Partial deconfinement of quarks in nuclei and the EMC effect

Gupta, Sourendu; Sarma, K.V.L.

doi:10.1007/bf01550834

Cited by 18 publications

(10 citation statements)

References 10 publications

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“…The corresponding ρ g is then usually predicted in these models. We limit the scope of our present investigations by concentrating on three different models, which are chosen as typical examples of sets of models based on similar physical concepts: (i) the gas model [24], (ii) the rescaling model [25] and (iii) the six-quark cluster model [26]. In all the three cases, we neglect QCD evolution, since such corrections are small in the kinematic range of interest to us.…”

Section: Models For Nuclear Parton Densitiesmentioning

confidence: 99%

High precision and -production data and the nuclear glue

Gavai

Godbole

1996

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

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We use the high statistics E772 data on the nuclear dependence of the production of quarkonia (J /ψ and ϒ) and dimuons at large transverse momentum (p T ) in p-A collisions to get information about the gluonic EMC effect. We find a satisfactory quantitative agreement of the theoretical predictions with the data, although none of the models of the EMC effect we consider could account for the entire data. Nonetheless, our results suggest that these data can now be used for a better determination of the nuclear parton densities. Our conclusions are shown to be insensitive to the hadronization mechanism for the quarkonia.

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Section: Models For Nuclear Parton Densitiesmentioning

confidence: 99%

High precision and -production data and the nuclear glue

Gavai

Godbole

1996

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

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“…Fig. 1 The predictions of the gas [11], rescaling [12], and quark-cluster model [13], for the ratio of the nuclear gluon density g A to that of the nucleon ρ g , for A = 56, as a function of x, the momentum fraction. The corresponding values of p T for the FNAL fixed-target energy, √ s = 38.75 GeV, are shown on the top axis.…”

Section: Figure Captionsmentioning

confidence: 99%

“…In order to illustrate the effectiveness of this process in differentiating between different models of the EMC effect, we have chosen three representative cases. These are a) the gas model [11], b) the rescaling model [12], and c) the six-quark cluster model [13]. As was already mentioned, in all these models the construction of nuclear parton densities starts from a choice of nucleon parton densities.…”

mentioning

confidence: 99%

“…In this case it will not even be necessary to measure the triple differential cross-section and a measurement of dσ/dp T will suffice to distinguish between the different models. The predictions of the gas [11], rescaling [12], and quark-cluster model [13], for the ratio of the nuclear gluon density g A to that of the nucleon ρ g , for A = 56, as a function of x, the momentum fraction. The corresponding values of p T for the FNAL fixed-target energy, √ s = 38.75 GeV, are shown on the top axis.…”

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confidence: 99%

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Looking for the gluonic EMC effect in associated J/ψ+γ production

Gavai¹,

Godbole²,

Sridhar³

1993

Physics Letters B

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We study the associated production of J/ψ + γ in fixed-target experiments with nuclear targets as well as at the relativistic heavy-ion collider (RHIC). We find that this process affords a very clean probe of ρ g , the ratio of gluon density in a heavy nucleus to that of a proton. The combined x range thus available can be used to discriminate between the predictions of different models of the EMC effect for ρ g . a) gavai%theory@tifrvax b) rohini%theory@tifrvax c) sridhar@vxcern.cern.ch

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“…While many exciting and imaginative ideas about the origin of the EMC effect were explored soon after its discovery, [7][8][9][10][11][12][13][14][15][16][17][18][19] very few are still widely considered viable. We focus on two possibilities here, namely the change in internal structure generated by the mean scalar field in a nucleus and alternatively the potential effect on highly correlated nucleons of being far off-mass shell.…”

Section: Introductionmentioning

confidence: 99%

Reflections on the origin of the EMC effect

Thomas

2018

Int. J. Mod. Phys. E

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In the 35 years since the European Muon Collaboration announced the astonishing result that the valence structure of a nucleus was very different from that of a free nucleon, many explanations have been suggested. The first of the two most promising explanations is based upon the different effects of the strong Lorentz scalar and vector mean fields known to exist in a nucleus on the internal structure of the nucleon-like clusters which occupy shell model states. The second links the effect to the modification of the structure of nucleons involved in short-range correlations, which are far off their mass shell. We explore some of the methods which have been proposed to give complementary information on this puzzle, especially the spin-dependent EMC effect and the isovector EMC effect, both proposed by Cloët, Bentz and Thomas. It is shown that the predictions for the spin dependent EMC effect, in particular, differ substantially within the mean-field and short-range correlation approaches. Hence the measurement of the spin dependent EMC effect at Jefferson Lab should give us a deeper understanding of the origin of the EMC effect and, indeed, of the structure of atomic nuclei.

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Partial deconfinement of quarks in nuclei and the EMC effect

Cited by 18 publications

References 10 publications

High precision and -production data and the nuclear glue

High precision and -production data and the nuclear glue

Looking for the gluonic EMC effect in associated J/ψ+γ production

Reflections on the origin of the EMC effect

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