Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-04
Phys.Rev.D71:054001,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
42 pages, 18 figures, 1 table, RevTex. The final version published in PRD 71, 054001 (2005)
Scientific paper
10.1103/PhysRevD.71.054001
Using the leading twist approach to nuclear shadowing, which is based on the relationship between nuclear shadowing and diffraction on a nucleon, we calculate next-to-leading order nuclear parton distribution functions (nPDFs) and structure functions in the region $0.2 > x > 10^{-5}$ and $Q^2 \geq 4$ GeV$^2$. The uncertainties of our predictions due the uncertainties of the experimental input and the theory are quantified. We determine the relative role of the small ($\sim Q^2$) and large ($\gg Q^2$) diffractive masses in nuclear shadowing as a function of $x$ and find that the large mass contribution, which is an analog of the triple Pomeron exchange, becomes significant only for $x \le 10^{-4}$. Comparing our predictions to the available fixed-target nuclear DIS data, we argue, based on the current experimental studies of the leading twist diffraction, that the data at moderately small $x\sim 0.01$ and $Q^2 \sim 2$ GeV$^2$ could contain significant higher twist effects hindering the extraction of nPDFs from that data. Also, we find that the next-to-leading order effects in nuclear shadowing in the ratio of the nucleus to nucleon structure functions $F_2$ are quite sizable. Within the same formalism, we also present results for the impact parameter dependence of nPDFs. We also address the problem of extracting of the neutron $F_{2n}(x,Q^2)$ from the deuteron and proton data. We suggest a simple and nearly model-independent procedure of correcting for nuclear shadowing effects using $F_2^A/F_2^D$ ratios.
Frankfurt Leonid L.
Guzey Vadim
Strikman Mark
No associations
LandOfFree
Leading twist nuclear shadowing: uncertainties, comparison to experiments and higher twist effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Leading twist nuclear shadowing: uncertainties, comparison to experiments and higher twist effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Leading twist nuclear shadowing: uncertainties, comparison to experiments and higher twist effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-478936