GGRESRC: A Monte Carlo generator for the two-photon process e+e−→e+e−R(JPC=0−+) in the single-tag mode

• Published in: Computer physics communications Vol. 185; no. 1; pp. 236 - 243
• Main Authors: Druzhinin, V.P., Kardapoltsev, L.V., Tayursky, V.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2014
• Subjects: [formula omitted] annihilation; Meson–photon transition form factor; Monte Carlo generator; Two-photon process; Meson–photon transition form factor; e+e− annihilation; Monte Carlo generator; Two-photon process
• ISSN: 0010-4655; 1879-2944
• DOI: 10.1016/j.cpc.2013.07.017

The Monte Carlo event generator GGRESRC is described. The generator is developed for the simulation of events of the two-photon process e+e−→e+e−R, where R is a pseudoscalar resonance, π0, η, η′, ηc, or ηb. The program is optimized for the generation of two-photon events in the single-tag mode. For single-tag events, radiative correction simulation is implemented in the generator including photon emission from the initial and final states. Program title: GGRESRC Catalogue identifier: AEQB_v1_0 Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEQB_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.: 6059 No. of bytes in distributed program, including test data, etc.: 61284 Distribution format: tar.gz Programming language: FORTRAN 77. Computer: PC, main frame. Operating system: Linux, Unix. RAM: 512 kb Classification: 11.2, 11.6. External routines: CERN program library (Necessary routines are included in the distribution.) Nature of problem: Simulation of the e+e− experiment on measurement of the pseudoscalar meson–photon transition form factors in the single tag mode Solution method: Events, that are four-momenta of particles, produced in e+e− collision according to the theoretical cross section, are generated by Monte Carlo method. Additional comments: The theoretical uncertainty of the formulas used is estimated to be about 1% [1] Running time: On Intel Pentium CPU @ 3.4 GHz simulation of 106 events e+e−→e+e−π0 with cuts (test run) takes 110 s. References: [1] S. Ong, P. Kessler, Phys. Rev. D 38 (1988) 2280.