1

I want to align the propagators that go from the circle to the vertices p_3 and p_4

Here is my MWE:

\documentclass[amsmath,amssymb,aps,12pt,eqsecnum]{revtex4}    
\usepackage[a4paper]{geometry}    
\linespread{1}      
\usepackage{slashed}          
\usepackage{simplewick}        
\usepackage{feynmp-auto}        
\usepackage[pdftex]{graphicx}        
\usepackage{textcomp}        
\usepackage{gensymb}         
\begin{document}     
\begin{fmffile}{counterterms3}        
    \begin{fmfgraph*}(100,100)    
        \fmfbottom{i0,i1,i2,i3}    
        \fmftop{o1,o2}    
        \fmf{plain}{i1,v2}    
        \fmf{plain}{i2,v1}    
        \fmf{plain,left}{v2,v3}    
        \fmf{plain,right}{v1,v3}    
        \fmf{plain}{v3,o1}    
        \fmf{plain}{v3,o2}    
        \fmfv{label=$p_1$}{i1}    
        \fmfv{label=$p_2$}{i2}    
        \fmfv{label=$p_3$}{o1}    
        \fmfv{label=$p_4$}{o2}    
        \fmffreeze    
        \fmf{phantom}{v1,v2}    
        \fmf{plain,left}{v1,v2}    
        \fmf{plain,left}{v2,v1}   
        \fmf{dot}{v3}    
    \end{fmfgraph*}    
\end{fmffile}    
\end{document}

Diagram

As you can see, the propagators from the circle go horizontal at the vertex with the dot, rather than going in the same direction as the propagators which lead to p_3 and p_4

  • Can you explain more clearly how exactly you want to align them? Do you want them to not meet in a single vertex marked with the dot, but to have some offset from the vertex? – BartoNaz Jul 7 '16 at 10:56
2

You may make these curves parallel by playing with left and right.

\begin{fmfgraph*}(100,100)    
    \fmfbottom{i0,i1,i2,i3}    
    \fmftop{o1,o2}    
    \fmf{plain}{i1,v2}    
    \fmf{plain}{i2,v1}    
    \fmf{phantom,left}{v2,v3}    
    \fmf{phantom,right}{v1,v3}    
    \fmf{plain}{v3,o1}    
    \fmf{plain}{v3,o2}    
    \fmfv{label=$p_1$}{i1}    
    \fmfv{label=$p_2$}{i2}    
    \fmfv{label=$p_3$}{o1}    
    \fmfv{label=$p_4$}{o2}    
    \fmffreeze    
    \fmf{plain,left=1.45}{v2,v3}    
    \fmf{plain,right=1.45}{v1,v3}    
    \fmf{phantom}{v1,v2}    
    \fmf{plain,left}{v1,v2}    
    \fmf{plain,left}{v2,v1}   
    \fmf{dot}{v3}    
\end{fmfgraph*}    

enter image description here

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