Elsevier Science Home
Computer Physics Communications Program Library
Full text online from Science Direct
Programs in Physics & Physical Chemistry
CPC Home

[Licence| Download | New Version Template] aadq_v1_0.gz(3 Kbytes)
Manuscript Title: Programs to calculate multiple QED radiation in leptonic decays of the Z0 and W+- weak bosons.
Authors: S. Laporta, R. Odorico
Program title: ZORAD
Catalogue identifier: AADQ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 39(1986)127
Programming language: Fortran.
Computer: VAX 780.
Operating system: VMS 3.7, NOS/BE 1.5.
Word size: 32
Keywords: Particle physics, Elementary, Weak bosons, Quantum electrodynamics, Leptonic decays, Bremsstrahlung, Multiple Photon radiation.
Classification: 11.4.

Nature of problem:
Charged leptons from decays of the Z0 and W+- weak bosons are affected by substantial QED radiation effects. Relevant quantities, like energy losses undergone by the charged leptons, heavily depend on radiation of soft and collinear photons, which is inadequately treated by the O(alpha) approximation in the problem at hand. An inclusion of multiple photon emissions becomes necessary.

Solution method:
The Weiszacker-Williams approximation is employed to correct the 0(Alpha) approximation so as to include higher order contributions in emission of soft and collinear photons.

Running time:
For ZORAD applied to electron + positron + photons decays of Z0, 312 decay events per CPU second on VAX-780/VMS; for WRAD applied to electron + neutrino + photons decays of W+-, 500 decay events per CPU second on VAX-780/VMS.