PROGRAM SUMMARY
Title of program:
GR@PPA_4b (v1.0)
Catalogue identifier:
ADRH
Ref. in CPC:
151(2003)216
Distribution format: tar gzip file
Operating system: UNIX
High speed store required:
56.5K words
Number of lines in distributed program, including test data, etc:
97911
Keywords:
GR@PPA, GRACE, PYTHIA, Higgs, Bottom quark, pp/ppbar collisions,
Elementary particle physics, Event simulation.
Programming language used: Fortran
CPC Program Library subprograms used:
Cat. Id. Title Ref. in CPC ADNN PYTHIA V6.154 135(2001)238
Nature of physical problem:
Four bottom-quark production is an important channel for the study of
Higgs-boson properties at future high energy hadron-collider
experiments. However, the detectability is very ambiguous because only
crude estimates based on many approximations have been available for
background processes.
Method of solution:
GR@PPA_4b calculates the cross section and generates unweighted events
of four bottom-quark production in pp/ppbar collisions, on the basis of
exact matrix elements of all the possible processes at the tree level
within the Standard Model. QCD processes as well as the Higgs boson and
gamma/Z mediated processes are included. The program has been developed
within the framework of GR@PPA, and extension of the GRACE system to
hadron collisions, and embedded in PYTHIA.
CERNLIB libraries are used.
Restrictions:
The Yukawa couplings of lighter quarks (u, d, s and c) are ignored. The
bottom-quark content in the beam hadrons is not taken into account.
Typical running time:
2 hours for a cross-section integration and 200 msec per 1 event for an
event generation.