Does Efficiency of High Energy Collisions Depend on a Hard Scale?
  The multiplicity of charged hadrons in the current fragmentation region of both the c.m.s. and the Breit frame of deep inelastic scattering is calculated and compared with the HERA data. The results are in agreeement with Yang's hypothesis that the efficiency of high energy processes increases at larger momentum transfer. 
A.V. Kisselev and V.A. Petrov (IHEP, Protvino)