Evidence for enhancement of gluon and valence-quark distributions in nuclei from hard lepton-nucleus processes

Frankfurt, L.; Strikman, M.; Liuti, Simonetta

doi:10.1103/physrevlett.65.1725

Cited by 98 publications

(134 citation statements)

References 5 publications

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“…This observation is in agreement with an analysis of NMC data for inelastic J/ψ-leptoproduction [110] as indicated in Fig.5.14. The enhancement of nuclear gluon distributions around x ≃ 0.1 is consistent with the fact that the total momentum of hadrons is given by the sum of the momenta of its parton constituents [108,127]. The empirical information Results from Ref.…”

Section: Nuclear Parton Distributions At Small Xsupporting

confidence: 53%

“…In Ref. [108] it was suggested that at such distances inter-nucleon forces are a result of quark and gluon exchange leading to the observed enhancement. In such a picture the enhancement of gluons should increase with the density of the nuclear target.…”

Section: Nuclear Parton Distributions At Small Xmentioning

confidence: 99%

“…Nuclear effects in valence and sea quark distributions can be further disentangled using Drell-Yan dilepton production data [108,127]. The E772 collaboration at FNAL has found shadowing for nuclear antiquark distributions at x < 0.1 but no enhancement as discussed in Section 3.6.1.…”

Section: Nuclear Parton Distributions At Small Xmentioning

confidence: 99%

“…At x T < 0.1, on the other hand, the observed attenuation for heavy nuclei implies a substantial reduction of nuclear sea quarks, in qualitative agreement with the shadowing effects observed in nuclear deep-inelastic scattering at x < 0.1. The detailed comparison of shadowing in Drell-Yan versus DIS requires, of course, a careful separation of valence and sea quark effects as well as their Q 2 evolution [108].…”

Section: Drell-yan Lepton Pair Productionmentioning

confidence: 99%

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Nuclear deep-inelastic lepton scattering and coherence phenomena

Piller¹,

Weise²

2000

Physics Reports

175

241

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This review outlines our present experimental knowledge and theoretical understanding of deepinelastic scattering on nuclear targets. The emphasis is primarily on nuclear coherence phenomena, such as shadowing, where the key physics issue is the exploration of hadronic and quark-gluon fluctuations of a high-energy virtual photon and their passage through the nuclear medium. New developments in polarized deep-inelastic scattering on nuclei are also discussed, and more conventional binding and Fermi motion effects are summarized. The report closes with a brief outlook on vector meson electroproduction, nuclear shadowing at very large Q 2 and the physics of high parton densities in QCD.

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Section: Nuclear Parton Distributions At Small Xsupporting

confidence: 53%

Section: Nuclear Parton Distributions At Small Xmentioning

confidence: 99%

Section: Nuclear Parton Distributions At Small Xmentioning

confidence: 99%

Section: Drell-yan Lepton Pair Productionmentioning

confidence: 99%

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Nuclear deep-inelastic lepton scattering and coherence phenomena

Piller¹,

Weise²

2000

Physics Reports

175

241

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“…There are two restrictions on the valence-quark distributions in a nucleus. One is the baryon number conservation [16], and the other is the charge conservation [12]. Nuclear baryon number and charge have to be A and Z, and they are expressed in the parton model as…”

Section: Modified Paschos-wolfenstein Relation For Nucleimentioning

confidence: 99%

Modified Paschos-Wolfenstein relation and extraction of the weak mixing anglesin2θW

Kumano

2002

Phys. Rev. D

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The NuTeV collaboration reported anomalously large weak mixing angle sin 2 θW in comparison with the standard model prediction. Neutrino and antineutrino charged-and neutral-current events are analyzed for extracting sin 2 θW . Although the Paschos-Wolfenstein relation is not directly used in the analysis, it plays an important role in the determination. Noting that the target nucleus, iron, is not an isoscalar nucleus, we derive a leading-order expression for a modified Paschos-Wolfenstein relation for nuclei, which may have neutron excess. Then, using charge and baryon-number conservations for nuclei, we discuss a nuclear correction in the sin 2 θW determination. It is noteworthy that nuclear modifications are different between valence up-and down-quark distributions. We show this difference effect on the NuTeV sin 2 θW deviation.

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