Studies of high-transverse momentum jet substructure and top quarks produced in 1.96 TeV proton-antiproton collisions

TL;DR

This paper analyzes the substructure of high-pT jets and searches for boosted top quarks in proton-antiproton collisions, providing measurements and limits that test quantum chromodynamics predictions and top quark production models.

Contribution

It presents the first detailed study of jet substructure at high transverse momentum in proton-antiproton collisions and sets an upper limit on boosted top-quark production cross section.

Findings

Jet mass, angularity, and planar-flow distributions measured and compared with QCD predictions.

No significant excess observed; upper limit set on boosted top-quark production cross section.

Results support current QCD models and constrain new physics scenarios.

Abstract

Results of a study of the substructure of the highest transverse momentum (pT) jets observed by the CDF collaboration are presented. Events containing at least one jet with pT > 400 GeV/c in a sample corresponding to an integrated luminosity of 5.95 inverse fb, collected in 1.96 TeV proton-antiproton collisions at the Fermilab Tevatron collider, are selected. A study of the jet mass, angularity, and planar-flow distributions is presented, and the measurements are compared with predictions of perturbative quantum chromodynamics. A search for boosted top-quark production is also described, leading to a 95% confidence level upper limit of 38 fb on the production cross section of top quarks with pT > 400 GeV/c.