Charged jet cross section and fragmentation in proton-proton collisions at √s = 7 TeV

ALICE Collaboration, S. Acharya, H. A. Andrews, D. Evans, K. L. Graham, O. Jevons, P. G. Jones, A. Jusko, M. Krivda, J. Kvapil, R. Lietava, O. Villalobos Baillie, E. Willsher, N. Zardoshti

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8 Citations (Scopus)
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Abstract

We report the differential charged jet cross section and jet fragmentation distributions measured with the ALICE detector in proton-proton collisions at a center-of-mass energy √s=7 TeV. Jets with pseudorapidity |η|<0.5 are reconstructed from charged particles using the anti-kT jet-finding algorithm with a resolution parameter R=0.4. The jet cross section is measured in the transverse momentum interval 5≤pTch 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 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 well described by powheg for the entire measured range of pTch jet. For pTch 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.

Original languageEnglish
Article number012016
Number of pages16
JournalPhysical Review D
Volume99
Issue number1
DOIs
Publication statusPublished - 31 Jan 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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