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\pdf_title "Feynman Diagrams"
\pdf_author "LyX Team, Uwe Stöhr, Ronen Abravanel"
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\begin_body

\begin_layout Title
Feynman Diagrams
\end_layout

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\begin_inset Note Note
status open

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authors: Uwe Stöhr and Ronen Abravanel
\end_layout

\end_inset


\end_layout

\begin_layout Standard
To be able to create 
\noun on
Feynman
\noun default
 diagrams, the \SpecialChar 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
\end_inset

, for example:
\end_layout

\begin_layout Standard
\align center
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\begin_inset Text

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Commands
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</cell>
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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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\begin_layout Plain Layout
\noindent
\align left
fermion, photon or ghost propagator
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f
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g
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h
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$
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fu,fd,fv (gu,gd,gv)
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fermion/photon, going up/down/vertical
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fd
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gu
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fv
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$
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fA,fV
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A and V are modifiers to produce arrow going left/up or right/down
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gvV
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fermions/photons loop
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f
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gl
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$
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\backslash
momentum{ch}{text}
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\begin_inset Text

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\noindent
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particle-momentum specification
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<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

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\begin_inset Text

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$
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\backslash
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\begin_inset Text

\begin_layout Plain Layout
\noindent
\align left
the vertex label 
\emph on
p
\emph default
 is either '^' or '_' for labeling above or below the vertex
\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
\begin_inset Tabular
<lyxtabular version="3" rows="2" columns="1">
<features tabularvalignment="middle">
<column alignment="center" valignment="top">
<row>
<cell alignment="center" valignment="top" bottomline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
\begin_inset Formula $\backslash\mathrm{vertexlabel}^{e^{+}}fA$
\end_inset


\end_layout

\end_inset
</cell>
</row>
<row>
<cell alignment="center" valignment="top" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
\begin_inset Formula $fglS\backslash\mathrm{vertexlabel}_{\gamma}$
\end_inset


\end_layout

\end_inset
</cell>
</row>
</lyxtabular>

\end_inset


\end_layout

\end_inset
</cell>
<cell alignment="center" valignment="top" topline="true" bottomline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\begin_layout Plain Layout
\begin_inset Formula $\Diagram{\vertexlabel^{\mathrm{e^{+}}}fA\\
fglS\vertexlabel_{\gamma}
}
$
\end_inset


\end_layout

\end_inset
</cell>
</row>
</lyxtabular>

\end_inset


\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"
literal "true"

\end_inset

.
\end_layout

\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 \SpecialChar LyX
's Math manual).
\end_layout

\end_inset


\end_layout

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

\end_inset


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

\end_inset

 of the \SpecialChar LaTeX
 package 
\series bold
feyn
\end_layout

\end_body
\end_document
