Measurement of inclusive charged-particle jet production in pp and p-Pb collisions at (Formula presented.)

Abstract

Measurements of inclusive charged-particle jet production in pp and p-Pb collisions at center-of-mass energy per nucleon-nucleon collision √ˢɴɴ = 5.02TeV and the corresponding nuclear modification factor RᶜʰpPbʲᵉᵗ are presented, using data collected with the ALICE detector at the LHC. Jets are reconstructed in the central rapidity region |ηⱼₑₜ| < 0.5 from charged particles using the anti-kᴛ algorithm with resolution parameters R = 0.2, 0.3, and 0.4. The Pᴛ-differential inclusive production cross section of charged-particle jets, as well as the corresponding cross section ratios, are reported for pp and p-Pb collisions in the transverse momentum range 10 < Pᴛᶜʰⱼₑₜ < 140 GeV/c and 10 < Pᴛᶜʰⱼₑₜ < 160 GeV/c, respectively, together with the nuclear modification factor RᶜʰpPbʲᵉᵗ in the range 10 < Pᴛᶜʰⱼₑₜ < 140 GeV/c. The analysis extends the Pᴛ range of the previously-reported charged-particle jet measurements by the ALICE Collaboration. The nuclear modification factor is found to be consistent with one and independent of the jet resolution parameter with the improved precision of this study, indicating that the possible influence of cold nuclear matter effects on the production cross section of charged-particle jets in p-Pb collisions at √ˢɴɴ = 5.02TeV is smaller tan the current precision. The obtained results are in agreement with other minimum bias jet measurements available for RHIC and LHC energies, and are well reproduced by the NLO perturbative QCD Powheg calculations with parton shower provided by Pythia8 as well as by Jetscape simulations.