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\pdf_title "Feynman Diagrams"
\pdf_author "LyX Team, Uwe Stöhr, Ronen Abravanel"
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\begin_layout Title
Feynman Diagrams
\end_layout

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status open

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authors: Uwe Stöhr and Ronen Abravanel
\end_layout

\end_inset


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To be able to create 
\noun on
Feynman
\noun default
 diagrams, the LaTeX-package 
\series bold
feyn
\series default
 must be installed.
 A 
\noun on
Feynman
\noun default
 diagram is created by inserting the command 
\series bold

\backslash
Diagram
\series default
 in a formula.
 Then you are able to add new matrix columns and rows like a normal matrices.
 
\end_layout

\begin_layout Standard
As matrix entry, one can enter commands that act as 
\begin_inset Quotes eld
\end_inset

particles
\begin_inset Quotes erd
\end_inset

 or 
\begin_inset Quotes eld
\end_inset

propagators
\begin_inset Quotes erd
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, for example:
\end_layout

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Commands
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Description
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Example
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Result
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f,g,h
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\noindent
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fermion, photon or ghost propagator
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f
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g
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h
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fermion/photon, going up/down/vertical
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fd
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particle-momentum specification
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\begin_inset Text

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the vertex label 
\emph on
p
\emph default
 is either '^' or '_' for labeling above or below the vertex
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<row>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
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</cell>
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<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text

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fglS\vertexlabel_{\gamma}
}
$
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\end_layout

\begin_layout Standard
These are just some of the features of thepackage 
\series bold
feyn
\series default
 whose user manual can be found in 
\begin_inset CommandInset citation
LatexCommand cite
key "Feyn"

\end_inset

.
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\begin_layout Standard
\begin_inset Note Greyedout
status open

\begin_layout Plain Layout

\series bold
Note:
\series default
 If you have an index list in your document and use one of the AMS theorem
 modules, you have to add the option 
\series bold
noglobalbang
\series default
 to the document class options in the document settings.
 This enables the usage of the '!' character in index entries (necessary
 for subentries) but might cause troubles with the align environments (which
 are described in section 
\begin_inset Quotes eld
\end_inset

Align Environments
\begin_inset Quotes erd
\end_inset

 of LyX's Math manual).
\end_layout

\end_inset


\end_layout

\begin_layout Bibliography
\begin_inset CommandInset bibitem
LatexCommand bibitem
key "Feyn"

\end_inset


\begin_inset CommandInset href
LatexCommand href
name "Documentation"
target "http://mirror.ctan.org/fonts/feyn/feyn.pdf"

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 of the LaTeX package 
\series bold
feyn
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\end_body
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