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Manuscript Title: CalcHEP 3.4 for collider physics within and beyond the Standard Model
Authors: Alexander Belyaev, Neil D. Christensen, Alexander Pukhov
Program title: CalcHEP
Catalogue identifier: AEOV_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 184(2013)1729
Programming language: C.
Computer: PC, MAC, Unix Workstations.
Operating system: Unix.
RAM: Depends on process under study
Keywords: Matrix element generator, Event generator, Feynman diagram calculator.
Classification: 4.4, 5.

External routines: X11

Nature of problem:
  1. Implement new models of particle interactions.
  2. Generate Feynman diagrams for a physical process in any implemented theoretical model.
  3. Integrate phase space for Feynman diagrams to obtain cross sections or particle widths taking into account kinematical cuts.
  4. Simulate collisions at modern colliders and generate respective unweighted events.
  5. Mix events for different subprocesses and connect them with the decays of unstable particles.

Solution method:
  1. Symbolic calculations.
  2. Squared Feynman diagram approach
  3. Vegas Monte Carlo algorithm.

Up to 2 → 4 production (1 → 5 decay) processes are realistic on typical computers. Higher multiplicities sometimes possible for specific 2 → 5 and 2 → 6 processes.

Unusual features:
Graphical user interface, symbolic algebra calculation of squared matrix element, parallelization on a pbs cluster.

Running time:
Depends strongly on the process. For a typical 2 → 2 process it takes seconds. For 2 → 3 processes the typical running time is of the order of minutes. For higher multiplicities it could take much longer.