Small -x behavior of the non-singlet and singlet structure functions g1
Abstract
Explicit expressions for the non-singlet 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 both the non-singlet and singlet g1 asymptotically ~ x- , with the singlet intercept = 0.86 and being more than twice larger than the non-singlet intercept = 0.4. The impact of the initial quark and gluon densities on the sign of g1 at x << 1 is discussed.
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