# Measurement of the $t\bar{t}$ production cross section in the $\tau$ + jets final state in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector

## TL;DR

This paper reports a measurement of the top-antitop quark production cross section in proton-proton collisions at 8 TeV, focusing on events where the tau lepton decays hadronically, using data from the ATLAS detector.

## Contribution

It presents the first measurement of the $tar{t}$ cross section in the $ au$ + jets final state at 8 TeV using hadronic tau decays with a detailed counting experiment approach.

## Key findings

- Measured cross section: 239 ± 29 pb
- Results agree with other final state measurements
- Consistent with theoretical predictions

## Abstract

A measurement of the inclusive $pp\to t\bar{t}+X$ production cross section in the $\tau+{\rm jets}$ final state using only the hadronic decays of the $\tau$ lepton is presented. The measurement is performed using 20.2 fb$^{-1}$ of proton-proton collision data recorded at a center-of-mass energy of $\sqrt{s}=8$ TeV with the ATLAS detector at the Large Hadron Collider. The cross section is measured via a counting experiment by imposing a set of selection criteria on the identification and kinematic variables of the reconstructed particles and jets, and on event kinematic variables and characteristics. The production cross section is measured to be $\sigma_{t\bar{t}}= 239 \pm 29$ pb, which is in agreement with the measurements in other final states and the theoretical predictions at this center-of-mass energy.