\unitlength=2.3bp%

\begin{center}
\begin{small}
\begin{feynartspicture}(120,120)(3,3)
%\FALabel(33.,69.96)[]{\large $u\quad u\quad \to\quad W\quad W$}

\FADiagram{}
\FAProp(0.,15.)(6.,13.5)(0.,){/Straight}{1}
\FALabel(3.37593,15.2737)[b]{$u$}
\FAProp(0.,5.)(6.,6.5)(0.,){/Straight}{-1}
\FALabel(3.37593,4.72628)[t]{$u$}
\FAProp(20.,15.)(12.,10.)(0.,){/Sine}{-1}
\FALabel(15.6585,13.3344)[br]{$W$}
\FAProp(20.,5.)(12.,10.)(0.,){/Sine}{1}
\FALabel(16.3415,8.3344)[bl]{$W$}
\FAProp(6.,13.5)(6.,6.5)(0.,){/Straight}{0}
\FALabel(5.18,10.)[r]{$F$}
\FAProp(6.,13.5)(12.,10.)(0.,){/Sine}{0}
\FALabel(9.301,12.6089)[bl]{$V$}
\FAProp(6.,6.5)(12.,10.)(0.,){/Sine}{0}
\FALabel(9.301,7.39114)[tl]{$V$}
\FAVert(6.,13.5){0}
\FAVert(6.,6.5){0}
\FAVert(12.,10.){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,13.5)(0.,){/Sine}{-1}
\FALabel(16.4015,15.2803)[b]{$W$}
\FAProp(20.,5.)(13.5,6.5)(0.,){/Sine}{1}
\FALabel(16.4015,4.71969)[t]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Sine}{0}
\FALabel(5.43,10.)[r]{$V$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Straight}{0}
\FALabel(10.,14.32)[b]{$F$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Straight}{0}
\FALabel(10.,5.68)[t]{$F$}
\FAProp(13.5,13.5)(13.5,6.5)(0.,){/Straight}{0}
\FALabel(14.32,10.)[l]{$F$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,13.5){0}
\FAVert(13.5,6.5){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,13.5)(0.,){/Sine}{-1}
\FALabel(16.4015,15.2803)[b]{$W$}
\FAProp(20.,5.)(13.5,6.5)(0.,){/Sine}{1}
\FALabel(16.4015,4.71969)[t]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Straight}{0}
\FALabel(5.68,10.)[r]{$F$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Sine}{0}
\FALabel(10.,14.57)[b]{$V$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Sine}{0}
\FALabel(10.,5.43)[t]{$V$}
\FAProp(13.5,13.5)(13.5,6.5)(0.,){/ScalarDash}{0}
\FALabel(14.32,10.)[l]{$S$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,13.5){0}
\FAVert(13.5,6.5){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,13.5)(0.,){/Sine}{-1}
\FALabel(16.4015,15.2803)[b]{$W$}
\FAProp(20.,5.)(13.5,6.5)(0.,){/Sine}{1}
\FALabel(16.4015,4.71969)[t]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Straight}{0}
\FALabel(5.68,10.)[r]{$F$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Sine}{0}
\FALabel(10.,14.57)[b]{$V$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Sine}{0}
\FALabel(10.,5.43)[t]{$V$}
\FAProp(13.5,13.5)(13.5,6.5)(0.,){/Sine}{0}
\FALabel(14.57,10.)[l]{$V$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,13.5){0}
\FAVert(13.5,6.5){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,6.5)(0.,){/Sine}{-1}
\FALabel(17.9814,13.8219)[br]{$W$}
\FAProp(20.,5.)(13.5,13.5)(0.,){/Sine}{1}
\FALabel(17.8314,6.42814)[tr]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Sine}{0}
\FALabel(5.43,10.)[r]{$V$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Straight}{0}
\FALabel(10.,14.32)[b]{$F$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Straight}{0}
\FALabel(10.,5.68)[t]{$F$}
\FAProp(13.5,6.5)(13.5,13.5)(0.,){/Straight}{0}
\FALabel(12.68,10.)[r]{$F$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,6.5){0}
\FAVert(13.5,13.5){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,6.5)(0.,){/Sine}{-1}
\FALabel(17.9814,13.8219)[br]{$W$}
\FAProp(20.,5.)(13.5,13.5)(0.,){/Sine}{1}
\FALabel(17.8314,6.42814)[tr]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Straight}{0}
\FALabel(5.68,10.)[r]{$F$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Sine}{0}
\FALabel(10.,14.57)[b]{$V$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Sine}{0}
\FALabel(10.,5.43)[t]{$V$}
\FAProp(13.5,6.5)(13.5,13.5)(0.,){/ScalarDash}{0}
\FALabel(12.68,10.)[r]{$S$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,6.5){0}
\FAVert(13.5,13.5){0}

\FADiagram{}
\FAProp(0.,15.)(6.5,13.5)(0.,){/Straight}{1}
\FALabel(3.59853,15.2803)[b]{$u$}
\FAProp(0.,5.)(6.5,6.5)(0.,){/Straight}{-1}
\FALabel(3.59853,4.71969)[t]{$u$}
\FAProp(20.,15.)(13.5,6.5)(0.,){/Sine}{-1}
\FALabel(17.9814,13.8219)[br]{$W$}
\FAProp(20.,5.)(13.5,13.5)(0.,){/Sine}{1}
\FALabel(17.8314,6.42814)[tr]{$W$}
\FAProp(6.5,13.5)(6.5,6.5)(0.,){/Straight}{0}
\FALabel(5.68,10.)[r]{$F$}
\FAProp(6.5,13.5)(13.5,13.5)(0.,){/Sine}{0}
\FALabel(10.,14.57)[b]{$V$}
\FAProp(6.5,6.5)(13.5,6.5)(0.,){/Sine}{0}
\FALabel(10.,5.43)[t]{$V$}
\FAProp(13.5,6.5)(13.5,13.5)(0.,){/Sine}{0}
\FALabel(12.43,10.)[r]{$V$}
\FAVert(6.5,13.5){0}
\FAVert(6.5,6.5){0}
\FAVert(13.5,6.5){0}
\FAVert(13.5,13.5){0}

\FADiagram{}
\FAProp(0.,15.)(13.5,13.)(0.,){/Straight}{1}
\FALabel(3.41023,15.5279)[b]{$u$}
\FAProp(0.,5.)(6.5,6.)(0.,){/Straight}{-1}
\FALabel(3.48569,4.44802)[t]{$u$}
\FAProp(20.,15.)(6.5,13.)(0.,){/Sine}{-1}
\FALabel(16.5898,15.5279)[b]{$W$}
\FAProp(20.,5.)(13.5,6.)(0.,){/Sine}{1}
\FALabel(16.5143,4.44802)[t]{$W$}
\FAProp(13.5,13.)(6.5,13.)(0.,){/Straight}{0}
\FALabel(10.,12.18)[t]{$F$}
\FAProp(13.5,13.)(13.5,6.)(0.,){/Sine}{0}
\FALabel(14.57,9.5)[l]{$V$}
\FAProp(6.5,6.)(6.5,13.)(0.,){/Straight}{0}
\FALabel(5.68,9.5)[r]{$F$}
\FAProp(6.5,6.)(13.5,6.)(0.,){/Sine}{0}
\FALabel(10.,4.93)[t]{$V$}
\FAVert(13.5,13.){0}
\FAVert(6.5,6.){0}
\FAVert(6.5,13.){0}
\FAVert(13.5,6.){0}

\FADiagram{}
\FAProp(0.,15.)(13.5,13.)(0.,){/Straight}{1}
\FALabel(3.41023,15.5279)[b]{$u$}
\FAProp(0.,5.)(6.5,6.)(0.,){/Straight}{-1}
\FALabel(3.48569,4.44802)[t]{$u$}
\FAProp(20.,15.)(6.5,13.)(0.,){/Sine}{-1}
\FALabel(16.5898,15.5279)[b]{$W$}
\FAProp(20.,5.)(13.5,6.)(0.,){/Sine}{1}
\FALabel(16.5143,4.44802)[t]{$W$}
\FAProp(13.5,13.)(6.5,13.)(0.,){/Sine}{0}
\FALabel(10.,11.93)[t]{$V$}
\FAProp(13.5,13.)(13.5,6.)(0.,){/Straight}{0}
\FALabel(14.32,9.5)[l]{$F$}
\FAProp(6.5,6.)(6.5,13.)(0.,){/Sine}{0}
\FALabel(5.43,9.5)[r]{$V$}
\FAProp(6.5,6.)(13.5,6.)(0.,){/Straight}{0}
\FALabel(10.,5.18)[t]{$F$}
\FAVert(13.5,13.){0}
\FAVert(6.5,6.){0}
\FAVert(6.5,13.){0}
\FAVert(13.5,6.){0}

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