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arXiv · 1207.0131

Impact of nuclear dependence of R=σ_L/σ_T on antishadowing in nuclear structure functions

V. Guzey·L. Zhu·C. Keppel·M. Eric Christy·D. Gaskell·P. Solvignon·A. Accardi
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Abstract

We study the impact of the nuclear dependence of R=σ_L/σ_T on the extraction of the F_2^A/F_2^D and F_1^A/F_1^D structure function ratios from the data on the σ^A/σ^D cross section ratios. Guided by indications of the nuclear dependence of R from the world data, we examine selected sets of EMC, BCDMS, NMC and SLAC data and find that F_1^A/F_1^D < σ^A/σ^D \leq F_2^A/F_2^D. In particular, we observe that the nuclear enhancement (antishadowing) for F_1^A/F_1^D in the interval 0.1 < x < 0.3 becomes significantly reduced or even disappears, which indicates that antishadowing is dominated by the longitudinal structure function F_L. We also argue that precise measurements of nuclear modifications of R and F_L^A have the potential to constrain the poorly known gluon distribution in nuclei over a wide range of x.

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V. Guzey, L. Zhu, C. Keppel, M. Eric Christy, D. Gaskell, P. Solvignon, A. Accardi. 2012-06-30. Impact of nuclear dependence of R=σ_L/σ_T on antishadowing in nuclear structure functions. https://doi.org/10.1103/physrevc.86.045201

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