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Public software developed and maintained within the SFB TR9

The projects of the SFB TR9 have also published a number of software packages and programs, which are of interest and open for use by other scientists. Here we provide a list of the available software.

Computer Algebra

Program: ParFORM
Keywords: Computer algebra, parallel computing, MPI
Authors: M. Tentyukov, T. Ueda and J.A.M. Vermaseren
Short description: A parallel version of the symbolic manipulation system FORM based on MPI. It demonstrates a good speedup behaviour on symmetric multiprocessing machines and modern cluster architectures. FORM programs written for the sequential version can run on the ParFORM without any modifications.
(details and download)
Program: TFORM
Keywords: Computer algebra, parallel computing, MPI
Authors: M. Tentyukov and J.A.M. Vermaseren
Short description: A parallel version of the symbolic manipulation system FORM based on Posix threads. FORM programs written for the sequential version can run on the TFORM without any modifications.
(details and download)

Lattice Gauge Theory

Program: UWerrTexp
Keywords: Error analysis, MATLAB, autocorrelations
Authors: F. Virotta
Short description: Error analysis software for Markov chain Monte Carlo data. It is based on the code UWerr of U. Wolff in www.physik.hu-berlin.de/com/ALPHAsoft and implements the proposal presented in dx.doi.org/10.1016/j.nuclphysb.2010.11.020. The main feature is that a tail of the autocorrelation function due to slow modes is estimated.
(details and download)

Continuum Perturbation Theory

Program: RunDec, CRunDec
Keywords: Quantum Chromodynamics, running coupling constant, running quark mass, on-shell mass, MS mass, decoupling of heavy particles
Authors: RunDec: K.G. Chetyrkin, J.H. Kuhn, M. Steinhauser

CRunDec: B. Schmidt, M. Steinhauser

Short description: The values for the coupling constant of Quantum Chromodynamics, αs(nf)(μ), actually depends on the considered energy scale, μ, and the number of active quark flavours, nf. The same applies to light quark masses, mq(nf)(μ), if they are, e.g., evaluated in the MS scheme. In the program RunDec all relevant formulae are collected and various procedures are provided which allow for a convenient evaluation of αs(nf)(μ) and mq(nf)(μ) using the state-of-the-art correction terms.
(details and download)
Program: MATAD
Keywords: Three-loop computations, vacuum integrals, computer algebra, automation of computations
Authors: M. Steinhauser
Short description: Multi-loop integrals are needed for the evaluation of quantum corrections. An important class of loop diagrams is covered by so-called vacuum integrals which have no external momentum. MATAD can analytically compute those one-, two- and three-loop vacuum integrals where one mass scale is present.

The method of integration-by-parts is used in order to obtain recurrence relations which reduce complicated integrals to a small set of so-called master integrals. They have to be evaluated once and for all. In addition a user interface is provided which makes it easy to put in complicated diagrams in a rather compact way.

(details and download)
Program: q2e, exp
Keywords: Asymptotic expansion, large momenta, hard masses, automated calculations
Authors: R. Harlander, T. Seidensticker, M. Steinhauser
Short description: Asymptotic expansions constitute an important tool for the evaluation of Feynman diagrams in particle physics. The combination of the programs q2e and exp perform the asymptotic expansion at the symbolic level in an automated way.

q2e: re-write Qgraf output in FORM notation.

exp: use the output of q2e, apply the asymptotic expansion and generate FORM code for each subdiagram.

(details and download)
Program: TOPIXS
Keywords: Perturbative QCD, top-quark production
Authors: S. Klein, J. Piclum
Short description: TOPIXS computes the inclusive top-quark pair production cross section in hadron collisions at next-to-next-to-leading logarithmic accuracy in soft and Coulomb resummation, including the contribution from bound states.
(details and download)