Programs in Physics & Physical Chemistry
|[Licence| Download | New Version Template] aeqc_v1_0.tar.gz(941 Kbytes)|
|Manuscript Title: BEEC: An event generator for simulating the Bc meson production at an e+e- collider|
|Authors: Zhi Yang, Xing-Gang Wu, Xian-You Wang|
|Program title: BEEC|
|Catalogue identifier: AEQC_v1_0|
Distribution format: tar.gz
|Journal reference: Comput. Phys. Commun. 184(2013)2850|
|Programming language: FORTRAN 77/90.|
|Computer: Any computer with Fortran compiler, the program is tested with GNU Fortran compiler and Intel Fortran compiler.|
|Operating system: UNIX, Linux and Windows.|
|RAM: About 2.0 MB.|
|Keywords: BEEC, Bc meson, PYTHIA, e+e- collider.|
|PACS: 12.38.Bx, 14.40.Pq, 12.39.Jh.|
Nature of problem:
Production of charmonium, (cbbar)-quarkonium and bottomonium via e+e- annihilation channel around the Z0 peak.
The production of heavy (QQbar′)-quarkonium (Q,Q′ = b, c) via e+e- annihilation are estimated by using the improved trace technology. The (QQbar′)-quarkonium in color-singlet 1S-wave state, 1P-wave state, and the color-octet 1S-wave states have been studied within the framework of non-relativistic QCD. The code with option can generate weighted and unweighted events conveniently, especially, the unweighted events are generated by using an improved hit-and-miss approach so as to improve the generating efficiency.
The generator is aimed at the production of double heavy quarkonium through e+e- annihilation at the Z0 peak. The considered processes are those that are associated with two heavy quark jets, which could provide sizable quarkonium events around the Z0 peak.
It depends on which option one chooses to match PYTHIA when generating the heavy quarkonium events. Typically, for the production of the S-wave quarkonium states, if setting IDPP=2 (unweighted events), then it takes about 2 hours on a 2.9 GHz AMD Athlon (tm) II×4 635 Processor machine to generate 105 events; if setting IDPP=3 (weighted events), it takes only ~ 16 minutes to generate 105 events. For the production of the P-wave quarkonium states, the time will be almost one hundred times longer than the case of the S-wave quarkonium.
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