\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}{BuToKstPhi_diagram} \centering 
        \begin{fmfgraph*}(280,220) 
            \fmfstraight   
            
            \fmfleft{l8,l7,l6,l5,l4,l3,l2,l1,l0}
            \fmfright{r8,r7,r6,r5,r4,r3,r2,r1,r0}     
              
            \fmf{phantom}{l0,a1,a2,a3,a4,a5,a6,a7,a8,r0}      
            \fmf{phantom}{l4,d1,d2,d3,d4,d5,d6,d7,d8,d9,r4}   
            \fmf{phantom}{l8,g1,g2,g3,g4,g5,g6,g7,g8,r8}  
                        
            \fmffreeze
            
            %Make B+
            \fmf{fermion,label=$\bar{b}$,tension=1.0, label.side=left}{l0,a3} 
            \fmf{fermion,label=$u$,tension=1.0, label.side=left}{l8,g3} 
        
            
            %Make photon
            \fmf{photon,label=$W^+$, label.side=left}{a3,g3} 
                    
            
            %Make s\bar{s}
            \fmf{fermion,right=0.3,label=${s}$,tension=1.0,label.side=left}{d6,r5}     
            \fmf{fermion,right=0.3,label=$\bar{s}$,tension=1.0,label.side=left}{r3,d6}
            
            %Make the W fermions
            \fmf{fermion,label=$\bar{s}$,tension=1.0, label.side=left}{a3,r0} 
            \fmf{fermion,label=$s$,tension=1.0, label.side=left}{g3,r8} 
      
            %Make the blobs
            \fmf{plain,right=-0.3,tension=-0.5,label=$B^+$, label.side=right,label.dist=0.5}{l0,l8}  
            \fmf{plain,right=0.3,tension=-0.5}{l0,l8}   
            
            \fmf{plain,right=-0.4,tension=-0.5,label=$K^*$, label.side=right,label.dist=0.45}{r8,r5}   
            \fmf{plain,right=0.4,tension=-0.5}{r8,r5} 
            
            \fmf{plain,right=-0.4,tension=-0.5,label=$\phi$, label.side=right,label.dist=0.45}{r0,r3}   
            \fmf{plain,right=0.4,tension=-0.5}{r0,r3}     
                        
      
            
        \end{fmfgraph*}
    \end{fmffile}
    \pagestyle{empty}
\end{document}