Two-Particle Momentum Correlations in Jets Produced in ppbar Collisions at s**(1/2) = 1.96-TeV

TL;DR

This paper reports the first measurement of two-particle momentum correlations in jets from proton-antiproton collisions at 1.96 TeV, supporting the local parton-hadron duality hypothesis and estimating the parton shower cutoff scale.

Contribution

It provides the first experimental measurement of momentum correlations in jets at Tevatron energies and compares them with NLLA QCD predictions, estimating the parton shower cutoff scale.

Findings

Momentum correlations survive hadronization.

Results support local parton-hadron duality.

Estimated parton shower cutoff scale Q_eff.

Abstract

We present the first measurement of two-particle momentum correlations in jets produced in $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV. Results are obtained for charged particles within a restricted cone with an opening angle of 0.5 radians around the jet axis and for events with dijet masses between 66 and 563 GeV/c$^{2}$. A comparison of the experimental data to theoretical predictions obtained for partons within the framework of resummed perturbative QCD in the next-to-leading log approximation (NLLA) shows that the parton momentum correlations survive the hadronization stage of jet fragmentation, giving further support to the hypothesis of local parton-hadron duality. The extracted value of the NLLA parton shower cutoff scale $Q_\mathit{eff}$ set equal to $\Lambda_\mathit{QCD}$ is found to be $(1.4^{+0.9}_{-0.7})\times 100$ MeV.