The color dipole BFKL-Regge expansion: from DIS on protons to pions to rise of hadronic cross sections

As noticed by Fadin, Kuraev and Lipatov in 1975 incorporation of asymptotic freedom into the BFKL equation splits the QCD pomeron into a series of iso lated poles in complex angular momentum plane. Following our earlier work o n the proton structure function we explore the phenomenological consequence s of the emerging BFKL-Regge factorized expansion for the small-x structure function of the pion F-2 pi(x,Q(2)). We calculate F-2 pi in a small-x regi on and find good agreement with the recent H1 determination of F-2 pi(x,Q(2 )). We also present the BFKL-Regge factorization based evaluation of the co ntribution from hard scattering to the observed rise of the NN, pi N and re al photo-absorption gamma N and gamma pi total cross sections. (C) 2000 Pub lished by Elsevier Science B.V. All rights reserved.