Study of jet shapes in inclusive jet production inpp¯collisions ats=1.96TeV

We report on a study of jet shapes in inclusive jet production in $p\overline{p}$ collisions at $\sqrt{s}=1.96\mathrm{TeV}$ using the upgraded collider detector at Fermilab in Run II (CDF II) and based on an integrated luminosity of $170\mathrm{p}{\mathrm{b}}^{-1}$. Measurements are carried out on jets with rapidity $0.1<|Y^{\mathrm{jet}}|<0.7$ and transverse momentum $37\mathrm{GeV}/c<P_T^{\mathrm{jet}}<380\mathrm{GeV}/c$. 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.