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

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−Re+e−→e+e−R, where RR is a pseudoscalar resonance, π0π0, ηη, η′η′, ηcηc, or ηbηb. 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 summaryProgram title: GGRESRCCatalogue identifier: AEQB_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEQB_v1_0.htmlProgram obtainable from: CPC Program Library, Queen’s University, Belfast, N. IrelandLicensing provisions: Standard CPC licence, http://cpc.cs.qub.ac.uk/licence/licence.htmlNo. of lines in distributed program, including test data, etc.: 6059No. of bytes in distributed program, including test data, etc.: 61284Distribution format: tar.gzProgramming language: FORTRAN 77.Computer: PC, main frame.Operating system: Linux, Unix.RAM: 512 kbClassification: 11.2, 11.6.External routines: CERN program library (Necessary routines are included in the distribution.)Nature of problem:   Simulation of the e+e−e+e− experiment on measurement of the pseudoscalar meson–photon transition form factors in the single tag modeSolution method:   Events, that are four-momenta of particles, produced in e+e−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−π0e+e−→e+e−π0 with cuts (test run) takes 110 s.References:[1] S. Ong, P. Kessler, Phys. Rev. D 38 (1988) 2280.