\unitlength=3.bp%

\begin{center}
\begin{small}
\begin{feynartspicture}(150,30)(4,1)
%\FALabel(33.,69.96)[]{\large $u\quad \gamma\quad \to\quad l\quad l\quad u$}

\FADiagram{}
\FAProp(0.,15.)(5.5,10.)(0.,){/Straight}{1}
\FALabel(2.18736,11.8331)[tr]{$q$}
\FAProp(0.,5.)(5.5,10.)(0.,){/Sine}{0}
\FALabel(3.31264,6.83309)[tl]{$\gamma$}
\FAProp(20.,17.)(15.5,13.5)(0.,){/Straight}{-1}
\FALabel(17.2784,15.9935)[br]{$l$}
\FAProp(20.,10.)(15.5,13.5)(0.,){/Straight}{1}
\FALabel(18.2216,12.4935)[bl]{$l$}
\FAProp(20.,3.)(12.,10.)(0.,){/Straight}{-1}
\FALabel(15.4593,5.81351)[tr]{$q$}
\FAProp(5.5,10.)(12.,10.)(0.,){/Straight}{1}
\FALabel(8.75,8.93)[t]{$q$}
\FAProp(15.5,13.5)(12.,10.)(0.,){/Sine}{0}
\FALabel(13.134,12.366)[br]{$\mathrm{Z}/\gamma$}
\FAVert(5.5,10.){0}
\FAVert(15.5,13.5){0}
\FAVert(12.,10.){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.,){/Sine}{0}
\FALabel(3.10297,6.58835)[tl]{$\gamma$}
\FAProp(20.,17.)(10.,14.5)(0.,){/Straight}{-1}
\FALabel(14.6241,16.7737)[b]{$l$}
\FAProp(20.,10.)(10.,10.)(0.,){/Straight}{1}
\FALabel(15.95,11.07)[b]{$l$}
\FAProp(20.,3.)(10.,5.5)(0.,){/Straight}{-1}
\FALabel(14.6241,3.22628)[t]{$q$}
\FAProp(10.,5.5)(10.,10.)(0.,){/Sine}{0}
\FALabel(11.07,7.75)[l]{$\mathrm{Z}/\gamma$}
\FAProp(10.,14.5)(10.,10.)(0.,){/Straight}{-1}
\FALabel(11.07,12.25)[l]{$l$}
\FAVert(10.,5.5){0}
\FAVert(10.,14.5){0}
\FAVert(10.,10.){0}


\FADiagram{}
\FAProp(0.,15.)(10.,14.5)(0.,){/Straight}{1}
\FALabel(5.0774,15.8181)[b]{$q$}
\FAProp(0.,5.)(10.,5.5)(0.,){/Sine}{0}
\FALabel(5.0774,4.18193)[t]{$\gamma$}
\FAProp(20.,17.)(10.,10.)(0.,){/Straight}{-1}
\FALabel(15.8366,15.2248)[br]{$l$}
\FAProp(20.,10.)(10.,5.5)(0.,){/Straight}{1}
\FALabel(17.7693,10.1016)[br]{$l$}
\FAProp(20.,3.)(10.,14.5)(0.,){/Straight}{-1}
\FALabel(16.7913,4.81596)[tr]{$q$}
\FAProp(10.,14.5)(10.,10.)(0.,){/Sine}{0}
\FALabel(8.93,12.25)[r]{$\mathrm{Z}/\gamma$}
\FAProp(10.,5.5)(10.,10.)(0.,){/Straight}{1}
\FALabel(8.93,7.75)[r]{$l$}
\FAVert(10.,14.5){0}
\FAVert(10.,5.5){0}
\FAVert(10.,10.){0}

\FADiagram{}
\FAProp(0.,15.)(10.,13.)(0.,){/Straight}{1}
\FALabel(5.30398,15.0399)[b]{$q$}
\FAProp(0.,5.)(10.,5.5)(0.,){/Sine}{0}
\FALabel(5.0774,4.18193)[t]{$\gamma$}
\FAProp(20.,17.)(15.5,13.5)(0.,){/Straight}{-1}
\FALabel(17.2784,15.9935)[br]{$l$}
\FAProp(20.,10.)(15.5,13.5)(0.,){/Straight}{1}
\FALabel(18.2216,12.4935)[bl]{$l$}
\FAProp(20.,3.)(10.,5.5)(0.,){/Straight}{-1}
\FALabel(15.3759,5.27372)[b]{$q$}
\FAProp(10.,13.)(10.,5.5)(0.,){/Straight}{1}
\FALabel(8.93,9.25)[r]{$q$}
\FAProp(10.,13.)(15.5,13.5)(0.,){/Sine}{0}
\FALabel(12.8903,12.1864)[t]{$\mathrm{Z}/\gamma$}
\FAVert(10.,13.){0}
\FAVert(10.,5.5){0}
\FAVert(15.5,13.5){0}

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

