Freiburg 2008 – scientific programme

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T: Fachverband Teilchenphysik

T 32: Top-Physik I

T 32.9: Talk

Monday, March 3, 2008, 18:50–19:05, KGI-HS 1098

Top quark production background studies using the ATLAS detector at the LHC — •Balint Radics — Universität Bonn

Precision measurements of top quark pair production cross section are an important test of the Standard Model and are necessary for any study of effects beyond the Standard Model. At the ATLAS detector of the Large Hadron Collider clean signals from physics processes with high branching ratios, significant missing transverse energy and isolated high transverse momentum leptons are expected to be triggered with high efficiency. Having such clean data samples accurate determination of the cross section in the t+t → bℓ ν_ℓbjj semileptonic channel will be limited by the level of understanding of the shape as well as the ratio of signal to combinatorial background events, the later of which can be the result of misreconstructed (anti)top quarks and also the existence of possible additional extra partons in the final state. A study on the shape of the combinatorial background in different Alpgen and Mc@NLO samples for the process gg→ t + t + N partons is performed.