Top quark properties at ATLAS

TL;DR

This paper discusses ATLAS's capabilities to measure top quark properties and search for new physics beyond the Standard Model, including decay modes, charge, spin, and resonance phenomena, with detailed sensitivity estimates.

Contribution

It provides a comprehensive assessment of ATLAS's potential to study top quark properties and explore beyond Standard Model physics using full detector simulation at 1fb-1 luminosity.

Findings

Expected precision for Standard Model top quark measurements

Sensitivity estimates for new physics searches

Discovery potential and exclusion limits for rare decays

Abstract

The ATLAS potential for the study of the top quark properties and physics beyond the Standard Model in the top quark sector, is described. The measurements of the top quark charge, the spin and spin correlations, the Standard Model decay (t-> bW), rare top quark decays associated to flavour changing neutral currents (t-> qX with X = gluon, Z, photon) and ttbar resonances are discussed. The sensitivity of the ATLAS experiment is estimated for an expected luminosity of 1fb-1 at the LHC. The full simulation of the ATLAS detector is used. For the Standard Model measurements the expected precision is presented. For the tests of physics beyond the Standard Model, the 5 sigma discovery potential (in the presence of a signal) and the 95% Confidence Level (CL) limit (in the absence of a signal) are given.