New parton distributions in a fixed flavour factorization scheme from recent deep-inelastic-scattering data

Abstract

We present our QCD analysis of the proton structure function to determine the parton distributions at the next-to-leading order. The heavy quark contributions to , with i = c, b have been included in the framework of the ‘fixed flavour number scheme’ (FFNS). The results obtained in the FFNS are compared with available results such as the general-mass variable-flavour-number scheme and other techniques used in global QCD fits of parton distribution functions. In the present QCD analysis, we use a wide range of the inclusive neutral-current deep-inelastic-scattering (NC DIS) data, including the most recent data for charm , bottom , longitudinal FL structure functions and also the reduced DIS cross sections from HERA experiments. The most recent HERMES data for proton and deuteron structure functions are also added. We take into account ZEUS neutral current e±p DIS inclusive jet cross-section data from HERA together with the recent Tevatron Run-II inclusive jet cross-section data from CDF and DØ. The impact of this recent DIS data on the PDFs extracted from the global fits are studied. We present two families of PDFs, KKT12 and KKT12C, without and with HERA ‘combined’ data sets on e±p DIS. We find these are in good agreement with the available theoretical models.