<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">% !TEX program = pdflatexmk
% !TEX parameter = -shell-escape
% Author: Izaak Neutelings (March 25)
% Instructions: To compile via command line, run the following twice
%   pdflatex -shell-escape extract/LQ$TAG.tex
\documentclass[11pt,border=4pt]{standalone}
\usepackage{feynmp-auto}
\usepackage{xcolor}
\definecolor{colvtx}{rgb}{0,.1,1} % LQ vertex (blue)
\begin{document}
\begin{fmffile}{feyngraph}
  \fmfframe(-10,14)(12,11){ % padding (L,T)(R,B)
  \begin{fmfgraph*}(130,90) % dimensions (WH)
    % line style
    \fmfset{dash_len}{10} % dashes length
    \fmfset{wiggly_len}{12} % boson wavelength
    \fmfset{wiggly_slope}{65} % boson slope of waves
    % external vertices
    \fmfleft{i2,i1}
    \fmfright{o4,o3,o2,o1}
    \fmfshift{12 down}{i1}
    \fmfshift{12 up}{i2}
    % gluon splitting
    \fmf{gluon}{v1,i1}
    \fmf{gluon}{i2,v2}
    \fmf{fermion,t=0.9,l.s=left,label=b}{v2,v1} % t-channel
    \fmf{phantom,t=0.6}{v1,o1,o4,v2}
    \fmffreeze
    % outgoing bottom quarks
    \fmf{fermion}{v1,lq1}
    \fmf{fermion,t=0.8}{lq1,o1}
    \fmf{fermion}{o4,v2}
    \fmffreeze
    % LQ -&gt; btau
    \fmf{dashes,t=0.9,l.s=right,l.d=4,label=LQ}{lq1,lq2}
    \fmf{fermion,t=0.9}{o2,lq2,o3}
    \fmf{phantom,t=0.9}{v2,lq2}
    % vertex
    \fmfv{d.sh=circle,d.f=full,d.si=4,f=(0,,.1,,1),
          l=\color{colvtx}$\lambda$,l.d=6,l.a=120}{lq1}
    % labels
    \fmfv{l.a=160,l.d=4,l=$g$}{i1}
    \fmfv{l.a=-160,l.d=4,l=$g$}{i2}
    \fmfv{l.a=25,l.d=4,l=$\tau^-$}{o1}
    \fmfv{l.a=25,l.d=4,l=\vspace{-2pt}$\tau^+$}{o2}
    \fmfv{l.a=-20,l.d=5,l=b}{o3}
    \fmfv{l.a=-20,l.d=5,l=\vspace{-2pt}b}{o4}
  \end{fmfgraph*}
  } % close \fmfframe
\end{fmffile}
\end{document}</pre></body></html>