EERAD3: Event shapes and jet rates in electron–positron annihilation at order [formula omitted

Abstract

The program EERAD3 computes the parton-level QCD contributions to event shapes and jet rates in electron–positron annihilation to order αs3. For three-jet production and related observables, this corresponds to next-to-next-to-leading order corrections, and allows for precision QCD studies. We describe the program and its usage in detail. Program summaryProgram title: EERAD3Catalogue identifier: AEUC_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AEUC_v1_0.htmlProgram obtainable from: CPC Program Library, Queen’s University, Belfast, N. IrelandLicensing provisions: GNU General Public License, version 3No. of lines in distributed program, including test data, etc.: 119253No. of bytes in distributed program, including test data, etc.: 1368922Distribution format: tar.gzProgramming language: FORTRAN77 (with some FORTRAN90 features).Computer: All.Operating system: All.Has the code been vectorised or parallelised?: Program code allows the storage and adaptation of Monte Carlo information for producing statistically independent results on many cores. A tool for the combination of these is provided with the code.RAM: 6 MBytesClassification: 11.2, 11.5.Nature of problem:Computation of second-order QCD corrections to event shapes and jet cross sections in electron–positron annihilation.Solution method:Generation of events at parton-level, supplemented by a subtraction method to combine infrared singular contributions among different partonic channels.Running time:The high-precision/high-resolution distributions in [1] required about 700 CPU-days on an Intel Q6800 2.9 GHz. Reasonable precision can be obtained with run times of about 100 hours per coefficient for distributions, or within 5 hours if only single moments are computed.