We report the differential charged jet cross section and jet fragmentation distributions measured with the pffiffi ALICE detector in proton-proton collisions at a center-of-mass energy s 1⁄4 7 TeV. Jets with pseudor- apidity jηj < 0.5 are reconstructed from charged particles using the anti-kT jet-finding algorithm with a resolution parameter R 1⁄4 0.4. The jet cross section is measured in the transverse momentum interval 5 ≤ pch jet < 100 GeV=c. Jet fragmentation is studied measuring the scaled transverse momentum spectra T 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 pch jet. For pch jet > 40 GeV=c, the PYTHIA calculations also agree TT with the measured charged jet cross section. PYTHIA6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for PYTHIA8.
Charged jet cross section and fragmentation in proton-proton collisions at s =7 TeV
Barioglio L.;Beole S.;Bianchi L.;Botta E.;Ferretti A.;Gagliardi M.;Masera M.;Puccio M.;Trogolo S.;Vercellin E.;
2019-01-01
Abstract
We report the differential charged jet cross section and jet fragmentation distributions measured with the pffiffi ALICE detector in proton-proton collisions at a center-of-mass energy s 1⁄4 7 TeV. Jets with pseudor- apidity jηj < 0.5 are reconstructed from charged particles using the anti-kT jet-finding algorithm with a resolution parameter R 1⁄4 0.4. The jet cross section is measured in the transverse momentum interval 5 ≤ pch jet < 100 GeV=c. Jet fragmentation is studied measuring the scaled transverse momentum spectra T 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 pch jet. For pch jet > 40 GeV=c, the PYTHIA calculations also agree TT with the measured charged jet cross section. PYTHIA6 simulations describe the fragmentation distributions to 15%. Larger discrepancies are observed for PYTHIA8.File | Dimensione | Formato | |
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PhysRevD.99.012016.pdf
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