The structure function ratios F2C/F2D and F2C/F2D at small x

Arneodo, M.; Arvidson, Adam Regn; Badełek, B.; Ballintijn, M.; Baum, G.; Beaufays, J.; Bird, I.; Björkholm, P.; Botje, M.; Broggini, C.; Brückner, W.; Brüll, A.; Burger, W. J.; Ciborowski, J.; Dantzig, R. van; Dyring, A.; Engelien, H.; Ferrero, M. I.; Fluri, L.; Gaul, U.; Granier, T.; Grosse‐Perdekamp, M.; Harrach, D. von; Heijden, M. van der; Heusch, C. A.; Igo, G.; Ingram, Q.; Janson-Prytz, K.; Jong, M. de; Kabuβ, E.M.; Kaiser, R.; Keßler, Hannes; Ketel, T.; Klein, Frank; Kullander, S.; Landgraf, U.; Lindqvist, T.; Mallot, G.K.; Mariotti, C.; Middelkoop, G. van; Milsztajn, A.; Mizuno, Y.; Most, A.; Mücklich, A.; Nassalski, J.; Nowotny, D.; Oberski, J.E.J.; Paić, A.; Peroni, C.; Povh, Bogdan; Rieger, R.; Rith, Klaus; Röhrich, K.; Rondio, E.; Ropelewski, L.; Sandacz, A.; Sanders, D. A.; Scholz, Christoph; Seitz, R.; Sever, F.; Shibata, T. A.; Siebler, Mario; Simon, A.; Staiano, A.; Szleper, M.; Tzamouranis, Y.; Virchaux, M.; Vuilleumier, J. L.; Walcher, Th.; Whitten, C. A.; Windmolders, R.; Witzmann, A.; Zetsche, Frank

doi:10.1016/0550-3213(95)00023-2

Cited by 146 publications

(52 citation statements)

References 35 publications

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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%

Resummed QCD Power Corrections to Nuclear Shadowing

2004

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“…However, the double ratios ( 40 Ca/D)/( 12 C/D) and ( 208 Pb/D)/( 12 C/D) of the E665 measurement are in good agreement with the NMC data [41] as well as with our predictions. Also the central points of 4 He/D, 9 Be/D and 12 C/D ratios reported in [46] are systematically above the corresponding E139 [44] and NMC [39,40] results for x > 0.3. 5 However, the slopes of the measured ratios for x > 0.2 seems to be in a good agreement for all experiments.…”

Section: Discussion and Comparison With Datamentioning

confidence: 76%

“…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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“…4 which shows the comparison of the EPS09 NLO results for F Sn 2 /F C 2 (left) and for the DY cross section ratio (right) as computed in NLO using the EPS09 nPDFs (filled squares and error bands), and as measured by NMC 95 [25,26] (open symbols with error bars). Right: The same for R A DIS (x, Q 2 ) and SLAC data [24].…”

Section: Results From Eps09mentioning

confidence: 99%

Nuclear PDFs at NLO – status report and review of the EPS09 results

2011

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We review the current status of the global DGLAP analysis of nuclear parton distribution functions, nPDFs, focusing on the recent EPS09 analysis [1], whose output, EPS09NLO, is the best-constrained NLO nPDF set on the market. Collinear factorization is found to work very well in the kinematical region studied. With the error sets released in the EPS09 package one can compute how the nPDF-related uncertainties propagate into factorizable nuclear hard-process cross sections. A comparison with the other existing NLO nPDF sets is shown, and the BRAHMS forward-η hadron data from d+Au collisions are discussed in the light of the EPS09 nPDFs and their error sets.

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The structure function ratios F2C/F2D and F2C/F2D at small x

Cited by 146 publications

References 35 publications

Resummed QCD Power Corrections to Nuclear Shadowing

Resummed QCD Power Corrections to Nuclear Shadowing

Nuclear parton distributions

Nuclear PDFs at NLO – status report and review of the EPS09 results

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