






Helac-Phegas
For the phase space generation the PHEGAS program is used which has been the first implementation of a complete automated algorithm of multi-channel phase-space mappings for arbitrary number of external particles. It also uses a self-adaptation procedure that reshapes the generated phase-space density, including also the PARNI algorithm for the efficient integration over parton distribution functions.
The code is written in Fortran 95 and has been developed using the following compilers under Linux: Lahey Fujitsu, Intel Fortran, GNU gfortran and g95. The stand-alone codes do not need any external library. However, LHAPDF is supported as an option.
People
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Compilers:




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Software Download

Version 2.0.1 (29 January 2015): helac-phegas.2.0.1.tgz
Version 2.0.0 (8 October 2014): helac-phegas.2.0.0.tgz
Version 1.2.2 (13 December 2010): helac-phegas.1.2.2.tgz
Version 1.2.1 (7 July 2010): helac-phegas.1.2.1.tgz
Version 1.2.0 (6 May 2009): helac-phegas.1.2.0.tar.gz
Version 1.1.0 (18 January 2008): tar file
Version 1.0.0 (17 October 2007): tar file
Version 0.1.0 (24 July
2006): tar
file
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References
The following papers should be cited while using HELAC-PHEGAS package
Helac-Phegas: A Generator for all parton level processes
A. Cafarella, C. G. Papadopoulos, M. Worek
Comput. Phys. Commun. 180 (2009) 1941
PHEGAS: A Phase space generator for automatic cross-section computation
C. G. Papadopoulos
Comput. Phys. Commun. 137 (2001) 247
HELAC: A Package to compute electroweak helicity amplitudes
A. Kanaki, C. G. Papadopoulos
Comput. Phys. Commun. 132 (2000) 306
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News &
Developments & Bug Report & Validation
Changes in HELAC-PHEGAS Version 3.0.0

all contributions included is given as the example.
Changes in HELAC-PHEGAS Version 2.0.1

space point is given)
Changes in HELAC-PHEGAS Version 2.0.0

the top anti-top production in di-lepton channel with all contributions of the order of alpha_s = 2 alpha_ew = 4 is given in the user.inp file
Changes in HELAC-PHEGAS Version 1.2.2

Tested on pp -> gamma + 5jets process
Changes in HELAC-PHEGAS Version 1.2.1

- on-shell production of top, W and Z

- thanks to Tim Adye !


Changes in HELAC-PHEGAS Version 1.2.0

lhapdf-5.7.0 version


Changes in HELAC-PHEGAS Version 1.1.0







Validation for
current HELAC-PHEGAS version
(helac-phegas.1.2.1.tgz)
tT production @
TeVatron (CTEQ6L1 from LHAPDF version
5.7.0, scale = mtop)
tT
production @ LHC (CTEQ6L1 from LHAPDF version 5.7.0, scale = mtop)
tT
production @ e+e- (scale = mtop)
e+ve
+ 1j @ LHC (CTEQ6L1 stand-alone, scale = mZ)
e+e-
+ 1j @ LHC (CTEQ6L1 stand-alone, scale =
mZ)
Contact us
If you have a question, comment, suggestion or bug report, please e-mail us at:
Costas.Papadopoulos(at)cern.ch
Malgorzata.Worek(at)cern.ch
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Last modified by Malgorzata Worek
Tue, 7 November, 2017