DPG Phi
Verhandlungen
Verhandlungen
DPG

Würzburg 2018 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

T: Fachverband Teilchenphysik

T 34: Top-Quarks: Eigenschaften I

T 34.7: Talk

Tuesday, March 20, 2018, 18:00–18:15, Z6 - SR 1.002

Top-antitop energy asymmetry in jet-associated top-quark pair production at ATLAS — •Alexander Basan, Peter Berta, Sabrina Groh, Melanie Schepp, and Lucia Masetti — Intitute of Physics, Johannes Gutenberg University Mainz

The top quark is particularly well suited to probe the standard model and many extensions thereof at the electroweak symmetry-breaking scale and beyond. Specifically, the charge asymmetry in tt events can provide sensitive probes for many models beyond the standard model including massive color-octet states, extra dimensions, flavor violating gauge bosons and axigluons.

In inclusive jet-associated top-quark pair production the asymmetry arises already at leading order in quark-gluon interactions. Furthermore, the ttj final states allow the definition of a new observable, the energy asymmetry, expressed in terms of the distribution of the energy difference EtEt.

This talk presents the measurement of the tt energy asymmetry in the lepton+jets channel at ATLAS with a center of mass energy of √s=13 TeV. Additionally to top quarks produced close to threshold, boosted topologies are studied separately to estimate the improvement in sensitivity due to the different kinematic region and reduced combinatorial background.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2018 > Würzburg