A new evaluation of polarized parton densities in the nucleon

Leader, Elliot; Сидоров, А. В.; Stamenov, Dimiter B.

doi:10.1007/s100520200901

Cited by 77 publications

(132 citation statements)

References 18 publications

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“…The main features of our distributions agree with other sets available in the literature, both in the unpolarized case [45,46] see Fig. 23 and in the polarized case [47,48,49]. We show in Fig.…”

Section: Discussionsupporting

confidence: 91%

The statistical parton distributions: status and prospects

2005

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New experimental results on polarized structure functions, cross sections for e ± p neutral and charge current reactions and ν (ν) charge current on isoscalar targets are compared with predictions using the statistical parton distributions, which were previously determined. New data on cross sections for Drell-Yan processes, single jet in pp collisions and inclusive π 0 production in pp collisions are also compared with predictions from this theoretical approach. The good agreement which we find with all these tests against experiment, strenghtens our opinion on the relevance of the role of quantum statistics for parton distributions. We will also discuss the prospects of this physical framework.

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Section: Discussionsupporting

confidence: 91%

The statistical parton distributions: status and prospects

2005

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“…To avoid numerical problems with the integrals in the low x region we have followed the procedure explained in [8]. Throughout this work we have taken the parameterization MRST 2001 NLO [16] for the unpolarized parton distributions and the parameterization LSS01 [17] for the polarized ones. Concerning the helicity flip nucleon GPDs, E q and E q , we can safely neglect the latter since we deal with an isoscalar target.…”

Section: Modelling Nucleon Gpdsmentioning

confidence: 99%

Deep electroproduction of photons and mesons on the deuteron

2004

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Abstract. We study deeply virtual Compton scattering and deep exclusive meson electroproduction on a deuteron target. We model the Generalized Quark Distributions in the deuteron by using the impulse approximation for the lowest Fock-space state on the light-cone. We study the properties of the resulting GPDs, and verify that sum rules violations are quite small in the impulse approximation. Numerical predictions are given for the unpolarized cross sections and polarization asymmetries for the kinematical regimes relevant for JLab experiments and for HERMES at HERA. We conclude that the signal of coherent scattering on the deuteron is comparable to the one on the proton at least for low momentum transfer, providing support to the feasibility of the experiments. The short distance structure of the deuteron may thus be scrutinized in the near future.

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“…In the following estimates we take the unpolarized parton distributions at input scale Q For the polarized parton distributions, we adopt the recent NLO analysis of Ref. [40], which at input scale Q For the GPD E, whose forward limit is unknown, we adopt a valence parametrization multiplied with (1 − x) 2 to be consistent with the x → 1 limit [41]. This gives…”

Section: The Handbag Calculation Of the Two-photon Exchange Contrmentioning

confidence: 99%

Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer

et al. 2005

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We estimate the two-photon exchange contribution to elastic electron-proton scattering at large momentum transfer by using a quark-parton representation of virtual Compton scattering. We thus can relate the two-photon exchange amplitude to the generalized parton distributions which also enter in other wide angle scattering processes. We find that the interference of one-and two-photon exchange contribution is able to substantially resolve the difference between electric form factor measurements from Rosenbluth and polarization transfer experiments. Two-photon exchange has additional consequences which could be experimentally observed, including nonzero polarization effects and a positron-proton/electron-proton scattering asymmetry. The predicted Rosenbluth plot is no longer precisely linear; it acquires a measurable curvature, particularly at large laboratory angle.

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A new evaluation of polarized parton densities in the nucleon

Abstract: We present a new leading and next-to-leading QCD analysis of the world data on inclusive polarized deep inelastic scattering. A new set of polarized parton densities is extracted from the data and the sensitivity of the results to the newly incorporated SLAC/E155 proton data is discussed.

Cited by 77 publications

References 18 publications

The statistical parton distributions: status and prospects

The statistical parton distributions: status and prospects

Deep electroproduction of photons and mesons on the deuteron

Two-photon exchange contribution to elastic electron-nucleonscattering at large momentum transfer

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