A measurement of the spin asymmetry and determination of the structure function g1 in deep inelastic muon-proton scattering

A global next-to-leading order QCD analysis of unpolarized and polarized deepinelastic scattering data is performed with parton distributions constructed in a statistical physical picture of the nucleon. The chiral properties of QCD lead to strong relations between quarks and antiquarks distributions and the importance of the Pauli exclusion principle is also emphasized. We obtain a good description, in a broad range of x and Q 2 , of all measured structure functions in terms of very few free parameters.We stress the fact that at RHIC-BNL the ratio of the unpolarized cross sections for the production of W + and W − in pp collisions, will directly probe the behavior of the d(x)/u(x) ratio for x ≥ 0.2, a definite and important test for the statistical model. Finally, we give specific predictions for various helicity asymmetries for the W ± , Z production in pp collisions at high energies, which will be measured with forthcoming experiments at RHIC-BNL and are sensitive tests of the statistical model for ∆u (x) and ∆d(x).

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“…In the case where the u quark dominates, we get [43]- [45]. The curves correspond to our model predictions at Q 2 = 4GeV 2 .…”

Section: Experimental Tests For Polarized Dissupporting

confidence: 63%

A statistical approach for polarized parton distributions

2002

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“…This is much smaller in magnitude than the corresponding number in Ref. [29] as well as the expected value from the Bjorken sum rule (using the EMC's result for the integral of g~i(z) [7,8] We recall that in the calculation of the neutron electric form factor, for example, this is not possible as both effects lead to a negative charge square radius [14,36].…”

Section: Numerical Resultsmentioning

confidence: 73%

“…In this the nucleon consists of three massless relativistic quarks, carrying its quantum numbers such as its spin and flavor, confined within a finite volume by a "bag" surface. Deep-inelastic scattering within this model has been calculated previously (see [6] [7,8). The European Muon Collaboration (EMC) results indicate that the major part of the proton spin does not seem to be carried by (current) …”

Section: Introductionmentioning

confidence: 99%

Pion cloud of the nucleon and its effect on deep-inelastic structure

et al. 1992

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3. The right to use all or part of the Article, including the APS-prepared version without revision or modification, on the author(s)' web home page or employer's website and to make copies of all or part of the Article, including the APS-prepared version without revision or modification, for the author(s)' and/or the employer's use for educational or research purposes." April 2016PHYSICAL REVIE%' 0 VOLUME 45, NUMBER 9 1 MAY 1992 In this paper we present the calculation of deep-inelastic scattering structure functions of nucleons dressed by pions. The calculation is performed within the convolution model. We present analytic results for quark and antiquark distributions of a given Savor and spin and numerical results on those. structure functions that are likely to be most affected by the dressing of the nucleon. We allow for the probe scattering off both nucleons and 4's. Diagrams where it scatters off the pions themselves are not taken into account. For the numerical results we look only at combinations of structure functions where these do not contribute.

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“…The largest amount of discussions have been stimulated by the polarized deep inelastic lepton nucleon scattering (DIS) measurements [1]. These results suggest that the angular momentum of the nucleon is not distributed among its parton constituents in the way expected in naïve quark models.…”

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confidence: 99%

$\Lambda$ and $\overline{\Lambda}$ polarization in lepton induced processes

1998

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The study of the longitudinal polarization of Λ and Λ hyperons produced in polarized deep inelastic scattering, neutrino scattering, and in Z 0 decays allows one to access the spin dynamics of the quark fragmentation process. Different phenomenological spin transfer mechanisms are considered and predictions for the Λ and Λ longitudinal polarization in various processes using unpolarized and polarized targets are made. Current and future semi-inclusive deep inelastic scattering experiments will soon provide accurate enough data to study these phenomena and distinguish between various models for the spin transfer mechanisms.

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A measurement of the spin asymmetry and determination of the structure function g1 in deep inelastic muon-proton scattering

Cited by 1,534 publications

References 36 publications

A statistical approach for polarized parton distributions

A statistical approach for polarized parton distributions

Pion cloud of the nucleon and its effect on deep-inelastic structure

$\Lambda$ and $\overline{\Lambda}$ polarization in lepton induced processes

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