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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.
Classification: 11.2.

Nature of problem:
Production of charmonium, (cbbar)-quarkonium and bottomonium via e+e- annihilation channel around the Z0 peak.

Solution method:
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.

Running time:
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.