Saturation of shadowing at very low Bjorken<i>x</i>

Adams, M. R.; Aïd, S.; Anthony, P. L.; Baker, M. D.; Bartlett, J. F.; Bhatti, A.; Braun, H. M.; Busza, W.; Carroll, Timothy J.; Conrad, J. M.; Coutrakon, G.; Davisson, R.; Derado, I.; Dhawan, S.; Dougherty, W.; Dreyer, T.; Dziunikowska, K.; Eckardt, V.; Ecker, U.; Erdmann, M.; Eskreys, A.; Figiel, J.; Gebauer, H. J.; Geesaman, D. F.; Gilman, R.; Green, M. C.; Haas, J.; Halliwell, C.; Hanlon, J.; Hantke, D.; Hughes, V. W.; Jackson, H. E.; Jaffe, D. E.; Jancsó, Gábor; Jansen, D. M.; Kaufman, S.; Kennedy, Robert; Kirk, T.; Kobrak, H. G. E.; Krzywdziński, S.; Kunori, S.; Lord, J. J.; Lubatti, H. J.; McLeod, D.; Magill, S.; Malecki, Pa.; Manz, A.; Melanson, H. L.; Michael, D. G.; Mohr, W.; Montgomery, H. E.; Morfín, J.; O’Day, S.; Olkiewicz, K.; Osborne, L. S.; Papavassiliou, V.; Pawlik, B.; Pipkin, F. M.; Ramberg, E.; Röser, A.; Ryan, J. J.; Salvarani, A.; Schellman, H.; Schmitt, M.; Schmitz, N.; Schüler, K. P.; Seyerlein, H. J.; Skuja, A.; Snow, G. A.; Söldner-Rembold, S.; Steinberg, P.; Stier, H. E.; Stopa, P.; Swanson, R. A.; Talaga, R. L.; Tentindo-Repond, S.; Trost, H. J.; Venkataramania, H.; Vidal, M.; Wilhelm, Michael; Wilkes, J.; Wilson, Richard; Wittek, W.; Zhao, T.

doi:10.1103/physrevlett.68.3266

Cited by 119 publications

(71 citation statements)

References 17 publications

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“…4 we present a comparison of the model predictions with experimental data at small x Bj , from the E665 [51,52] and NMC [53,54] collaborations. One can see a quite reasonable agreement with experimental data, in spite of the absence of any free parameters in the model.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…However, this is not so for the realistic KST parametrization Eq. Figure 4: Comparison of the model with experimental data from the E665 [51,52] and NMC [53,54] collaborations. Calculations correspond to the exact numerical solution of the evolution equation for the Green function using KST [24] parametrization of the dipole cross section and a realistic nuclear density function of the Woods-Saxon form [43].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…This gives the possibility of calculating nuclear shadowing for arbitrary LC potentials Vq q (z, r, α) and nuclear density functions. Because the available data from the E665 [51,52] and NMC [53,54] collaborations cover the region of small and medium values of Q 2 ∼ < 4 GeV 2 , we prefer the KST parametrization of the dipole cross section (6), which is valid down to the limit of real photoproduction. On the contrary, the second GBW parametrization [32] of the dipole cross section cannot be applied in the nonperturbative region and therefore we do not use it in our calculations.…”

Section: Numerical Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Gluon shadowing in DIS off nuclei

Kopeliovich¹,

Nemchik²,

Potashnikova³

et al. 2008

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

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Within a light-cone quantum-chromodynamics dipole formalism based on the Green function technique, we study nuclear shadowing in deep-inelastic scattering at small Bjorken x Bj ∼ < 0.01. Such a formalism incorporates naturally color transparency and coherence length effects. Calculations of the nuclear shadowing for theqq Fock component of the photon are based on an exact numerical solution of the evolution equation for the Green function, using a realistic form of the dipole cross section and nuclear density function. Such an exact numerical solution is unavoidable for x Bj ∼ > 10 −4 , when a variation of the transverse size of theqq Fock component must be taken into account. The eikonal approximation, used so far in most other models, can be applied only at high energies, when x Bj ∼ < 10 −4 and the transverse size of theqq Fock component is "frozen" during propagation through the nuclear matter. At x Bj ≤ 0.01 we find quite a large contribution of gluon suppression to nuclear shadowing, as a shadowing correction for the higher Fock states containing gluons. Numerical results for nuclear shadowing are compared with the available data from the E665 and NMC collaborations. Nuclear shadowing is also predicted at very small x Bj corresponding to LHC kinematical range. Finally the model predictions are compared and discussed with the results obtained from other models.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Gluon shadowing in DIS off nuclei

Kopeliovich¹,

Nemchik²,

Potashnikova³

et al. 2008

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

View full text Add to dashboard Cite

show abstract

“…Also the region below x < ∼ 0.01 is not well constrained: there exist experimental DIS data, even at much lower values of x [3,6], but due to the correlation of x and Q 2 in the experiments, the values of Q 2 are in the nonperturbative region from our point of view. Also, as pointed out in [10], since ∂R…”

Section: The Framework and The Assumptionsmentioning

confidence: 96%

“…We therefore approximate f i/A (x ≥ 1, Q 2 ) = 0. For isoscalar nuclei d n/A = u p/A ≡ u A and u n/A = d p/A ≡ d A obviously hold but we have to assume that these are good approximations for non-isoscalar nuclei as well 6 . We also neglect the small nuclear effects in deuterium [27].…”

Section: The Framework and The Assumptionsmentioning

confidence: 99%

The scale dependent nuclear effects in parton distributions for practical applications

1999

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The scale dependence of the ratios of parton distributions in a proton of a nucleus A and in the free proton, R, is studied within the framework of the lowest order leading-twist DGLAP evolution. By evolving the initial nuclear distributions obtained with the GRV-LO and CTEQ4L sets at a scale Q 2 0 , we show that the ratios R A i (x, Q 2 ) are only moderately sensitive to the choice of a specific modern set of free parton distributions. We propose that to a good first approximation, this parton distribution setdependence of the nuclear ratios R A i (x, Q 2 ) can be neglected in practical applications. With this result, we offer a numerical parametrization of R A i (x, Q 2 ) for all parton flavours i in any A > 2, and at any 10 −6 ≤ x ≤ 1 and any Q 2 ≥ 2.25 GeV 2 for computing cross sections of hard processes in nuclear collisions.

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Unusual effects of diffraction dissociation for multiproduction in deep inelastic scattering on nuclei

Николаев

Захаров

Zoller

1995

Z. Physik A - Hadrons and Nuclei

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Abstract. In hadron-nucleus interactions, the stronger is nuclear shadowing in the total cross section the higher is the multiplicity of secondary hadrons. In deep inelastic scattering, nuclear shadowing at small x is associated with the hadronlike behaviour of photons as contrasted to the pointlike behaviour in the non-shadowing region of large x. In this paper we predict dilution of multiproduction of secondary hadrons, and weaker fragmentation of the target nucleus, in deep inelastic leptoptoproduction on nuclei in the shadowing region of small x as compared to the non-shadowing region of large x. This paradoxial conclusion has its origin in nuclear enhancement of the coherent diffraction dissociation of photons which affects multiproduction in the shadowing region and does not contribute in the non-shadowing region. We present numerical predictions for multiproduction in the #Xe interactions studied by the Fermilab E665 collaboration.

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Saturation of shadowing at very low Bjorkenx

Cited by 119 publications

References 17 publications

Gluon shadowing in DIS off nuclei

Gluon shadowing in DIS off nuclei

The scale dependent nuclear effects in parton distributions for practical applications

Unusual effects of diffraction dissociation for multiproduction in deep inelastic scattering on nuclei

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