the lepton+jets decay channel with data collected by the CMS detector in proton-proton collisions at a center of mass energy of 8 TeV. Events are selected with transverse jet momenta greater than 400 GeV to select fully merged top quark decays. To allow a comparison to theory calculations the data is corrected for detector effects using a regularized unfolding method.