# Rotating labels in feyn

Is there any way to rotate labels in feynmp? I want the dots in this picture to run from k_1 to k_n, so I need to rotate the labels by about 80 degrees clockwise. Thanks!

MWE:

\documentclass[amsmath,amssymb,aps,12pt,eqsecnum]{revtex4}
\usepackage[a4paper]{geometry}
\usepackage{slashed}
\usepackage{simplewick}
\usepackage{feynmp-auto}
\usepackage[pdftex]{graphicx}
\usepackage{textcomp}
\usepackage{gensymb}
\begin{document}

\begin{fmffile}{graph41}
\begin{fmfgraph*}(120,120)
\fmfcmd{input vbloboval;}
\fmfleftn{i}{9}
\fmfright{o1,o2}
\fmfblobOval{0.16w}{v1}
\fmf{fermion}{o1,v1}
\fmf{fermion,label=$p'$}{v1,i7}
\fmffreeze
\fmf{photon}{v1,i1}
\fmf{photon}{v1,i2}
\fmf{photon}{v1,i3}
\fmfv{label=$k_1$}{i3}
\fmfv{label=$\cdots$}{i2}
\fmfv{label=$k_n$}{i1}
\end{fmfgraph*}
\end{fmffile}

\end{document}


You may have to play with the angles and labels a bit, but this shows how to use \rotatebox to achieve a rotated label.

For those not familiar with feynmp protocol, one must first pdflatex the file; then mpost graph41.mp; and finally pdflatex it again.

EDITED to attempt to lower labels into alignment, though the algorithm of fmfgraph seems to want to restrict the label relocation somewhat. REEDITED to use \rule as the label-realignment mechanism.

\documentclass[amsmath,amssymb,aps,12pt,eqsecnum]{revtex4}
\usepackage[a4paper]{geometry}
\usepackage{slashed}
\usepackage{simplewick}
\usepackage{feynmp-auto}
\usepackage[pdftex]{graphicx}
\usepackage{textcomp}
\usepackage{gensymb}
\begin{document}

\begin{fmffile}{graph41}
\begin{fmfgraph*}(120,120)
%    \fmfcmd{input vbloboval;}
\fmfleftn{i}{9}
\fmfright{o1,o2}
%    \fmfblobOval{0.16w}{v1}
\fmf{fermion}{o1,v1}
\fmf{fermion,label=$p'$}{v1,i7}
\fmffreeze
\fmf{photon}{v1,i1}
\fmf{photon}{v1,i2}
\fmf{photon}{v1,i3}
\fmfv{label=\rotatebox{-65}{\rule{0pt}{10pt}{$k_1$}}}{i3}
\fmfv{label=\rotatebox{-70}{\rule{0pt}{7pt}{$\cdots$}}}{i2}
\fmfv{label=\rotatebox{-65}{$k_n$}}{i1}
\end{fmfgraph*}
\end{fmffile}

\end{document}


• Thanks, any idea how to shift the labels upwards/downwards or left/right? I tried: \fmfv{label=\rotatebox{-70}{\raisebox{50pt}{$\cdots$}}}{i2} but it didn't have any effect – supercoolphysicist Jan 20 '15 at 20:36
• @supercoolphysicist Please see my revision. I improved the label alignment with some vertical motion prior to the rotate, but the fmfgraph seems to want to resist the relocation. A \raisebox (which would have been the logical choice) seemed to have no effect. – Steven B. Segletes Jan 20 '15 at 20:47
• @supercoolphysicist I simplified the revision to use \rule and it seems to work OK. – Steven B. Segletes Jan 20 '15 at 20:59
• Thanks for the help, I would ideally like the k_1 and k_n labels to remain upright, something along the lines of: \fmfv{label=$k_1$}{i3} \fmfv{label=\rule{0pt}{-20pt}{\rotatebox{-70}{$\cdots$}}} {i2} \fmfv{label=$k_n$}{i1} (Sorry I can't get that to display correctly, but basically I only want to adjust the dots) – supercoolphysicist Jan 20 '15 at 21:20
• @supercoolphysicist maybe something like \fmfv{label=\rule{0pt}{8pt}$k_1~~$}{i3}\fmfv{label=\rotatebox{-70}{$\cdots\phantom{~\cdots}$}}{i2}\fmfv{label=$k_n~$}{i1}? In any event, controlling the placement is a royal pain. – Steven B. Segletes Jan 21 '15 at 0:57