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arxiv 1004.3062 v2 pith:BKT6IU7X submitted 2010-04-18 hep-ph nucl-exnucl-th

Structure functions for light nuclei

classification hep-ph nucl-exnucl-th
keywords datanuclearnucleiagreemente03-103goodstructureanalysis
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We discuss the nuclear EMC effect with particular emphasis on recent data for light nuclei including 2H, 3He, 4He, 9Be, 12C and 14N. In order to verify the consistency of available data, we calculate the \chi^2 deviation between different data sets. We find a good agreement between the results from the NMC, SLAC E139, and HERMES experiments. However, our analysis indicates an overall normalization offset of about 2% in the data from the recent JLab E03-103 experiment with respect to previous data for nuclei heavier than 3He. We also discuss the extraction of the neutron/proton structure function ratio F2n/F2p from the nuclear ratios 3He/2H and 2H/1H. Our analysis shows that the E03-103 data on 3He/2H require a renormalization of about 3% in order to be consistent with the F2n/F2p ratio obtained from the NMC experiment. After such a renormalization, the 3He data from the E03-103 data and HERMES experiments are in a good agreement. Finally, we present a detailed comparison between data and model calculations, which include a description of the nuclear binding, Fermi motion and off-shell corrections to the structure functions of bound proton and neutron, as well as the nuclear pion and shadowing corrections. Overall, a good agreement with the available data for all nuclei is obtained.

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Cited by 2 Pith papers

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  1. Stability of parton distributions at high $x$: impact of nuclear and power corrections

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    Global fit finds u and d PDFs stable to x≈0.8 with positive isospin-independent higher-twist corrections and nonzero off-shell nucleon contributions required to describe nuclear data.

  2. On the Cancellation of Nuclear Effects in the Valence Region

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    World data on isoscalar DIS cross-section ratios exhibit near-perfect cancellation of nuclear effects in the valence region 0.25 ≤ x ≤ 0.35 across nuclei.