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SMALL-x BEHAVIOUR OF THE NONSINGLET
AND SINGLET STRUCTURE FUNCTIONS g1
Ermolaev B. I., Greco M., Troyan S. I.
Explicit expressions for the nonsinglet and singlet
structure functions g1 at the small-x region
are obtained. They include the total resummation of double-logarithmic
contributions and accounting for the running QCD coupling effects. We
predict that asymptotically the singlet g1 ~ x-DS,
with the intercept DS = 0.86,
which is approximately twice larger than the nonsinglet intercept DNS
= 0.4. The impact of the initial quark and gluon densities on the sign
of g1 at x<<1 is discussed.
PDF (201 Kb)
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