161 research outputs found
LHC data challenges the contemporary parton-to-hadron fragmentation functions
We discuss the inclusive high-pT charged-particle production in proton-proton
collisions at the LHC. The experimental data are compared to the NLO
perturbative QCD calculations employing various sets of parton-to-hadron
fragmentation functions. Most of the theoretical predictions are found to
disastrously overpredict the measured cross sections, even if the scale
variations and PDF errors are accounted for. The problem appears to arise from
the presently too hard gluon-to-hadron fragmentation functions.Comment: Transcription of the talk given in DIS2014 conferenc
EPPS16 - Bringing nuclear PDFs to the LHC era
We report on EPPS16, the first global analysis of nuclear parton distribution
functions (nPDFs) to include LHC data. Also for the first time, a full flavour
dependence of nPDFs is allowed. While the included Z and W data are found to
have insufficient statistics to yield stringent constraints, the CMS 5.02 TeV
proton-lead dijet data prove crucial in setting the shape of nuclear gluon
modifications. With these and other observables being measured in proton-lead
runs, we are experiencing a shift of nPDFs to the LHC precision era.Comment: 6 pages, 5 figures. Prepared for the proceedings of the 12th
International Workshop on High-pT Physics in the RHIC/LHC Er
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