EKHARA: A Monte Carlo generator for e+e- → e+e-π0 and e+e- → e+e-π+π- processes

被引：25
|
作者：
Czyz, Henryk [2 ]
Ivashyn, Sergiy [1 ,2 ]
机构：
[1] NSC KIPT, UA-61108 Kharkov, Ukraine
[2] Univ Silesia, Inst Phys, PL-40007 Katowice, Poland
来源：
COMPUTER PHYSICS COMMUNICATIONS | 2011年 / 182卷 / 06期
关键词：
Monte Carlo generator; Pion transition form factor; Pion pair production; Two-photon processes; e(+)e(-) annihilation; RADIATIVE RETURN; 2-PHOTON PHYSICS; NUMBER GENERATOR; KLOE; SIGMA(E(+)E(-);
D O I：
10.1016/j.cpc.2011.01.029
中图分类号：
TP39 [计算机的应用];
学科分类号：
081203 ; 0835 ;
摘要：
We present the EKHARA Monte Carlo event generator of reactions e(+)e(-) -> e(+)e(-)pi(0) and e(+)e(-) -> e(+)e(-)pi(+)pi(-). The newly added channel (e(+)e(-) -> e(+)e(-)pi(0)) is important for gamma*gamma* physics and can be used for the pion transition form factor studies at meson factories.Program summary Program title: EKHARA Catalogue identifier: AEIO_v1_0 Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEIO_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.: 23 820 No. of bytes in distributed program, including test data, etc.: 310 673 Distribution format: tar.gz Programming language: FORTRAN 77 with quadruple precision Computer: PC, main frame Operating system: Linux, Unix, MS Windows RAM: up to 10 Megabytes for operation of the compiled program Classification: 11.2, 11.6 Nature of problem: The first version of EKHARA [1,2] was developed to simulate a background for the pion form factor measurement at meson factories coming from the process e(+)e(-) -> e(+)e(-)pi(+)pi(-). The newly added channel, e(+)e(-) -> e(+)e(-)pi(0), will help in the pion transition form factor studies at meson factories [3]. Solution method: Events consisting of the momenta of the outgoing particles are generated by Monte Carlo methods. The generated events are distributed accordingly to the theoretical cross section. For the e(+)e(-) -> e(+)e(-)pi(0) mode the Monte Carlo sampling developed in [4] was adopted. Restrictions: In order to compile the code, the FORTRAN 77 compiler should support quadruple precision numbers. Unusual features: To avoid numerical cancellations in the e(+)e(-) -> e(+)e(-)pi(+)pi(-) mode calculations are carried in the quadruple precision. Running time: It depends on the requested mode and applied kinematic cuts. An example: on Intel Core2 Quad CPU Q6600 @ 2.40 GHz, using only one thread, 10(5) unweighted e(+)e(-)pi(0) events are generated in 78 seconds (no cuts), 10(5) weighted e(+)e(-)pi(+)pi(-) events are generated in 38 seconds (with cuts [2]). (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：1338 / 1349
页数：12
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