!
! Photon-quark scattering
!
exec lecture_fig_setup gammaq_gluonq 10 10 1 1 0.2 0.2
set font -1001
set tick all off
!
exec lecture_fig_copy '[g]^*!q?1! -> gq?2!' 0
!
exec lecture_fig_plot 0
!
draw sine 1 blue = pl
1 5 4.5 5
draw arrow 1 green = pl -4
9 5 5.5 5
draw arrow 1 green = pl -4
5.2 5.4 7 9
draw gluon 1 red = pl
4.8 4.6 3 1
draw segm 1 black = pl
6 5 5.5 6
0.2
!
comment 1
  new '[g]^*!' 0.8 4.8 = = r pl = blue
  new 'k'      3.0 5.4 = = c pl = blue
  new 'q?1!'   9.2 4.8 = = l pl = green
  new 'q?2!'   7.1 9.2 = = l pl = green
  new 'k[\242]' 5.8 6.8 = = r pl = blue
  new '[q]^*!'  6.0 5.6 = = l pl = black
end
!
@9 hard epost
@9 close