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

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.

9 pages, 8 figures, 1 table

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• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Nuclear corrections in neutrino-nucleus DIS and their compatibility with global NPDF analyses
• Nuclear PDFs from neutrino deep inelastic scattering
• Longitudinal-Transverse Separations of Structure Functions at Low $Q^2$ for Hydrogen and Deuterium
• Nuclear physics with a medium-energy Electron-Ion Collider

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• Nuclear medium effects in structure functions of nucleon at moderate $Q^2$
• Measurement of D${}^{+}$ meson production in p-Pb collisions with the ALICE detector
• Extraction of the neutron F2 structure function from inclusive proton and deuteron deep-inelastic scattering data
• Examining the EMC Effect using the $F_2^n$ neutron structure function
• Recent Developments in Neutrino/Antineutrino - Nucleus Interactions