Abstract
The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. This global next-to-leading order QCD analysis leads to a good description of several structure functions, involving unpolarized parton distributions and helicity distributions, in terms of a rather small number of free parameters. There are many serious challenging issues. The predictions of this theoretical approach will be tested for single-jet production and charge asymmetry in W ± production in p p and pp collisions up to LHC energies, using recent data and also for forthcoming experimental results.
Highlights
Deep Inelastic Scattering (DIS) of leptons and nucleons is our main source of information to study the internal nucleon structure in terms of parton distributions
EPJ Web of Conferences recent polarized DIS data and it was demonstrated that the magnitude predicted by the statistical approach is compatible with recent BNL-RHIC data on W± production [2]
The new analysis of a larger set of recent accurate DIS data leads to the emergence of a large positive gluon helicity distribution, giving a significant contribution to the proton spin, a major point which was emphasized in a recent letter [3]
Summary
EPJ Web of Conferences recent polarized DIS data and it was demonstrated that the magnitude predicted by the statistical approach is compatible with recent BNL-RHIC data on W± production [2]. It is crucial to note that the quantum-statistical approach differs from the usual global parton fitting methodology for the following reasons: i) It incorporates physical principles to reduce the number of free parameters which have a physical interpretation ii) It has very specific predictions, so far confirmed by the data iii) It is an attempt to reach a more physical picture on our knowledge of the nucleon structure, the ultimate goal being to solve the problem of confinement iv) Treating simultaneously unpolarized distributions and helicity distributions, a unique siuation in the literature, has the advantage to give access to a vast set of experimental data, in particular up to LHC energies
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