Charged jet cross section and fragmentation in proton-proton collisions at $\sqrt{s}$ = 7 TeV

Abstract

We report the differential charged jet cross section and jet fragmentation distributions measured with the ALICE detector in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=$ 7 TeV. Jets with pseudo-rapidity $\left|\eta \right|<0.5$ are reconstructed from charged particles using the anti-$k_{\mathrm{T}}$ jet finding algorithm with a resolution parameter $R$ = 0.4. The jet cross section is measured in the transverse momentum interval 5 $\le p_{\mathrm{T}}^{\mathrm{ch}\mathrm{jet}}<$ 100 GeV/$c$. Jet fragmentation is studied measuring the scaled transverse momentum spectra of the charged constituents of jets in four intervals of jet transverse momentum between 5 GeV/$c$ and 30 GeV/$c$. The measurements are compared to calculations from the PYTHIA model as well as next-to-leading order perturbative QCD calculations with POWHEG + PYTHIA8. The charged jet cross section is described by POWHEG for the entire measured range of $p_{\mathrm{T}}^{\mathrm{ch}\mathrm{jet}}$. For $p_{\mathrm{T}}^{\mathrm{ch}\mathrm{jet}}$ $>$ 40 GeV/$c$, the PYTHIA calculations also agree with the measured charged jet cross section. PYTHIA6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for PYTHIA8.

This publication is dedicated to the memory of our colleague Oliver Busch. 23 pages, 3 captioned figures, 1 table, authors from page 18, submitted to PRD, figures at http://alice-publications.web.cern.ch/node/4553

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