% !TEX program = pdflatexmk
% !TEX parameter = -shell-escape
% Author: Izaak Neutelings (September 24)
% Instructions: To compile via command line, run the following twice
%   pdflatex -shell-escape extract/anomalous_momentum_pp_tautau$TAG.tex
\documentclass[11pt,border=4pt]{standalone}
\usepackage{feynmp-auto}
\usepackage{xcolor}
\definecolor{coldis}{rgb}{.9,.5,.0} % disassociated (orange)
\begin{document}
\begin{fmffile}{feyngraph}
  \fmfframe(-4,10)(8,10){ % padding (L,T)(R,B)
  \begin{fmfgraph*}(110,80) % canvas (W,H)
    % line style
    \fmfset{wiggly_len}{12} % boson wavelength
    \fmfset{wiggly_slope}{65} % boson slope of waves
    % external vertices
    \fmfleft{i2,i1}
    \fmfright{o2,o1}
    % photons
    \fmf{photon}{i1,v1}
    \fmf{photon}{i2,v2}
    % bosons
    \fmf{boson,t=0.9,label=\color{coldis} W,l.s=right,f=(.9,,.5,,.0)}{v1,v2} % t channel
    \fmf{boson,f=(.9,,.5,,.0)}{o1,v1} % outgoing top boson
    \fmf{boson,f=(.9,,.5,,.0)}{v2,o2} % outgoing bottom boson
    % labels
    \fmfv{l=$\gamma$,l.a=160,l.d=5}{i1}
    \fmfv{l=$\gamma$,l.a=-158,l.d=6}{i2}
    \fmfv{l=\strut\color{coldis} W$^+$,l.a=12,l.d=5}{o1}
    \fmfv{l=\strut\color{coldis} W$^-$\vspace{-7pt},l.a=-16,l.d=5}{o2}
    %\fmfv{decor.shape=circle,f=(.9,,.5,,.0),decor.filled=full,decor.size=4}{v1}
    %\fmfv{decor.shape=circle,f=(.9,,.5,,.0),decor.filled=full,decor.size=4}{v2}
  \end{fmfgraph*}
  } % close \fmfframe
\end{fmffile}
\end{document}