Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-05-24
Prog.Theor.Phys. 107 (2002) 1163
Physics
High Energy Physics
High Energy Physics - Phenomenology
33 pages, PTPTeX.sty, 16 Postscript eps figures; To be published in Progress of Theoretical Physics
Scientific paper
10.1143/PTP.107.1163
Three-body decay functions in time-like parton branching are calculated using the jet calculus to the next-to-leading logarithmic (NLL) order in perturbative quantum chromodynamics (QCD). The phase space contributions from each of the ladder diagrams and interference diagrams are presented. We correct part of the results for the three-body decay functions calculated previously by two groups. Employing our new results, the properties of the three-body decay functions in the regions of soft partons are examined numerically. Furthermore, we examine the contribution of the three-body decay functions modified by the restriction resulting from the kinematical boundary of the phase space for two-body decay in the parton shower model. This restriction leads to some problems for the parton shower model. For this reason, we propose a new restriction introduced by the kinematical boundary of the phase space for two-body decay.
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