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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 5 Issue 1 (1998) pp 77-90
DOI 10.1007/s100529800818
theoretical physics:
Perturbative universality in soft particle production b
Valery A. Khoze (1)(2), Sergio Lupia (3), Wolfgang Ochs (3)
(1) INFN - Laboratori Nazionali di Frascati, P.O. Box 13, I-00044 Frascati, Italy
(2) TH Division CERN, CH-1211 Geneva 23, Switzerland (e-mail: khoze@vxcern.cern.ch)
(3) Max-Planck-Institut für Physik, (Werner-Heisenberg-Institut), Föhringer Ring 6, D-80805 Munich, Germany (e-mail: lupia@mppmu.mpg.de,wwo@mppmu.mpg.de)
Received: 19 November 1997 / Published online: 26 February 1998
Abstract. The spectrum of partons in a QCD jet becomes independent of the primary energy in the low momentum limit. This follows within the perturbative QCD from the colour coherence in soft gluon branching. Remarkably, the hadrons follow such behaviour closely, suggesting the parton hadron duality picture to be appropriate also for the low momentum particles. More generally, this scaling property holds for particles of low transverse and arbitrary longitudinal momentum, which explains an old experimental observation ("fan invariance"). Further tests of the perturbatively based picture for soft particle production are proposed for three-jet events in $e^+e^-$ annihilation and di-jet production events in $\gamma p$, $\gamma\gamma$ and $p\bar p$ collisions. They are based upon the difference in the intensity of the soft radiation from primary $q\bar q$ and $gg$ antennae.
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Online publication: August 4, 1998
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