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Manuscript Title: CAMORRA: a C++ library for recursive computation of particle scattering amplitudes
Authors: R. Kleiss, G. van den Oord
Program title: CAMORRA
Catalogue identifier: AEHN_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 182(2011)435
Programming language: C++.
Computer: All.
Operating system: Tested on Linux and Mac OS, but should work on any system.
Keywords: template library, Les-Houches interface.
Classification: 4.4.

Nature of problem:
Current recursive matrix element computation programs are confined to standard model amplitudes, whereas many new physics signatures and backgrounds at hadron colliders are associated with multi-parton final states.

Solution method:
The library applies the Berends-Giele/Caravaglios-Moretti recursive algorithm in a generic way applicable to a wide range of quantum field theories. It allows the user to define a new physics model and consequently compute its predicted scattering amplitudes with exponential growth of the computing time with process multiplicity rather than factorial growth.

Restrictions:
There are no built-in restrictions on process complexity.

Unusual features:
CAMORRA can cope with Majorana fermions

Running time:
A ten-gluon amplitude typically takes 9 ms per event.