Shadowing in inelastic scattering of muons on carbon, calcium and lead at lowx Bj

Adams, M. R.; Aïd, S.; Anthony, P. L.; Averill, D.; Baker, M. D.; Baller, B.; Banerjee, A.; Bhatti, A.; Bratzler, U.; Braun, H. M.; Breidung, H.; Busza, W.; Carroll, Timothy J.; Clark, H. L.; Conrad, J. M.; Davisson, R.; Derado, I.; Dhawan, S.; Dietrich, F. S.; Dougherty, W.; Dreyer, T.; Eckardt, V.; Ecker, U.; Erdmann, M.; Fang, G. Y.; Figiel, J.; Finlay, R.W.; Gebauer, H. J.; Geesaman, D. F.; Griffioen, K. A.; Guo, R. S.; Haas, J.; Halliwell, C.; Hantke, D.; Hicks, K.; Hughes, V. W.; Jackson, H. E.; Jaffe, D. E.; Jancsó, Gábor; Jansen, D. M.; Jin, Z.; Kaufman, S.; Kennedy, Robert; Kinney, E.; Kirk, T.; Kobrak, H. G. E.; Kotwal, A.; Kunori, S.; Lord, J. J.; Lubatti, H. J.; McLeod, D.; Madden, P.; Magill, S.; Manz, A.; Melanson, H. L.; Michael, D. G.; Montgomery, H. E.; Morfín, J. G.; Novák, J.; O’Day, S.; Olkiewicz, K.; Osborne, L. S.; Otten, Renee; Papavassiliou, V.; Pawlik, B.; Pipkin, F. M.; Potterveld, D. H.; Ramberg, E.; Röser, A.; Ryan, J. J.; Salgado, C.; Salvarani, A.; Schellman, H.; Schmitt, M.; Schmitz, N.; Schüler, K. P.; Siegert, G.; Skuja, A.; Snow, G. A.; Söldner-Rembold, S.; Spentzouris, P.; Stier, H. E.; Stopa, P.; Swanson, R. A.; Venkataramania, H.; Wilhelm, Michael; Wilson, Richard; Wittek, W.; Zghiche, A.; Zhao, T. C.

doi:10.1007/bf01624583

Cited by 115 publications

(48 citation statements)

References 34 publications

(16 reference statements)

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“…Fig. 2 shows a point by point in (x, Q 2 ) calculation of the process dependent modification to F 2 (A)/F 2 (D) (per nucleon) in the shadowing x < 0.1 region compared to NA37 and E665 data [13,14]. We find that a value of ξ 2 = 0.09 − 0.12 GeV 2 , which is compatible with the range from previous analysis [15] of Drell-Yan transverse momentum broadening (ξ 2 ∼ 0.04 GeV 2 ) and momentum imbalance in dijet photoproduction (ξ 2 ∼ 0.2 GeV 2 ), makes our calculations consistent with the both x-and A-dependence of the data.…”

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confidence: 99%

“…We find that a value of ξ 2 = 0.09 − 0.12 GeV 2 , which is compatible with the range from previous analysis [15] of Drell-Yan transverse momentum broadening (ξ 2 ∼ 0.04 GeV 2 ) and momentum imbalance in dijet photoproduction (ξ 2 ∼ 0.2 GeV 2 ), makes our calculations consistent with the both x-and A-dependence of the data. Our calculations might have (11) versus CERN-NA37 [14] and FNAL-E665 [13] data on DIS on nuclei. The band corresponds to the choice ξ 2 = 0.09 − 0.12 GeV 2 .…”

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confidence: 99%

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Resummed QCD Power Corrections to Nuclear Shadowing

2004

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We calculate and resum a perturbative expansion of nuclear enhanced power corrections to the structure functions measured in deeply inelastic scattering of leptons on a nuclear target. Our results for the Bjorken x-, Q 2 -and A-dependence of nuclear shadowing in F A 2 (x, Q 2 ) and the nuclear modifications to F A L (x, Q 2 ), obtained in terms of the QCD factorization approach, are consistent with the existing data. We demonstrate that the low-Q 2 behavior of these data and the measured large longitudinal structure function point to a critical role for the power corrections when compared to other theoretical approaches.PACS numbers: 12.38. Cy; 12.39.St; 24.85.+p; In order to understand the overwhelming data from the Relativistic Heavy Ion Collider (RHIC) and make predictions for the future Electron Ion Collider (EIC) and Large Hadron Collider (LHC) in terms of the successful perturbative QCD factorization approach [1] we need precise information of the nuclear parton distribution functions (nPDFs) φ A f (x, µ 2 ) of flavor f , atomic weight A, momentum fraction x and factorization scale µ. Although the µ-dependence of leading twist nPDFs can be calculated in terms of pQCD evolution equations, the x-and Adependent boundary condition at a scale µ 0 must be fixed from existing measurements, mostly of the structure function F A 2 (x, µ 2 ) in lepton-nucleus deeply inelastic scattering (DIS) [2]. It was pointed out recently [3] that the available fixed-target data contain significant higher twist effects hindering the extraction of the nuclear parton distributions.On the other hand, it has been argued that for physical processes where the effective x is very small and the typical momentum exchange of the collision Q ∼ µ is not large the number of soft partons in a nucleus may saturate [4]. Qualitatively, the unknown boundary of this novel regime in (x, Q) is where the conventional perturbative QCD factorization approach should fail [5].In this Letter we present a pQCD calculation of the resummed power corrections to the DIS nuclear structure functions and demonstrate their importance in extracting nPDFs. From our results we quantitatively identify the characteristic scale of these power corrections ξ 2 ≪ m 2 N , with nucleon mass m N = 0.94 GeV. We conclude that for Q 2 ≥ m 2 N inclusive lepton-nucleus DIS is above the saturation boundary and can be treated systematically in the framework of the pQCD factorization approach with resummed high twist contributions.Under the approximation of one-photon exchange, the lepton-hadron DIS cross section dσ ℓh /dx dQ 2 ∝ L µν W µν (x, Q 2 ), with Bjorken variable x = Q 2 /(2p · q) and virtual photon's invariant mass q 2 = −Q 2 . The leptonic tensor L µν and hadronic tensor W µν are defined in [6]. The hadronic tensor can be expressed in terms of structure functions based on the polarization states of the exchange virtual photon:, where ǫ µν L , ǫ µν T are given in [7]. The transverse and longitudinal structure functions are related to the standard DIS structure functions F 1 ,...

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confidence: 99%

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confidence: 99%

Resummed QCD Power Corrections to Nuclear Shadowing

2004

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“…We use a logarithmic scale for x < 0.1 and a linear scale for x > 0.1 for a better display of both the small x and the large x regions. [45] at low x are systematically above the corresponding NMC measurements, which have smaller uncertainties. Similarly, a normalization problem could be present for the E665 208 Pb/D data.…”

Section: Discussion and Comparison With Datamentioning

confidence: 69%

“…Figure 1. Summary of data on the ratio F A 2 /F D 2 for various nuclei from the measurements at CERN [39][40][41][42][43], SLAC [44], FNAL [45], JLab [46] and DESY [47]. The error bars represent the statistical and systematic uncertainties added in quadrature.…”

Section: Discussion and Comparison With Datamentioning

confidence: 99%

Nuclear parton distributions

Kulagin

2017

EPJ Web Conf.

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Abstract. We review a microscopic model of the nuclear parton distribution functions, which accounts for a number of nuclear effects including Fermi motion and nuclear binding, nuclear meson-exchange currents, off-shell corrections to bound nucleon distributions and nuclear shadowing. We also discuss applications of this model to a number of processes including lepton-nucleus deep inelastic scattering, proton-nucleus Drell-Yan lepton pair production at Fermilab, as well as W ± and Z 0 boson production in proton-lead collisions at the LHC.

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“…The data sets against which the best fit was found, are the DIS data from NMC [13,14,15,16] FNAL E665 [17] and SLAC E-139 [18], and the DY data from FNAL E772 [19] and FNAL E866 [20]. For the available A-systematics and other details, consult Table 1 We obtain uncertainty estimates for the initial nuclear modifications using the Hessian error matrix output provided by MINUIT (for details and refs., see again [9]).…”

Section: Resultsmentioning

confidence: 99%

Global reanalysis of nPDFs

Eskola¹

2008

Proceedings of High-pT Physics at LHC — PoS(LHC07)

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In this talk, we present the results from our recent global reanalysis of nuclear parton distribution functions (nPDFs), where the DGLAP-evolving nPDFs are constrained by nuclear hard process data from deep inelastic l + A scattering (DIS) and the Drell-Yan (DY) process in p + A collisions, and by sum rules. The main improvements over our earlier work EKS98 are the automated χ 2 minimization, better controllable fit functions and possibility for error estimates. The obtained 16-parameter fit to N = 514 datapoints is good, χ 2 /d.o.f = 0.82. Fit quality comparison and the error estimates obtained show that the old EKS98 parametrization is fully consistent with the present automated reanalysis. Comparison with other global nPDF analyses is presented as well. Within the DGLAP framework we also discuss the possibility of incorporating a clearly stronger gluon shadowing, which is suggested by the RHIC BRAHMS data from d+Au collisions. High-p T physics at LHC

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Shadowing in inelastic scattering of muons on carbon, calcium and lead at lowx Bj

Cited by 115 publications

References 34 publications

Resummed QCD Power Corrections to Nuclear Shadowing

Resummed QCD Power Corrections to Nuclear Shadowing

Nuclear parton distributions

Global reanalysis of nPDFs

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