Search for $W'\rightarrow t\bar{b}$ in the lepton plus jets final states with the ATLAS detector at the LHC

TL;DR

This paper reports a search for a hypothetical $W'$ boson decaying into a top and bottom quark pair using ATLAS data, setting limits on its production cross-section and couplings for masses between 0.5 and 3.0 TeV.

Contribution

It introduces a multivariate boosted decision tree method to search for $W'$ bosons in lepton plus jets final states at the LHC, providing new exclusion limits.

Findings

Excluded $W'$ masses between 0.5 and 3.0 TeV at 95% confidence level.

Set limits on $W'$ production cross-section and effective couplings.

Demonstrated the effectiveness of multivariate analysis in high-energy physics searches.

Abstract

This document presents a search for a $W'$ boson, decaying to a top quark and a $b$ quark in an effective coupling approach, using a multivariate method based on boosted decision trees. It reports exclusion limits on the $W'\rightarrow tb$ cross-section times branching ratio and effective couplings as a function of the $W'$-boson mass. The search covers $W'$-boson masses between 0.5 and 3.0 TeV, for right-handed or left-handed $W'$-boson, with 20.3 fb$^{-1}$ of proton-proton collision data produced by the LHC in 2012, at a center-of-mass energy of 8 TeV and collected by the ATLAS detector.