BCVEGPY and GENXICC for the hadronic production of the doubly heavy mesons and baryons

TL;DR

This paper discusses the development and recent improvements of two generators, BCVEGPY and GENXICC, which simulate the hadronic production of doubly heavy mesons and baryons, crucial for testing perturbative QCD.

Contribution

The paper introduces updated versions of BCVEGPY and GENXICC with enhanced efficiency and compatibility for simulating doubly heavy hadron production in high-energy physics.

Findings

Improved numerical efficiency in event generation

Enhanced compatibility with PYTHIA for hadronization

Effective simulation of gluon-gluon fusion mechanisms

Abstract

Doubly heavy mesons and baryons provide a good platform for testing pQCD. Two generators BCVEGPY and GENXICC for simulating the hadronic production of the doubly heavy mesons and baryons have been developed in recent years. In this talk, we present their main idea and their recent progresses. The dominant gluon-gluon fusion mechanism programmed in those two generators are written based on the improved helicity amplitude approach, in which the hard scattering amplitude are dealt with directly at the amplitude level and the numerical efficiency are greatly improved by properly decomposing the Feynman diagrams and by fully applying the symmetries among them. Moreover, in comparison to the previous versions, we have updated the programs in order to generate the unweighted meson or baryon events much more effectively within various simulation environments. The generators can be conveniently imported into PYTHIA to do further hadronization and decay simulation.