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题名: BEEC: An event generator for simulating the B-c meson production at an e(+)e(-) collider
作者: Yang, Z ;  Wu, XG ;  Wang, XY
刊名: COMPUTER PHYSICS COMMUNICATIONS
出版日期: 2013
卷号: 184, 期号:12, 页码:2848-2855
关键词: TOP-QUARK DECAYS ;  HADRONIC PRODUCTION ;  HEAVY QUARKONIUM ;  PHYSICS PERFORMANCE ;  UPGRADED VERSION ;  EXCITED-STATES ;  BCVEGPY ;  LHC ;  HADROPRODUCTION ;  UNCERTAINTIES
学科分类: Physics
通讯作者: Wu, XG (reprint author), Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China.
部门归属: [Yang, Zhi; Wu, Xing-Gang] Chongqing Univ, Dept Phys, Chongqing 401331, Peoples R China; [Wang, Xian-You] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Wang, Xian-You] Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China
英文摘要: The B-c meson is a doubly heavy quark-antiquark bound state and carries flavors explicitly, which provides a fruitful laboratory for testing potential models and understanding the weak decay mechanisms for heavy flavors. In view of the prospects in B, physics at the hadronic colliders such as Tevatron and LHC, B-c physics is attracting more and more attention. It has been shown that a high luminosity e(+)e(-) collider running around the Z(0)-peak is also helpful for studying the properties of & meson and has its own advantages. For this purpose, we write down an event generator for simulating B-c meson production through e(+)e(-) annihilation according to relevant publications. We name it BEEC, in which the color-singlet S-wave and P-wave (c (b) over bar)-quarkonium states together with the color-octet S-wave (c (b) over bar)-quarkonium states can be generated. BEEC can also be adopted to generate the similar charmonium and bottomonium states via the semi-exclusive channels e(+)e(-) -> vertical bar Q (Q) over bar)vertical bar n]) + Q + Q with (Q) over bar = b and c respectively. To increase the simulation efficiency, we simplify the amplitude as compact as possible by using the improved trace technology. BEEC is a Fortran program written in a PYTHIA-compatible format and is written in a modular structure, one may apply it to various situations or experimental environments conveniently by using the GNU C compiler make. A method to improve the efficiency of generating unweighted events within PYTHIA environment is proposed. Moreover, BEEC will generate a standard Les Houches Event data file that contains useful information of the meson and its accompanying partons, which can be conveniently imported into PYTHIA to do further hadronization and decay simulation. Program summary Program title: BEEC Catalogue identifier: AEQC_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEQC_v1_0.html Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland Licensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.html No. of lines in distributed program, including test data, etc.: 114868 No. of bytes in distributed program, including test data, etc.: 963939 Distribution format: tar.gz 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. Classification: 11.2. Nature of problem: Production of charmonium, (c (b) over bar)-quarkonium and bottomonium via e(+)e(-) annihilation channel around the Z(0) peak. Solution method: The production of heavy (Q,(Q) over bar')-quarkonium (Q, Q' = b, c) via e(+)e(-) annihilation are estimated by using the improved trace technology. The (QQ')-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, in particular, the unweighted events are generated by using an improved hit-and-miss approach so as to improve the generating efficiency. Restrictions: The generator is aimed at the production of double heavy quarkonium through e(+)e(-) annihilation at the Z(0) peak. The considered processes are those that are associated with two heavy quark jets, which could provide sizable quarkonium events around the Z(0) 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 h on a 2.9 GHz AMD Athlon (tm) II x 4 635 Processor machine to generate 10(5) events; if setting IDPP = 3 (weighted events), it takes only similar to 16 min to generate 10(5) 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. (C) 2013 Elsevier B.V. All rights reserved.
资助者: Fundamental Research Funds for the Central Universities [CDJXS11100002, CQDXWL-2012-Z002]; Natural Science Foundation of China [11075225, 11275280]; Program for New Century Excellent Talents in University [NCET-10-0882]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000328725200025
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15221
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Yang, Z,Wu, XG,Wang, XY. BEEC: An event generator for simulating the B-c meson production at an e(+)e(-) collider[J]. COMPUTER PHYSICS COMMUNICATIONS,2013,184(12):2848-2855.
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