== HELAS library ==

We are currently using v3.1. With respect to v3.0 a small set of modifications has been made,
including adding new subroutines to deal with models with higher spin particles.

=== Documentation ===
   
   * [attachment:helas.pdf helas.pdf]: The original HELAS manual, KEK preprint 1992

   * [attachment:HELAS_HEFT.pdf HELAS_HEFT.pdf]: Description of the new HELAS subroutines for HEFT, by Rikkert Frederix, 30 May 2006.

   * [attachment:HELAS_diffs.txt HELAS_diffs.txt]: List of differences between v3.0 and v3.1, by Rikkert Frederix, 2 Jul 2007.

   * [http://www.slac.stanford.edu/spires/find/hep/www?eprint=arXiv:0805.2554 Link]: New subroutines for spin-2 particles, by Hagiwara et al., May 2008.