GR@PPA_4b: A Four Bottom Quark Production Event Generator for PP/PPbar Collisions

Abstract

We have developed an event generator, named GR@PPA_4b, for the four bottom quark (b bbar b bbar) production processes at PP and PPbar collisions. The program implements all of the possible processes at the tree level within the framework of the Standard Model. Users can generate events from the Higgs boson and photon/Z mediated processes, as well as those from pure QCD interactions. The integration and the event generation are performed within the newly developed GR@PPA framework, an extension of the GRACE automatic event-generator generation system to hadron collisions. This program is so designed that it can be embedded in a general-purpose event generator PYTHIA version 6.1. PYTHIA adds the initial- and final-state parton showers and simulates the hadronization and decays to make generated events realistic. It should be emphasized that a huge number of diagrams and complicated four-body kinematics are dealt with strictly in GR@PPA_4b. This program will be useful for studies of Higgs boson productions, especially those in extended models where the Yukawa coupling to b quarks is greatly enhanced. The source code is located in http://atlas.kek.jp/physics/nlo-wg/index.html .

31 pages, 7 figures

References in corpus (2)

• GRAPE-Dilepton (version1.1), A Generator for Dilepton Production in ep Collisions
• Integration of GRACE and PYTHIA

Cited by in corpus (13)

• ALPGEN, a generator for hard multiparton processes in hadronic collisions
• MadEvent: Automatic Event Generation with MadGraph
• PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders
• GR@PPA 2.7 event generator for $pp$/$p\bar{p}$ collisions
• GR@PPA 2.8: initial-state jet matching for weak boson production processes at hadron collisions
• PHASE, a Monte Carlo event generator for six-fermion physics at the LHC
• Boson Fusion and Higgs production at the LHC in six fermion final states with one charged lepton pair
• Search for Anomalous Couplings in Top Decay at Hadron Colliders
• Method 2 at NLO
• Consistent simulation of direct-photon production in hadron collisions including associated two-jet production
• ME-PS matching in the simulation of multi-jet production in hadron collisions using a subtraction method
• Precise simulation of the initial-state QCD activity associated with $Z$-boson production in hadron collisions
• The inclusion of higher-order QCD corrections into Parton Shower Monte Carlos