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Manuscript Title: GR@PPA_4b: a four bottom quark production event generator for pp/ppbar collisions.
Authors: S. Tsuno, K. Sato, T. Abe, J. Fujimoto, T. Ishikawa, Y. Kurihara, S. Odaka, Y. Takaiwa
Program title: GR@PPA_4b (v1.0)
Catalogue identifier: ADRH_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 151(2003)216
Programming language: Fortran.
Operating system: UNIX.
RAM: 56.5K words
Keywords: GR@PPA, GRACE, PYTHIA, Higgs, Bottom quark, pp/ppbar collisions, Elementary particle physics, Event simulation.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ACTU_v2_0 PYTHIA V6.154 CPC 135(2001)238

Nature of 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.

Solution method:
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.

Running time:
2 hours for a cross-section integration and 200 msec per 1 event for an event generation.