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

15th International Workshop on Advanced Computing and Analysis Techniques in Physics Research

物理学;计算机科学

Wu, Xing-Gang^1

Department of Physics, Chongqing University, Chongqing 401331, China^1

关键词: Feynman diagrams;    Fusion mechanism;    Hadronization;    High efficient;    Numerical efficiency;    Recent progress;    Scattering amplitudes;    Simulation environment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/523/1/012042/pdf
DOI  :  10.1088/1742-6596/523/1/012042

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

Doubly heavy mesons and baryons provide a good platform for testing pQCD. Two high efficient 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, which have already been adopted by several collaborations as LHCb, CMS and etc. to do Bcand Ξcc simulations.