\documentclass{article}
\usepackage[paperheight=110mm,paperwidth=125mm, margin=15mm]{geometry}
\usepackage{feynmp-auto}
%\addtolength{\oddsidemargin}{-10mm}
%\addtolength{\evensidemargin}{-10mm}
% commas in feynmp sometimes lead to strange errors, use \comma instead
\DeclareMathSymbol{\comma}{\mathpunct}{letters}{"3B}

\begin{document}\LARGE
    \centering
    \begin{fmffile}{BuToKstJpsi_diagram} \centering 
        \begin{fmfgraph*}(280,220) 
            \fmfstraight   
            
            \fmfleft{l6,l5,l4,l3,l2,l1,l0}
            \fmfright{r6,r5,r4,r3,r2,r1,r0}     
                
            \fmf{phantom}{l2,c1,c2,c3,c4,c5,c6,c7,r2}     
            \fmf{phantom}{l4,e1,e2,e3,e4,e5,e6,e7,r4} 
                        
            \fmffreeze
            
            %Make the spectator quark            
            \fmf{fermion,label=$u$,tension=1.0, label.side=left}{l6,r6} 
              
            %Make b to c
            \fmf{fermion,label=$\bar{b}$,tension=1.0,label.side=left}{c4,l2}     
            \fmf{fermion,label=$\bar{c}$,tension=1.0,label.side=left}{r0,c4}
              
            %Make the blobs
            \fmf{plain,right=-0.3,tension=-0.5,label=$B^+$, label.side=right,label.dist=5.4}{l2,l6}  
            \fmf{plain,right=0.3,tension=-0.5}{l2,l6}   
            
            \fmf{plain,right=-0.4,tension=-0.5,label=$K^*$, label.side=right,label.dist=2.2}{r4,r6}   
            \fmf{plain,right=0.4,tension=-0.5}{r4,r6}                                                       
            
            \fmf{plain,right=-0.5,tension=-0.5,label=$J/\psi$, label.side=right,label.dist=2.2}{r0,r2}   
            \fmf{plain,right=0.5,tension=-0.5}{r0,r2}                                                       
            %Make W
            \fmf{photon,label=$W^+$, label.side=right}{c4,e5} 
                       
            %Make b to c
            \fmf{fermion,label=$c$,tension=1.0,label.side=left}{e5,r2}     
            \fmf{fermion,label=$\bar{s}$,tension=1.0,label.side=left}{r4,e5}
            
        \end{fmfgraph*}
    \end{fmffile}
    \pagestyle{empty}
\end{document}