The improved nuclear parton distributions

Filho, A. L. Ayala; Gonçalves, V. P.

doi:10.1007/s100520100654

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…But one should take into account that in DGLAP approaches the small x behaviour at Q 2 close to Q 2 0 comes mainly from the assumptions for the initial conditions. The model [107] gives results for R Pb F 2 at Q 2 = 2.25 GeV 2 very close to those of [99, 103] at x = 0.01 where the considered high-density corrections are almost negligible, but sizably smaller, R Pb F 2 0.43, at x = 10 −5 . These predictions could be checked in the EIC [24], where values of x ∼ 3 × 10 −4 at Q 2 ∼ 1 GeV 2 should become accessible, or in ultra-peripheral proton-ion or ion-ion collisions (UPC) [115,116].…”

Section: Comparison Among Different Modelssupporting

confidence: 80%

“…15 and the mentioned discussion in Section 3; [120] gives R Pb g ∼ 0.7 at x = 0.01 and ∼ 0.2 at x = 10 −5 for Q 2 = 6.5 GeV 2 . The model [107] gives results for R Pb g at Q 2 = 2.25 GeV 2 very close to those of [99,103] at x = 0.01 -as it was the case for R F 2 , but sizably smaller, R Pb F 2 ≃ 0.37, at x = 10 −5 . Finally, [42] gives R Pb g ∼ 0.95 at x = 0.01 and ∼ 0.75 at x = 10 −4 for Q 2 = 4 GeV 2 .…”

Section: Comparison Among Different Modelssupporting

confidence: 64%

“…The DGLAP equations establish a relation between the logarithmic Q 2 -evolution of the structure functions and the gluon distribution [109]. Such relation, valid at LO and small x, has been extended to the nuclear ratios [110]: [107] uses Glauber-like rescatterings to effectively include some high-density corrections to the parametrizations [99,103]. These corrections lead to a shadowing which does not saturate at small x, and which increases with increasing Q 2 for small x 10 In this way,…”

Section: Models Based On Dglap Evolutionmentioning

confidence: 99%

“…The high-density QCD approach does not correspond to a fixed order in the power expansion but re-sums, in some limit, all power-suppressed contributions 12. The model[107] uses Glauber-like rescatterings to effectively include some high-density corrections to the parametrizations[99,103]. These corrections lead to a shadowing which does not saturate at small x and which increases with increasing Q 2 for small x 10 −4 .…”

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confidence: 99%

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Nuclear shadowing

Armesto¹

2006

J. Phys. G: Nucl. Part. Phys.

225

233

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The phenomenon of shadowing of nuclear structure functions at small values of Bjorken-x is analyzed. First, multiple scattering is discussed as the underlying physical mechanism. In this context three different but related approaches are presented: Glauber-like rescatterings, Gribov inelastic shadowing and ideas based on high-density Quantum Chromodynamics. Next, different parametrizations of nuclear partonic distributions based on fit analysis to existing data combined with Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution, are reviewed. Finally, a comparison of the different approaches is shown, and a few phenomenological consequences of nuclear shadowing in high-energy nuclear collisions are presented. * The use of such parametrizations can be justified at large enough Q 2 by the factorization theorem for diffractive hard scattering [75].

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Section: Comparison Among Different Modelssupporting

confidence: 80%

Section: Comparison Among Different Modelssupporting

confidence: 64%

Section: Models Based On Dglap Evolutionmentioning

confidence: 99%

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confidence: 99%

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Nuclear shadowing

Armesto¹

2006

J. Phys. G: Nucl. Part. Phys.

225

233

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Quarkonium suppression as a probe of a saturated gluon plasma?

Gonçalves

2001

Physics Letters B

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A dense parton system is expected to be formed in the early stage of relativistic heavy-ion collisions at RHIC energies and above. The probability of a quark gluon plasma production and the resulting strength of its signatures depends strongly on the initial conditions associated to the distributions of partons in the nuclear wave functions. At very high energies, the growth of parton distributions should saturate, possibly forming a Color Glass Condensate, which is characterized by a bulk momentum scale Q s . As a direct consequence, the possible signatures of the QGP should be Q s -dependent if the saturation scenario is valid for RHIC and LHC. In this Letter we assume the saturation scenario for the QGP formation and estimate the saturation scale dependence of quarkonium suppression. We conclude that, if this scenario is valid, the Υ suppression only occurs at large values of Q s .

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Constraints for nuclear gluon shadowing from DIS data

et al. 2002

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The $Q^2$ dependence of the ratios of the cross sections of deep inelastic lepton--nucleus scattering is studied in the framework of leading twist, lowest order perturbative QCD. The $\log Q^2$ slope of the ratio $F_2^{\rm Sn}/F_2^{\rm C}$ is computed by using the DGLAP evolution equations, and shown to be sensitive to the nuclear gluon distribution functions. Four different parametrizations for the nuclear effects of parton distributions are studied. We show that the NMC data on the $Q^2$ dependence of $F_2^{\rm Sn}/F_2^{\rm C}$ rule out the case where nuclear shadowing (suppression) of gluons at $x\sim 0.01$ is much larger than the shadowing observed in the ratio $F_2^A/F_2^{\rm D}$. We also show that the possible nonlinear correction terms due to gluon fusion in the evolution equations do not change this conclusion. Some consequences for computation of RHIC multiplicities, which probe the region $x\gsim0.01$, are also discussed.Comment: 11 pages, 3 eps figure

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The improved nuclear parton distributions

Cited by 9 publications

References 12 publications

Nuclear shadowing

Nuclear shadowing

Quarkonium suppression as a probe of a saturated gluon plasma?

Constraints for nuclear gluon shadowing from DIS data

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