Anomalous dimensions of high-twist operators in QCD at N → 1 and large Q2

E. Laenen, E. Levin, A. G. Shuvaev

Research output: Contribution to journalArticlepeer-review

Abstract

The anomalous dimensions of high-twist operators in deeply inelastic scattering (γ2n) are calculated in the limit when the moment variable N → 1 (or xB → 0) and at large Q2 (the double logarithmic approximation) in perturbative QCD. We find that the value of γ2n × (N - 1) in this approximation behaves as [NcαS/π(N - 1)]n2 [1 + 1 3δ(n2 - 1)] where δ ≈ -2. This implies that the contributions of the high-twist operators give rise to an earlier onset of shadowing than was estimated before. The derivation makes use of a Pomeron exchange approximation, with the Pomerons interacting attractively. We find that they behave as a system of fermions.

Original languageEnglish
Pages (from-to)39-58
Number of pages20
JournalNuclear Physics, Section B
Volume419
Issue number1
DOIs
StatePublished - 9 May 1994
Externally publishedYes

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