Heavy-quark contributions to the ratio FL/F2 at low x

We study the heavy-quark contribution to the proton structure functions F2i(x,Q2) and FLi(x,Q2), with i=c,b, for small values of Bjorken's x variable at next-to-lading order and provide compact formulas for their ratios Ri=FLi/F2i that are useful to extract F2i(x,Q2) from measurements of the do...

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Bibliographic Details
Published in:Physics letters. B 2008-05, Vol.663 (1-2), p.66-72
Main Authors: Illarionov, Alexey Yu, Kniehl, Bernd A., Kotikov, Anatoly V.
Format: Article
Language:English
Subjects:
Deep-inelastic scattering
Differential cross sections
Exact sciences and technology
Nuclear physics
Physics
Quantum chromodynamics
Structure functions
The physics of elementary particles and fields
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Summary:We study the heavy-quark contribution to the proton structure functions F2i(x,Q2) and FLi(x,Q2), with i=c,b, for small values of Bjorken's x variable at next-to-lading order and provide compact formulas for their ratios Ri=FLi/F2i that are useful to extract F2i(x,Q2) from measurements of the doubly differential cross section of inclusive deep-inelastic scattering at DESY HERA. Our approach naturally explains why Ri is approximately independent of x and the details of the parton distributions in the low-x regime.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2008.02.068