Measurement of inclusive very forward jet cross sections in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV

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 $<$ $\eta$ $<$ $-$5.2. Asymmetric beam energies of 4 TeV for protons and 1.58 TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV. Collisions with either the proton (p+Pb) or the ion (Pb+p) traveling towards the negative $\eta$ hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with $p_{\mathrm{T}}$ $\gtrsim$ 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 configurations. Discrepancies between the differential cross sections in data and model predictions of more than two orders of magnitude are observed.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/FSQ-17-001 (CMS Public Pages)

References in corpus (51)

• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• New parton distributions for collider physics
• Computing Quark and Gluon Distribution Functions for Very Large Nuclei
• Operator expansion for high-energy scattering
• Gluon Distribution Functions for Very Large Nuclei at Small Transverse Momentum
• Small-x F_2 Structure Function of a Nucleus Including Multiple Pomeron Exchanges
• Dispelling the N^3 myth for the Kt jet-finder
• EPOS LHC : test of collective hadronization with LHC data
• Nonlinear Gluon Evolution in the Color Glass Condensate: I
• The Color Glass Condensate
• Green's Functions in the Color Field of a Large Nucleus
• The BFKL Equation from the Wilson Renormalization Group
• Nonlinear Gluon Evolution in the Color Glass Condensate: II
• HIJING 1.0: A Monte Carlo Program for Parton and Particle Production in High Energy Hadronic and Nuclear Collisions
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Combined Measurement and QCD Analysis of the Inclusive ep Scattering Cross Sections at HERA
• Unitarity at small Bjorken x
• The Wilson renormalization group for low x physics: Gluon evolution at finite parton density
• Parton-Based Gribov-Regge Theory
• The Color Glass Condensate and hadron production in the forward region
• Measurement of inclusive jet and dijet production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/psi production in proton-proton collisions at sqrt(s) = 7 TeV
• The CCFM Monte Carlo generator CASCADE 2.2.0
• Measurement of inclusive jet and dijet cross sections in proton-proton collisions at 7 TeV centre-of-mass energy with the ATLAS detector
• CGC predictions for p+Pb collisions at the LHC
• Centrality and rapidity dependence of inclusive jet production in $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV proton-lead collisions with the ATLAS detector
• Gluon saturation in dijet production in p-Pb collisions at Large Hadron Collider
• Forward Jet Production at the Large Hadron Collider
• Measurement of dijet cross sections in pp collisions at 7 TeV centre-of-mass energy using the ATLAS detector
• Measurement of dijet production with a veto on additional central jet activity in pp collisions at sqrt(s)=7 TeV using the ATLAS detector
• Dijet Azimuthal Decorrelations in pp Collisions at sqrt(s) = 7 TeV
• Measurement of charged jet production cross sections and nuclear modification in p-Pb collisions at $\sqrt{s_\rm{NN}} = 5.02$ TeV
• Measurement of the differential dijet production cross section in proton-proton collisions at sqrt(s)=7 TeV
• Measurement of the inclusive production cross sections for forward jets and for dijet events with one forward and one central jet in pp collisions at sqrt(s) = 7 TeV
• Measurements of jet vetoes and azimuthal decorrelations in dijet events produced in $pp$ collisions at $\sqrt{s}$ = 7 TeV using the ATLAS detector
• Azimuthal decorrelation of jets widely separated in rapidity in pp collisions at sqrt(s) = 7 TeV
• Ratios of dijet production cross sections as a function of the absolute difference in rapidity between jets in proton-proton collisions at sqrt(s) = 7 TeV
• Measurement of inclusive jet production and nuclear modifications in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Dijet production in $\sqrt{s}=7$ TeV $pp$ collisions with large rapidity gaps at the ATLAS experiment
• Measurement of the triple-differential dijet cross section in proton-proton collisions at sqrt(s) = 8 TeV and constraints on parton distribution functions
• On the use of a running coupling in the NLO calculation of forward hadron production
• Measurement of the inelastic cross section in proton-lead collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV
• Measurement of dijet azimuthal decorrelation in pp collisions at sqrt(s) = 8 TeV
• Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at sqrt(s) = 13 TeV
• Saturation in inclusive production beyond leading logarithm accuracy
• Single inclusive jet production and the nuclear modification ratio at very forward rapidity in proton-lead collisions with $\sqrt{s_{NN}}$ = 5.02 TeV
• Ultra-forward particle production from CGC+Lund fragmentation

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• Overview of high-density QCD studies with the CMS experiment at the LHC
• Saturation and forward jets in proton-lead collisions at the LHC
• The very forward CASTOR calorimeter of the CMS experiment
• Pushing forward jet substructure measurements in heavy-ion collisions
• Forward Inclusive Jet Productions in pA Collisions
• Hard color-singlet exchange in dijet events in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Medium-Induced Transverse Momentum Broadening via Forward Dijet Correlations
• Evidence for a QCD accelerator in relativistic heavy-ion collisions
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Latest results on Soft QCD and DPS from the CMS experiment
• Review of results on forward physics and diffraction by CMS