Polarised deep inelastic scattering accompanied by a forward jet as a probe of the ln(2)(1/x) resummation

We argue that the production of forward jets in polarised deep inelastic sc attering can be a useful tool for probing the double ln(2)(1/x) resummation effects which control the polarised deep inelastic scattering for small va lues of the Bjorken parameter x. We solve the corresponding integral equati ons generating the double ln(2)(1/x) resummation and calculate the differen tial structure function describing the forward jet production in the small x regime which can possibly be probed by the polarised HERA measurements. W e show that these structure functions should exhibit the characteristic inc rease with decreasing x/x(J), where x(J) denotes the longitudinal momentum fraction of the parent proton carried by a jet, and we quantify this increa se. (C) 1999 Published by Elsevier Science B.V. All rights reserved.