\unitlength=3bp%

\begin{center}
\begin{small}
\begin{feynartspicture}(150,60)(3,2)
%\FALabel(33.,69.96)[]{\large $u\quad g\quad \to\quad \nu_l\quad \nu_l\quad u\quad \gamma$}

\FADiagram{}
\FAProp(0.,15.)(4.,10.)(0.,){/Straight}{1}
\FALabel(1.26965,12.0117)[tr]{$q$}
\FAProp(0.,5.)(4.,10.)(0.,){/Cycles}{0}
\FALabel(2.73035,7.01172)[tl]{$\Pg$}
\FAProp(20.,18.)(14.,15.)(0.,){/Straight}{-1}
\FALabel(16.7868,17.4064)[br]{$\nu_l$}
\FAProp(20.,12.)(14.,15.)(0.,){/Straight}{1}
\FALabel(16.7868,12.5936)[tr]{$\nu_l$}
\FAProp(20.,8.)(14.,5.)(0.,){/Straight}{-1}
\FALabel(16.7868,7.40636)[br]{$q$}
\FAProp(20.,2.)(14.,5.)(0.,){/Sine}{0}
\FALabel(16.7868,2.59364)[tr]{$\gamma$}
\FAProp(4.,10.)(10.,10.)(0.,){/Straight}{1}
\FALabel(7.,11.07)[b]{$q$}
\FAProp(14.,15.)(10.,10.)(0.,){/Sine}{0}
\FALabel(11.2697,12.9883)[br]{$\PZ$}
\FAProp(14.,5.)(10.,10.)(0.,){/Straight}{-1}
\FALabel(11.2697,7.01172)[tr]{$q$}
\FAVert(4.,10.){0}
\FAVert(14.,15.){0}
\FAVert(14.,5.){0}
\FAVert(10.,10.){0}

\FADiagram{}
\FAProp(0.,15.)(4.,10.)(0.,){/Straight}{1}
\FALabel(2.73035,12.9883)[bl]{$q$}
\FAProp(0.,5.)(4.,10.)(0.,){/Cycles}{0}
\FALabel(0.723045,8.42556)[br]{$\Pg$}
\FAProp(20.,18.)(15.5,15.)(0.,){/Straight}{-1}
\FALabel(17.3702,17.3097)[br]{$\nu_l$}
\FAProp(20.,12.)(15.5,15.)(0.,){/Straight}{1}
\FALabel(17.3702,12.6903)[tr]{$\nu_l$}
\FAProp(20.,8.)(11.5,12.5)(0.,){/Straight}{-1}
\FALabel(15.5048,9.36013)[tr]{$q$}
\FAProp(20.,2.)(8.,9.)(0.,){/Sine}{0}
\FALabel(13.699,4.64114)[tr]{$\gamma$}
\FAProp(4.,10.)(8.,9.)(0.,){/Straight}{1}
\FALabel(5.62407,8.47628)[t]{$q$}
\FAProp(15.5,15.)(11.5,12.5)(0.,){/Sine}{0}
\FALabel(13.1585,14.5844)[br]{$\PZ$}
\FAProp(11.5,12.5)(8.,9.)(0.,){/Straight}{-1}
\FALabel(9.13398,11.366)[br]{$q$}
\FAVert(4.,10.){0}
\FAVert(15.5,15.){0}
\FAVert(11.5,12.5){0}
\FAVert(8.,9.){0}

\FADiagram{}
\FAProp(0.,15.)(10.,5.5)(0.,){/Straight}{1}
\FALabel(3.19219,13.2012)[bl]{$q$}
\FAProp(0.,5.)(10.,14.5)(0.,){/Cycles}{0}
\FALabel(3.19219,6.79875)[tl]{$\Pg$}
\FAProp(20.,18.)(17.,15.)(0.,){/Straight}{-1}
\FALabel(17.884,17.116)[br]{$\nu_l$}
\FAProp(20.,12.)(17.,15.)(0.,){/Straight}{1}
\FALabel(19.116,14.116)[bl]{$\nu_l$}
\FAProp(20.,8.)(13.5,14.)(0.,){/Straight}{-1}
\FALabel(16.1787,10.3411)[tr]{$q$}
\FAProp(20.,2.)(10.,5.5)(0.,){/Sine}{0}
\FALabel(14.488,2.76702)[t]{$\gamma$}
\FAProp(10.,5.5)(10.,14.5)(0.,){/Straight}{1}
\FALabel(11.27,8.5)[l]{$q$}
\FAProp(10.,14.5)(13.5,14.)(0.,){/Straight}{1}
\FALabel(11.9692,15.3044)[b]{$q$}
\FAProp(17.,15.)(13.5,14.)(0.,){/Sine}{0}
\FALabel(14.8242,15.5104)[b]{$\PZ$}
\FAVert(10.,5.5){0}
\FAVert(10.,14.5){0}
\FAVert(17.,15.){0}
\FAVert(13.5,14.){0}

\FADiagram{}
\FAProp(0.,15.)(8.,14.5)(0.,){/Straight}{1}
\FALabel(4.09669,15.817)[b]{$q$}
\FAProp(0.,5.)(8.,5.5)(0.,){/Cycles}{0}
\FALabel(4.09669,4.18302)[t]{$\Pg$}
\FAProp(20.,18.)(14.,15.)(0.,){/Straight}{-1}
\FALabel(16.7868,17.4064)[br]{$\nu_l$}
\FAProp(20.,12.)(14.,15.)(0.,){/Straight}{1}
\FALabel(16.7868,12.5936)[tr]{$\nu_l$}
\FAProp(20.,8.)(14.,5.)(0.,){/Straight}{-1}
\FALabel(16.7868,7.40636)[br]{$q$}
\FAProp(20.,2.)(14.,5.)(0.,){/Sine}{0}
\FALabel(16.7868,2.59364)[tr]{$\gamma$}
\FAProp(8.,14.5)(8.,5.5)(0.,){/Straight}{1}
\FALabel(6.93,10.)[r]{$q$}
\FAProp(8.,14.5)(14.,15.)(0.,){/Sine}{0}
\FALabel(10.8713,15.8146)[b]{$\PZ$}
\FAProp(8.,5.5)(14.,5.)(0.,){/Straight}{1}
\FALabel(10.8713,4.18535)[t]{$q$}
\FAVert(8.,14.5){0}
\FAVert(8.,5.5){0}
\FAVert(14.,15.){0}
\FAVert(14.,5.){0}

\FADiagram{}
\FAProp(0.,15.)(8.,14.5)(0.,){/Straight}{1}
\FALabel(4.09669,15.817)[b]{$q$}
\FAProp(0.,5.)(8.,5.5)(0.,){/Cycles}{0}
\FALabel(4.09669,4.18302)[t]{$\Pg$}
\FAProp(20.,18.)(13.5,15.)(0.,){/Straight}{-1}
\FALabel(16.5805,17.4273)[br]{$\nu_l$}
\FAProp(20.,12.)(13.5,15.)(0.,){/Straight}{1}
\FALabel(16.5805,12.5727)[tr]{$\nu_l$}
\FAProp(20.,8.)(8.,5.5)(0.,){/Straight}{-1}
\FALabel(15.437,8.0267)[b]{$q$}
\FAProp(20.,2.)(8.,10.)(0.,){/Sine}{0}
\FALabel(16.0956,3.41321)[tr]{$\gamma$}
\FAProp(8.,14.5)(13.5,15.)(0.,){/Sine}{0}
\FALabel(10.6097,15.8136)[b]{$\PZ$}
\FAProp(8.,14.5)(8.,10.)(0.,){/Straight}{1}
\FALabel(6.93,12.25)[r]{$q$}
\FAProp(8.,5.5)(8.,10.)(0.,){/Straight}{-1}
\FALabel(6.93,7.75)[r]{$q$}
\FAVert(8.,14.5){0}
\FAVert(8.,5.5){0}
\FAVert(13.5,15.){0}
\FAVert(8.,10.){0}

\FADiagram{}
\FAProp(0.,15.)(8.,14.5)(0.,){/Straight}{1}
\FALabel(4.09669,15.817)[b]{$q$}
\FAProp(0.,5.)(8.,5.5)(0.,){/Cycles}{0}
\FALabel(4.09669,4.18302)[t]{$\Pg$}
\FAProp(20.,18.)(15.5,15.)(0.,){/Straight}{-1}
\FALabel(17.3702,17.3097)[br]{$\nu_l$}
\FAProp(20.,12.)(15.5,15.)(0.,){/Straight}{1}
\FALabel(17.3702,12.6903)[tr]{$\nu_l$}
\FAProp(20.,8.)(8.,5.5)(0.,){/Straight}{-1}
\FALabel(11.551,4.73525)[t]{$q$}
\FAProp(20.,2.)(8.,14.5)(0.,){/Sine}{0}
\FALabel(16.7997,3.80687)[tr]{$\gamma$}
\FAProp(8.,14.5)(8.,10.)(0.,){/Straight}{1}
\FALabel(6.93,12.25)[r]{$q$}
\FAProp(8.,5.5)(8.,10.)(0.,){/Straight}{-1}
\FALabel(6.93,7.75)[r]{$q$}
\FAProp(15.5,15.)(8.,10.)(0.,){/Sine}{0}
\FALabel(13.2061,14.5881)[br]{$\PZ$}
\FAVert(8.,14.5){0}
\FAVert(8.,5.5){0}
\FAVert(15.5,15.){0}
\FAVert(8.,10.){0}

\end{feynartspicture}
\end{small}
\end{center}
