Study of Tau Leptons from Top Quark Pairs in ATLAS

TL;DR

This paper analyzes tau lepton production from top quark pairs in ATLAS data to search for signs of physics beyond the Standard Model, focusing on specific decay channels and setting limits on new particle properties.

Contribution

It presents in-progress analyses of tau+jets and tau+lepton channels in top decays, aiming to detect deviations from Standard Model predictions and constrain new physics parameters.

Findings

Preliminary exclusion limits on charged Higgs boson mass.

Constraints on the product of branching ratios for specific decay modes.

Analysis of tau lepton channels in top quark decays at 7 TeV.

Abstract

Top quark pair decay events resulting in final states containing {\tau} leptons present interesting channels in the search for physics beyond the Standard Model. This document describes the in-progress analyses of two channels, {\tau}+jets and {\tau}+l in tt^{-} decays, for the case of a hadronically decaying {\tau} lepton. The studied events are from 1.03 fb-1 of proton-proton collision data at \surds = 7 TeV recorded by the ATLAS Collaboration at the LHC. The goal of the analysis is to look for deviation from Standard Model expectations. Exclusion limits will be produced for the product of the branching ratios BR(t \rightarrow H+b) and BR(H+ \rightarrow {\tau}{\nu}) with respect to the charged Higgs boson mass, and also on the tan({\beta}) - MH+ plane in the mh-max scenario of the MSSM.