Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] adtj_v2_0.tar.gz(1110 Kbytes)|
|Manuscript Title: BCVEGPY2.0: An upgraded version of the generator BCVEGPY with the addition of hadroproduction of the P-wave Bc states|
|Authors: Chao-Hsi Chang, Jian-Xiong Wang, Xing-Gang Wu|
|Program title: BCVEGPY|
|Catalogue identifier: ADTJ_v2_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 174(2006)241|
|Programming language: FORTRAN 77/90.|
|Computer: Any computer with FORTRAN 77 or 90 compiler. The program has been tested on HP-SC45 Sigma-X parallel computer, Linux PCs and Windows PCs with Visual Fortran.|
|Operating system: UNIX, Linux and Windows.|
|RAM: About 2.0 MB|
|Keywords: Event generator, hadronic production, Bc meson, S-wave and P-wave states.|
|PACS: 13.85.Ni, 12.38.Bx, 14.40.Nd, 14.40.Lb.|
Nature of problem:
Hadronic production of Bc meson itself and its excited states.
The code with option can generate weighted and un-weighted events. For jet hadronization, an interface to PYTHIA is provided.
Reasons for new version:
There are two reasons. One is to provide additional codes for the hadronic production of P-wave excited Bc states; the four via color-singlet P-wave state directly and the two via color-octet S-wave state accordingly. The other one is to decompose the color-flow factor for the amplitude by an approximate way, that is adopted in PYTHIA.
Summary of revisions:
The hadronic production of (cbbar)-quarkonium in S-wave and P-wave states via the mechanism of gluon-gluon fusion are given by the 'complete calculation' approach of the leading order QCD. The contributions from the other mechanisms for P-wave production which are small comparatively are not included.
Generally speaking, it depends on which option is used to drive PYTHIA when generating the Bc events. Typically, for the hadronic production of the S-wave (cbbar)-quarkonium, if the PYTHIA parameter IDWTUP= 1, then it takes about 20 hours on a 1.8 GHz Intel P4-processor machine to generate 1000 events; however if IDWTUP= 3, to generate 106 events, it takes only about 40 minutes. For the hadronic production of the P-wave (cbbar)-quarkonium, the necessary time will be almost two times longer than the S-wave quarkonium production.
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