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Manuscript Title: An Upgraded Version of the Generator BCVEGPY2.0 for Hadronic Production of Bc Meson and Its Excited States
Authors: Chao-Hsi Chang, Jian-Xiong Wang, Xing-Gang Wu
Program title: BCVEGPY2.1
Catalogue identifier: ADTJ_v2_1
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 175(2006)624
Programming language: FORTRAN 77/90.
Computer: Any Linux based on PC with FORTRAN 77 or FORTRAN 90 and GNU C compiler as well.
Operating system: Linux.
RAM: About 2.0 MB
Supplementary material: A pdf file containing a summary of the changes made in this version of the program is available.
Keywords: Event generator, Hadronic production, Bc meson.
PACS: 13.40.Gp, 12.38.Bx, 12.39.Ki.
Classification: 11.2, 11.5.

Does the new version supersede the previous version?: No

Nature of problem:
Hadronic production of Bc meson itself and its excited states.

Solution method:
The code with option can generate weighted and un-weighted events. An interface to PYTHIA is provided to meet the needs of jets hadronization in the production.

Reasons for new version:
Responding to the feedback from users, we rearranged the program in a convenient way so that it can be easily adopted by the users to do the simulations according to their own experimental environment (e.g. detector acceptances and experimental cuts). We have made many efforts to rearrange the program into several modules with less cross communication among the modules, the main program is slimmed down and all the further actions are decoupled from the main program and can be easily called for various purposes.

Summary of revisions:
see Supplementary material.

The hadronic production of (cbbar)-quarkonium in S-wave and P-wave states via the mechanism of gluon-gluon fusion are given by the so-called `complete calculation' approach.

Running time:
The typical running time is machine and user-parameters dependent. Typically, for production of the S-wave (cbbar)-quarkonium, when IDWTUP=1, it takes about 20 hour on a 1.8 GHz Intel P4-processor machine to generate 1000 events; however, when IDWTUP=3, to generate 106 events it takes about 40 minutes only. Of the production, the time for the P-wave (cbbar)-quarkonium will take almost two times longer than that for its S-wave quarkonium.

[1] Chao-Hsi Chang, Chafik Driouich, Paula Eerola and Xing-GangWu, Comput. Phys. Commun. 159, 192 (2004); hep-ph/0309120.
[2] Chao-Hsi Chang, Jian-Xiong Wang and Xing-Gang Wu, Comput. Phys. Commun. 174, 241 (2006); hep-ph/0504017.
[3] T. Sjostrand, Comput. Phys. Commun. 82, 74 (1994).
[4] G.P. Lepage, J. Comp. Phys 27, 192 (1978).
[5] Chao-Hsi Chang, Cong-Feng Qiao, Jian-Xiong Wang and Xing-Gang Wu, Phys. Rev. D71, 074012(2005).
[6] H.L. Lai, et al., hep-ph/0201195; JHEP 0207, 012 (2002).
[7] T. Hahn and M. Rauch, hep-ph/0601248(2006).
[8] private communication with Paula Eerola and Chafik Driouichi.
[9] private communication with A.A. Belkov, G.M. Chen, S. Shulga and S.H. Zhang; S.H. Zhang, A.A. Belkov, S. Shulga and Guo-Ming Chen, Chin. Phys. Lett. 21, 2380(2004).
[10] private communication with Y.N. Gao, J.B. He, P. Robbe and Z.W. Yang.