!
! Feynman triangle graph for pi0 decay
!
exec lecture_fig_setup pi0decay 9 8 1 1 0.5 0.5
set y psize =+0.5
set font -1001
set font title -1004
!
exec lecture_fig_copy '[p]^0! Decay' 0
!
set tick all off
!
exec lecture_fig_plot
draw arrow 1 blue = pl -4
1 4 4 4
draw arrow 1 red = pl -4
4 4 6 6
draw arrow 1 red = pl -4
6 6 6 2
draw arrow 1 red = pl -4
6 2 4 4
draw sine 1 green = pl
6 6 8 6
draw sine 1 green = pl
6 2 8 2
comment 1 
  new '[p]^0!' 0.9 3.8 = = r pl = blue
  new '[g]'  8.1 5.9 = = l pl = green
  new '[g]'  8.1 1.9 = = l pl = green
  new 'u' 4.6 5.0 = = l pl = red
  new 'u' 6.1 3.9 = = l pl = red
  new 'u' 4.6 2.7 = = l pl = red
end
!
@9 hard epost
@9 close