Study of Jet Shapes in Inclusive Jet Production in ppbar Collisions at sqrt{s} = 1.96 TeV

TL;DR

This study measures jet shapes in proton-antiproton collisions at 1.96 TeV, comparing results to QCD-based Monte Carlo models, and finds that a tuned PYTHIA model best describes the observed data.

Contribution

It provides detailed measurements of jet shapes at Tevatron energies and evaluates the performance of different Monte Carlo models against these measurements.

Findings

PYTHIA with underlying event tuning matches data well

Default PYTHIA and HERWIG models are less accurate

Jet shapes are well described after correction to hadron level

Abstract

We report on a study of jet shapes in inclusive jet production in $p \bar{p}$ collisions at $\sqrt{s} = 1.96 {\rm TeV}$ using the upgraded Collider Detector at Fermilab in Run II (CDF II) based on an integrated luminosity of $170 \rm pb^{-1}$. Measurements are carried out on jets with rapidity $0.1 < |Y^{\rm jet}| < 0.7$ and transverse momentum 37 GeV/c $< P_T^{\rm jet} < 380$ GeV/c. The jets have been corrected to the hadron level. The measured jet shapes are compared to leading-order QCD parton-shower Monte Carlo predictions as implemented in the PYTHIA and HERWIG programs. PYTHIA, tuned to describe the underlying event as measured in CDF Run I, provides a better description of the measured jet shapes than does PYTHIA or HERWIG with their default parameters.