On the $A$ dependence of $R = σ_L/σ_T$ and the $Q^2$ dependence of Shadowing

Details On the $A$ dependence of $R = σ_L/σ_T$ and the $Q^2$ dependence of Shadowing On the $A$ dependence of $R = σ_L/σ_T$ and the $Q^2$ dependence of Shadowing

1993-09-27

arxiv.org/abs/hep-ph/9309328v1

Phys.Rev.C49:2820-2823,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages + 2 Figures, DOE/ER/40762--019, UMPP \#94--039

Scientific paper

10.1103/PhysRevC.49.2820

A higher--twist nuclear enhancement of $R = \sigma_L/\sigma_T$, as might be expected to arise due to fermi motion and whose magnitude is within the error-bars of recent experiment, is shown to lead to a monotonic {\it decrease} in the ratio of nuclear vs. nucleon cross--sections at small Bjorken $x$ for {\it increasing} $Q^2$. This effect at small $x$, comparable in magnitude to those reported for shadowing, is driven mainly by kinematic factors and essentially vanishes for $x > .1$. Its unusual $Q^2$ dependence rather complicates the unravelling from present data in the shadowing region the corresponding dependence in $Q^2$ of the nuclear structure functions, $F_2^{A}(x,Q^2)$.

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