\hypertarget{classvertex__lcfi_1_1ZVTOP_1_1GaussTube}{\subsection{vertex\-\_\-lcfi\-:\-:Z\-V\-T\-O\-P\-:\-:Gauss\-Tube Class Reference}
\label{classvertex__lcfi_1_1ZVTOP_1_1GaussTube}\index{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube@{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube}}
}


Gaussian tube component of the vertex function.  




{\ttfamily \#include $<$gausstube.\-h$>$}



Inheritance diagram for vertex\-\_\-lcfi\-:\-:Z\-V\-T\-O\-P\-:\-:Gauss\-Tube\-:


Collaboration diagram for vertex\-\_\-lcfi\-:\-:Z\-V\-T\-O\-P\-:\-:Gauss\-Tube\-:
\subsubsection*{Public Member Functions}
\begin{DoxyCompactItemize}
\item 
\hyperlink{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_adbad459d440c34aa2288d5ce8736a079}{Gauss\-Tube} (\hyperlink{classvertex__lcfi_1_1Track}{Track} $\ast$\hyperlink{classvertex__lcfi_1_1Track}{Track})
\begin{DoxyCompactList}\small\item\em Construct from a \hyperlink{classvertex__lcfi_1_1Track}{Track}, makes a trackstate for its own use. \end{DoxyCompactList}\item 
\hypertarget{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_a19bb0d06483820b8900ad12ab03aa0a7}{\hyperlink{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_a19bb0d06483820b8900ad12ab03aa0a7}{$\sim$\-Gauss\-Tube} ()}\label{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_a19bb0d06483820b8900ad12ab03aa0a7}

\begin{DoxyCompactList}\small\item\em Delete tube and trackstate used. \end{DoxyCompactList}\item 
double \hyperlink{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_aad75d42e840d64061416000c853cde2b}{value\-At} (const \hyperlink{classvertex__lcfi_1_1util_1_1Vector3}{Vector3} \&Point) const 
\begin{DoxyCompactList}\small\item\em Calculate the value of the tube at point. \end{DoxyCompactList}\end{DoxyCompactItemize}


\subsubsection{Detailed Description}
Gaussian tube component of the vertex function. 

Gaussian Tube in detector space (usually representing a track) The track position and size are determined by the position and covariance matrix of a given \hyperlink{classvertex__lcfi_1_1Track}{Track} by\-: \[ V(\mathbf{r})=e^{-0.5rV^{-1}r^{T}} \] where r is the vector from to query point to the closest point on the track and V is the covariance matrix of the track. (Both in r\-Phi,z space) \par
Note this is a deliberatly unnormalised gaussian. \par
The \hyperlink{classvertex__lcfi_1_1Track}{Track} is not modified at any point by this class \par
This guassian tube makes its own trackstate object from the track given at construction which it uses to perform the calculation. \begin{DoxyAuthor}{Author}
Ben Jeffery (\href{mailto:b.jeffery1@physics.ox.ac.uk}{\tt b.\-jeffery1@physics.\-ox.\-ac.\-uk}) 
\end{DoxyAuthor}
\begin{DoxyVersion}{Version}
0.\-1 
\end{DoxyVersion}
\begin{DoxyDate}{Date}
20/09/05 
\end{DoxyDate}


\subsubsection{Constructor \& Destructor Documentation}
\hypertarget{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_adbad459d440c34aa2288d5ce8736a079}{\index{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube@{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube}!Gauss\-Tube@{Gauss\-Tube}}
\index{Gauss\-Tube@{Gauss\-Tube}!vertex_lcfi::ZVTOP::GaussTube@{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube}}
\paragraph[{Gauss\-Tube}]{\setlength{\rightskip}{0pt plus 5cm}vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube\-::\-Gauss\-Tube (
\begin{DoxyParamCaption}
\item[{{\bf Track} $\ast$}]{Track}
\end{DoxyParamCaption}
)}}\label{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_adbad459d440c34aa2288d5ce8736a079}


Construct from a \hyperlink{classvertex__lcfi_1_1Track}{Track}, makes a trackstate for its own use. 

As a trackstate is made from the track, note that any changes to the track will not propogate to the tube. 
\begin{DoxyParams}{Parameters}
{\em \hyperlink{classvertex__lcfi_1_1Track}{Track}} & \hyperlink{classvertex__lcfi_1_1Track}{Track} that forms the guassian tube \\
\hline
\end{DoxyParams}


\subsubsection{Member Function Documentation}
\hypertarget{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_aad75d42e840d64061416000c853cde2b}{\index{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube@{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube}!value\-At@{value\-At}}
\index{value\-At@{value\-At}!vertex_lcfi::ZVTOP::GaussTube@{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube}}
\paragraph[{value\-At}]{\setlength{\rightskip}{0pt plus 5cm}double vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Gauss\-Tube\-::value\-At (
\begin{DoxyParamCaption}
\item[{const {\bf Vector3} \&}]{Point}
\end{DoxyParamCaption}
) const\hspace{0.3cm}{\ttfamily [virtual]}}}\label{classvertex__lcfi_1_1ZVTOP_1_1GaussTube_aad75d42e840d64061416000c853cde2b}


Calculate the value of the tube at point. 

Swims the track to the point of closest approach and calculate the tube value. 
\begin{DoxyParams}{Parameters}
{\em Point} & Vector3 of the spacial point \\
\hline
\end{DoxyParams}
\begin{DoxyReturn}{Returns}
Value of tube at point 
\end{DoxyReturn}


Implements \hyperlink{classvertex__lcfi_1_1ZVTOP_1_1VertexFunctionElement}{vertex\-\_\-lcfi\-::\-Z\-V\-T\-O\-P\-::\-Vertex\-Function\-Element}.



The documentation for this class was generated from the following file\-:\begin{DoxyCompactItemize}
\item 
gausstube.\-h\end{DoxyCompactItemize}
