Top-Antitop cross section measurement in the di-lepton decay channel with ATLAS

TL;DR

This paper reports on the simulation-based measurement of the top-antitop production cross section in the di-leptonic decay channel using ATLAS detector data, focusing on validation and systematic uncertainties.

Contribution

It introduces a simulation framework for top-antitop cross section measurement with ATLAS, employing multiple analysis methods and systematic studies before actual data collection.

Findings

Estimated statistical and systematic errors for 100 pb^{-1} luminosity.

Validation of detector simulation using CSC Monte Carlo data.

Comparison of cut-and-count and likelihood methods for cross section measurement.

Abstract

We present simulations of the production cross-section measurement of top-antitop pairs in the di-leptonic decay channel with the ATLAS detector. This study uses the Commissioning Service Challenge (CSC) data, which is the latest and centrally produced Monte-Carlo data set to validate the detector simulation before the actual data taking. The signal process was generated with MC@NLO and important background processes were studied. A cut and count method and two likelihood methods were employed to measure the cross section and important systematic effects were investigated. The expected statistical and systematic errors for a luminosity of 100 $\ipb$ are also given.