Measurement of inclusive very forward jet cross sections in proton-lead collisions at root sNN=5.02 TeV

The CMS Collaboration, A. M. Sirunyan, P. Eerola, H. Kirschenmann, J. Pekkanen, M. Voutilainen, J. Havukainen, J. K. Heikkilä, T. Järvinen, V. Karimäki, R. Kinnunen, T. Lampén, K. Lassila-Perini, S. Laurila, S. Lehti, T. Lindén, P. Luukka, T. Mäenpää, H. Siikonen, E. TuominenJ. Tuominiemi, T. Tuuva

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Measurements of differential cross sections for inclusive very forward jet production in proton-lead collisions as a function of jet energy are presented. The data were collected with the CMS experiment at the LHC in the laboratory pseudorapidity range 6 : 6 < < 5 : 2. Asymmetric beam energies of 4TeV for protons and 1.58TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of p sNN = 5 : 02TeV. Collisions with either the proton (p+ Pb) or the ion (Pb+ p) traveling towards the negative hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with pT & 3 GeV, and compared to predictions from various Monte Carlo event generators. In addition, the cross section ratio of p+ Pb and Pb+ p data is presented. The results are discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the models under consideration describes all the data over the full jet-energy range and for all beam con fi gurations. Discrepancies between the di ff erential cross sections in data and model predictions of more than two orders of magnitude are observed.
Original languageEnglish
Article number043
JournalJournal of High Energy Physics
Volume2019
Issue number5
Number of pages38
ISSN1029-8479
DOIs
Publication statusPublished - 7 May 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences
  • Forward physics
  • Hadron-Hadron scattering (experiments)
  • Heavy-ion collision
  • Jets
  • COLOR GLASS CONDENSATE
  • NONLINEAR GLUON EVOLUTION
  • PARTON
  • FRAGMENTATION
  • RECOMBINATION

Cite this