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! WHIZARD <<Version>> <<Date>>
! Copyright (C) 1999-2011 by
! Wolfgang Kilian <kilian@physik.uni-siegen.de>
! Thorsten Ohl <ohl@physik.uni-wuerzburg.de>
! Juergen Reuter <juergen.reuter@desy.de>
! Christian Speckner <christian.speckner@physik.uni-freiburg.de>
! with contributions by Sebastian Schmidt, Daniel Wiesler, Felix Braam
!
! WHIZARD is free software; you can redistribute it and/or modify it
! under the terms of the GNU General Public License as published by
! the Free Software Foundation; either version 2, or (at your option)
! any later version.
!
! WHIZARD is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of
! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License
! along with this program; if not, write to the Free Software
! Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
module constants
use kinds, only: default
implicit none
private
complex(default), parameter, public :: &
imago = (0._default, 1._default)
real(default), parameter, public :: &
zero = 0.0_default, &
one = 1.0_default, two = 2.0_default, three = 3.0_default, &
four = 4.0_default, five = 5.0_default
real(default), parameter, public :: &
pi = 3.1415926535897932384626433832795028841972_default
real(default), parameter, public :: &
twopi = 2*pi, &
twopi2 = twopi**2, twopi3 = twopi**3, twopi4 = twopi**4, &
twopi5 = twopi**5, twopi6 = twopi**6
real(default), parameter, public :: &
degree = pi/180
real(default), parameter, public :: &
conv = 0.38937966e12_default
real(default), parameter, public :: &
pb_per_fb = 1.e-3_default
real(default), parameter, public :: &
NC = three, CF = (NC**2 - one)/two/NC, CA = NC, &
TR = one/two
character(*), parameter, public :: &
energy_unit = "GeV"
character(*), parameter, public :: &
cross_section_unit = "fb"
end module constants

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