The Monte Carlo program KoralW version 1.51 and the concurrent Monte CarloKoralW&YFSWW3 with all background graphs and first-order corrections to W-pair production
S. Jadacha et al., The Monte Carlo program KoralW version 1.51 and the concurrent Monte CarloKoralW&YFSWW3 with all background graphs and first-order corrections to W-pair production, COMP PHYS C, 140(3), 2001, pp. 475-512
The version 1.51 of the Monte Carlo (MC) program KoralW for all e(+)e(-) --
> f(1)f(2)f(3)f(4) processes is presented. The most important change from t
he previous version 1.42 is the facility for writing MC events on the mass
storage device and reprocessing them later on. In the reprocessing paramete
rs of the Standard Model may be modified in order to fit them to experiment
al data. Another important new feature is the possibility of including comp
lete O(a) corrections to double-resonant W-pair component-processes in addi
tion to all background (non-WW) graphs. The inclusion is done with the help
of the YFSWW3 MC event generator for fully exclusive differential distribu
tions (event per event). Technically, it is done in such a way that YFSWW3
runs concurrently with Kora1W as a separate slave process, reading momenta
of the MC event generated by KoralW and returning the correction weight to
KoralW. The latter introduces the O(alpha) correction using this weight, an
d finishes processing the event (rejection due to total MC weight, hadroniz
ation, etc.). The communication between KoralW and YFSWW3 is done with the
help of the FIFO facility of the UNIX/Linux operating system. This does not
require any modifications of the FORTRAN source codes. From the user's poi
nt of view, the resulting Concurrent MC event generator KoralW&YFSWW3 looks
as a regular single MC event generator with all the standard features. (C)
2001 Elsevier Science B.V All rights reserved.