Angular distribution of particle flows and perturbative QCD predictionsM.A. Buican1, V.A. Khoze2 and W. Ochs1
1 Max-Planck-Institut für Physik, (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München, Germany
2 Department of Physics and Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
(Received: 16 December 2002 / Revised version: 12 February 2003 / Published online: 24 March 2003)
We discuss the predictions of perturbative QCD for angular flows of final state particles in two and three jet events including their cms energy and jet resolution ( ycut) dependence. The simple analytical formulae for gluon bremsstrahlung from primary partons, modified for gluon cascading, reproduce the main features of the experimental data well. For ycut-selected events, the particle flow is derived from a superposition of colour dipoles in much the same way that photon radiation is derived from electric dipoles.
© Società Italiana di Fisica, Springer-Verlag 2003