Photon impact factor and $k_T$-factorization for DIS in the next-to-leading order

Abstract

The photon impact factor for the BFKL pomeron is calculated in the next-to-leading order (NLO) approximation using the operator expansion in Wilson lines. The result is represented as a NLO $k_T$-factorization formula for the structure functions of small-$x$ deep inelastic scattering.

Comments: 13 pages, 4 figures, typos corrected. arXiv admin note: substantial text overlap with arXiv:1009.4729