Two-loop enhancement factor for 1/Q corrections to event shapes in deep inelastic scattering

Abstract

We compute the two-loop enhancement factors for our earlier one-loop calculations of leading (1/Q) power corrections to the mean values of some event shape variables in deep inelastic lepton scattering. The enhancement is found to be equal to the universal ``Milan factor'' for those shape variables considered, provided the one-loop calculation is performed in a particular way. As a result, the phenomenology of power corrections to DIS event shapes remains largely unaffected.

Comments: 15 pages, 1 figure, uses JHEP.cls. This revised version corrects an error in the calculation of the enhancement factor. The main conclusions remain unchanged