Measurement of the EMC effect in light and heavy nuclei

Arrington, J.; Bane, J.; Daniel, A.; Fomin, N.; Gaskell, D.; Seely, J.; Asaturyan, R.; Benmokhtar, F.; Boeglin, W.; Bosted, P.; Bukhari, M. H. S.; Christy, M. E.; Connell, S. H.; Dalton, M. M.; Day, D.; Dunne, J.; Dutta, D.; Fassi, L. El; Ent, R.; Fenker, H.; Gao, H.; Horn, T.; Hungerford, E. V.; Jones, M. K.; Jourdan, J.; Kalantarians, N.; Keppel, C. E.; Kiselev, D.; Lung, A.; Malace, S.; Meekins, D.; Mertens, T.; Mkrtchyan, H.; Niculescu, G.; Niculescu, I.; Potterveld, D. H.; Perdrisat, C. F.; Punjabi, V.; Qian, X.; Reimer, P.; Roche, J.; Rodriguez, V. M.; Rondon, O.; Schulte, E.; Slifer, K.; Smith, G. R.; Solvignon, P.; Tadevosyan, V.; Tang, L.; Testa, G.; Trojer, R.; Tvaskis, V.; Wesselmann, F. R.; Wood, S. A.; Yuan, L.; Zheng, X.

doi:10.1103/physrevc.104.065203

Cited by 26 publications

(11 citation statements)

References 108 publications

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“…[80,81], many experiments have used the deuteron. However, despite being a weakly bound system, numerous nuclear physics effects introduce a large theory uncertainty in the extracted ratio on x 0.7 [82,83]. It has been argued [84,85] that one may instead obtain a sound result for F n 2 (x)/F p 2 (x) by forming the ratio of deep inelastic scattering measurements on 3 He and 3 H. Data from such an experiment are now available [34].…”

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confidence: 99%

Parton distributions of light quarks and antiquarks in the proton

Chang,

Gao,

Roberts

2022

Preprint

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An algebraic Ansatz for the proton's Poincaré-covariant wave function, which includes both scalar and pseudovector diquark correlations, is used to calculate proton valence, sea, and glue distribution functions (DFs). Regarding contemporary data, a material pseudovector diquark component in the proton is necessary for an explanation of the neutron-proton structure function ratio; and a modest Pauli blocking effect in the gluon splitting function is sufficient to explain the proton's light-quark antimatter asymmetry. In comparison with pion DFs, the valence degrees-of-freedom in both proton and pion carry the same fraction of the host hadron's light-front momentum, but at a resolving scale typical of contemporary experiments, sea-quarks in the proton carry roughly 30% more momentum than their analogues in the pion and the proton glue fraction is 7% smaller. Understanding these differences may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

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confidence: 99%

Parton distributions of light quarks and antiquarks in the proton

Chang,

Gao,

Roberts

2022

Preprint

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“…It is also worth noting that the EMC ratios from the CLAS experiment for all targets (in addition to 12 C, the CLAS results include 27 Al, 56 Fe, and 208 Pb) are systematically larger than those from other experiments, as discussed in Ref. [18].…”

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confidence: 78%

“…As described in Ref. [18], we use the effective cross sections for nucleons bound in the deuteron [26] to evaluate σ n /σ p . A correction is also applied to account for acceleration (deceleration) of the incoming (outgoing) electrons in the Coulomb field of the nucleus.…”

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confidence: 99%

“…An additional 0.5% normalization uncertainty was assigned to account for possible acceptance issues hypothesized to explain the difference in EMC ratios observed between the SHMS and HMS. A renormalization factor (to be discussed below) was also applied, and we apply a 1% un-0.30 0.45 0.60 0.75 0.90 0.9 [18] (open red circles) as well as those from SLAC E139 [19] (open black squares). Also shown are the carbon results from JLab CLAS at 6 GeV [9] (green stars).…”

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confidence: 99%

“…The size of the EMC effect can be more precisely described using the magnitude of the slope, |dR EMC /dx| in the region 0.3 < x < 0.7 (the "EMC region"). These slopes are shown in Figure 2 [18], open squares from SLAC E139 [19], and the open star from CLAS at 6 GeV [9]. Some points have been offset horizontally for visibility.…”

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confidence: 99%

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First Measurement of the EMC Effect in $^{10}$B and $^{11}$B

Karki,

Biswas,

Gonzalez

et al. 2022

Preprint

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The nuclear dependence of the inclusive inelastic electron scattering cross section (the EMC effect) has been measured for the first time in 10 B and 11 B. Previous measurements of the EMC effect in A ≤ 12 nuclei showed an unexpected nuclear dependence; 10 B and 11 B were measured to explore the EMC effect in this region in more detail. Results are presented for 9 Be, 10 B, 11 B, and 12 C at an incident beam energy of 10.6 GeV. The EMC effect in the boron isotopes was found to be similar to that for 9 Be and 12 C, yielding almost no nuclear dependence in the EMC effect in the range A = 4 − 12. This represents important, new data supporting the hypothesis that the EMC effect depends primarily on the local nuclear environment due to the cluster structure of these nuclei.

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