Valence quark distribution in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>=</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:math>nuclei

Benesh, C. J.; Goldman, T.; Stephenson, G. J.

doi:10.1103/physrevc.68.045208

Cited by 21 publications

(19 citation statements)

References 43 publications

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“…This is also the dominant mechanism in the QMC model approach to the EMC effect [24] and also similar to the quark delocalization approach [33]. The improvements given here are the explicit computation of the effects of the medium on the antiquark distributions so that consistency with the Drell-Yan data could be verified, and the reduction of the number of input parameters and model assumptions.…”

mentioning

confidence: 92%

Erratum: Chiral Solitons in Nuclei: Saturation, EMC Effect, and Drell-Yan Experiments [Phys. Rev. Lett.91, 212301 (2003)]

Smith¹,

Miller²

2007

Phys. Rev. Lett.

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The Chiral Quark-Soliton model of the nucleon contains a mechanism for an attractive interaction between nucleons. This, along with the exchange of vector mesons between nucleons, is used to compute the saturation properties of infinite nuclear matter. This provides a new way to asses the effects of the nuclear medium on a nucleon that includes valence and sea quarks. We show that the model simultaneously describes the nuclear EMC effect and the related Drell-Yan experiments.One frontier of strong interaction physics lies in the intermediate range of length scales available to present experiments where neither the fundamental theory, Quantum Chromodynamics (QCD), nor its low energy effective theory, Chiral Perturbation Theory, have useful perturbative expansions. Neither fundamental quarks nor point-like hadrons provide a complete description, so including the non-perturbative information that hadrons are bound states of valence quarks in a polarized vacuum is necessary. One way to probe these intermediate length scales and this non-perturbative physics is to examine the short distance structure of a large object. The prime example is the European Muon Collaboration (EMC) effect [1] where the short distance (∼ 5 GeV, or ∼ 10 −2 fm) structure of nuclei differs from that of a collection of free nucleons. This measurement showed that bound nucleons are different than free ones, and implied that the medium modifications could be significant for any nuclear observable [2]. Indeed, a recent paper [3] obtains evidence for a medium modification of the elastic proton form factor.Our central concern is the depletion of the nuclear structure function F A 2 (x) in the valence quark regime 0.3 < ∼ x < ∼ 0.8. While the general interpretation is that a valence quark in a bound nucleon has less momentum than in a free one, corresponding to some increased length scale, the specific mechanism for this has eluded a universally accepted explanation for 20 years [2,4,5,6]. A popular explanation is the so-called 'binding' effect which originates from a possible mechanism in which mesons binding the nucleus carry momentum. An important consequence is that the mesonic presence would enhance the anti-quark content of the nucleus [7,8]. Such an effect has not been seen in Drell-Yan experiments [9] in which a quark in a proton beam annihilates with an antiquark in a nuclear target producing a muon pair. Furthermore, relativistic treatments, including the lightcone approach needed to obtain the nucleon structure function, of the binding effect with structureless hadrons fail [10,11,12,13], suggesting that modifications of the internal quark structure of the nucleon are required to explain the deep inelastic scattering data.Any description of the EMC effect must be consistent with the constraints set by both deep inelastic scattering and Drell-Yan data. Thus a successful model must include antiquarks as well as quarks, and show how the medium modifies both the valence and sea quark distributions. Our purpose is to provide a mechanis...

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confidence: 92%

Erratum: Chiral Solitons in Nuclei: Saturation, EMC Effect, and Drell-Yan Experiments [Phys. Rev. Lett.91, 212301 (2003)]

Smith¹,

Miller²

2007

Phys. Rev. Lett.

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“…Again as we increase the nucleon size, the valence distributions are pushed to the lower values of x and their strengths are reduced. The dash-small-dash curves are our u and d quark distributions at b = 0.8 fm and the dash-doublesmall-dash curve is the d quark distribution of Benesh et al [10]. Their d quark distributions are much larger than ours.…”

Section: Result Discussion and Conclusionmentioning

confidence: 88%

“…In these calculations the nucleus wave functions have been taken into account via the spectral functions and the quark exchange effect has been assumed to be small [5][6][7][8][9][10][11]. We will present their results in this work and compare them with ours.…”

Section: Introductionmentioning

confidence: 91%

“…Recently, several groups have paid attention to the above issues [5][6][7][8][9][10][11] and they have used different models (mostly based on the impulse formalism and different spectral function approximations) to calculate the helium 3 and tritium structure functions in order to extract the neutron structure function. In these calculations the nucleus wave functions have been taken into account via the spectral functions and the quark exchange effect has been assumed to be small [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Quark exchange and valence quark distributions in mirror nuclei

Modarres

Zolfagharpour

2006

Nuclear Physics A

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“…Next we mention quark models for nuclei, which have been used in direct calculations of df. Their potential is presumably limited to the lightest nuclei [7]. Finally there are approaches, where the effect of a nuclear medium on a nucleon or a quark is replaced by mean fields [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Distribution functions for partons in nuclei

Rinat

Taragin

2005

Phys. Rev. C

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We suggest that a previously conjectured relation between Structure Functions (SF) for nuclei and nucleons also links distribution functions (df) for partons in a nucleus and in nucleons. The above suggestion ensures in principle identical results for SF F A 2 , whether computed with hadronic or partonic degrees of freedom. In practice there are differences, due to different F n 2 input. We show that the thus defined nuclear parton distribution functions (pdf) respect standard sumrules. In addition we numerically compare some moments of nuclear SF, and find agreement between results, using hadronic and partonic descriptions. We present computations of EMC ratios for both and compare those with hadronic predictions and data. In spite of substantial differences in the participating SF, the two representations produce approximately the same EMC ratios. The apparent correlation between the above deviations is ascribed to a sumrule for F A 2 . We conclude with a discussion of alternative approaches to nuclear pdf. On Distribution Functions for Partons in Nuclei AbstractWe suggest that a previously conjectured relation between Structure Functions (SF) for nuclei and nucleons also links distribution functions (df) for partons in a nucleus and in nucleons. The above suggestion ensures in principle identical results for SF F A 2 , whether computed with hadronic or partonic degrees of freedom. In practice there are differences, due to different F n 2 input. We show that the thus defined nuclear parton distribution functions (pdf) respect standard sumrules.In addition we numerically compare some moments of nuclear SF, and find agreement between results, using hadronic and partonic descriptions. We present computations of EMC ratios for both and compare those with hadronic predictions and data. In spite of substantial differences in the participating SF, the two representations produce approximately the same EMC ratios. The apparent correlation between the above deviations is ascribed to a sumrule for F A 2 . We conclude with a discussion of alternative approaches to nuclear pdf.

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Valence quark distribution inA=3nuclei

Cited by 21 publications

References 43 publications

Erratum: Chiral Solitons in Nuclei: Saturation, EMC Effect, and Drell-Yan Experiments [Phys. Rev. Lett.91, 212301 (2003)]

Erratum: Chiral Solitons in Nuclei: Saturation, EMC Effect, and Drell-Yan Experiments [Phys. Rev. Lett.91, 212301 (2003)]

Quark exchange and valence quark distributions in mirror nuclei

Distribution functions for partons in nuclei

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