GR@PPA Event Generator

TL;DR

The paper reviews the development and current status of the GR@PPA event generator, highlighting its evolution from 2000 to the latest release supporting weak-boson production with jet matching, aiming for NLO event generation.

Contribution

It introduces GR@PPA 2.8, supporting weak-boson production with initial-state jet matching, marking progress towards NLO event generators.

Findings

Supports single and double weak-boson production processes

Includes initial-state jet matching

Progresses towards NLO event generator development

Abstract

The history and the present status of the GR@PPA event generator are briefly reviewed. The development of GR@PPA started in 2000 in order to provide a framework of NLO event generators for hadron collision interactions. After the first release of the package (GR@PPA\_4b) in 2002, which supported four bottom quark production processes, many multi-particle production processes have been added to the package: GR@PPA\_ALL in 2004 and GR@PPA 2.7 in 2006. Now we are going to release a new package (GR@PPA 2.8), which supports single and double weak-boson production processes with an initial-state jet matching. Though the matrix elements presently included are still at the tree level, this new release is an important step towards constructing consistent NLO event generators.