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Programs in Physics & Physical Chemistry



Manuscript Title: SANCnews: Sector ffbb
Authors: D. Bardin, S. Bondarenko, L. Kalinovskaya, G. Nanava, L. Rumyantsev, W. von Schlippe
Program title: SANC
Catalogue identifier: ADXK_v1_1 Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 177(2007)738
Programming language: Java, FORM3, PERL, FORTRAN.
Computer: Intel-based PCs on which Java and FORM3 are available.
Operating system: Linux, Windows.
RAM: 10 MB
Word size: 32
Keywords: Feynman diagrams, Perturbation theory, Quantum field theory, Standard Model, Electroweak interactions, QCD, QED, One-loop calculations, Monte Carlo generators.
PACS: 11.10.Gh, 11.15.Kc, 11.80.Cr..
Classification: 11.6.
Does the new version supersede the previous version?: Yes
Nature of problem: Automatic calculation of pseudo- and realistic observables for various processes and decays in the Standard Model of Electroweak interactions, QCD and QED at one-loop precision level. Form factors and helicity amplitudes free of UV divergences are produced. For exclusion of IR singularities the soft photon emission is included.
Solution method: Numerical computation of analytical formulae of form factors and helicity amplitudes. For simulation of two fermion radiative decays of Standard Model bosons (W^±, Z) and the Higgs boson a Monte Carlo technique is used.
Reasons for new version: Implementation of new processes; extension of an automatic generation of FORTRAN codes by the s2n.f package onto many more processes; bug fixes.
Summary of revisions: implementation of light-by-light scattering into QED branch vast update of 2f2b node in EW branch complete renovation of QCD branch
Restrictions: In the current version of SANC there are 3 and 4 particle processes and decays available at one-loop precision level.
Running time: The running time depends on the selected process. For instance, the symbolic calculation of form factors (with precomputed building blocks) for H → e⁺e-Z process takes about 10 sec, helicity amplitudes - about 10 sec, and bremsstrahlung - 1 min 10 sec. The relevant s2n runs take about 2 min 40 sec, 1 sec and 30 sec respectively. The numerical computation of decay rate for this process (production of benchmark case 3 Table) takes about 5 sec (CPU 3GHz IP4, RAM 512Mb, L2 1024 KB).