Jet Shapes in ep and pp Collisions in NLO QCD

We have calculated jet shapes in low Q2 ep and pp collisions in perturbation theory at order αs for the hard parton-parton processes. For the γp process resolved and direct contributions are superimposed. The dependence of the jet shapes on transverse energy, rapidity, and inner cone extension is studied. The numerical results of the calculation are compared with recent data from ZEUS at HERA and from CDF and D0 at the TEVATRON. Good agreement is achieved if the problem of merging overlapping jets is taken into account by varying the parameter Rsep as a function of transverse energy and rapidity. ∗Supported by Bundesministerium für Bildung und Wissenschaft, Forschung und Technologie, Bonn, Germany under Contract 05 7HH92P(0) and EU Program ”Human Capital and Mobility” through Network ”Physics at High Energy Colliders” under Contract CHRX-CT93-0357 (DG12 COMA)