17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Measurements of the production properties of top quark pairs in pp collisions (includes charge asymmetry and spin correlations) with the CMS detector

19 Jul 2013, 18:20
F2 (KTH Campus)


KTH Campus

Talk presentation Top and Electroweak Physics Top and Electroweak Physics


Tyler Mc Millan Dorland (Deutsches Elektronen-Synchrotron (DE))


Measurements are presented of the properties of top quark pairs in production from proton-proton collisions at the LHC. The data were collected at pp centre-of-mass energies of 7 and 8 !TeV by the CMS experiment during the years 2011 and 2012. The charge asymmetry is measured both inclusively and differentially as function of the invariant mass, the rapidity and the transverse momentum of the ttbar system. The results are compared with various theory predictions, and discussed in the context of forward-backard asymmetry measurements at Tevatron. Top quark spin correlations are also measured using the angular distributions of the top quark decay products. The measurement is performed using top quark events in the lepton+jets channel, with one lepton (electron or muon) and at least four jets, and in the dilepton channel, with two leptons (muon or electron) and at least two jets in the final state. In the dilepton channel the difference in azimuthal angle between the two charged leptons is compared to the expected distributions in the Standard Model.

Primary author

Dr Kerstin Borras (Deutsches Elektronen-Synchrotron (DE))

Presentation Materials