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

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