  Each  row in the {\it Particles} Table describes a  particle -- 
anti-particle pair. The rows consist of 10 fields:

\begin{itemize} 
\item[1.] {\it Full name} for a full name of particle. Just for clear orientation, not
processed  anywhere;

\item[2\&3.] {\it "A"} and  {\it "A+"}  containing designations of the particle and
anti-particle, respectively. Any character is allowed. The name 
may contain one symbol, two symbols or  three symbols 
started from '$\tilde{\;}$'.  For a completely neutral particle the
{\it "A"} and {\it "A+"} fields must be identical;

\item[4.] {\it 2*Spin} for a doubled particle spin: {\it 0} for scalar, {\it 1}
 for spinor  and {\it 2} for vector particles. Neutral spinor particle 
is teated as a Majorana one.

\item[5.] {\it Mass} for  a mass identifier or symbol '{\it 0}'. In the first case
its value must be defined in the {\it Parameters} or {\it Constraints} 
table.  If this field contains zero,
then \CompHEP~ considers this  particle as massless;

\item[6.] {\it Width} for a particle decay width. It must contain  an identifier defined 
in the first two tables  or '{\it 0}'; 

\item[7.] {\it Color} for a dimension of the color SU(3) group representation.  You have
to choose among {\it 1}, {\it 3}, {\it 8}. {\it Unity} corresponds to a colorless 
particle. {\it Three} corresponds to a color triplet (fundamental representation). 
In this case the anti-particle {\it "A+"} is transformed by conjugated $\bar{3}$
representation. {\it Eight} corresponds to a color octet (adjoint
representation);

\item[8.] {\it  Aux} for  an auxiliary  field which allows to modify  particle
propagators. If the {\it Aux} field is
empty the standard expressions for propagators are substituted:
\begin{enumerate}
   \item[(a)] spin 0 case:

      $$ <0|T[A(p_1) , A^+(p_2)]|0> = ScPr(p_1,p_2,M) = \frac{\delta(p_1 + p_2)}
{(2\pi)^4i(M^2 - p_1^2)}\;\;;$$


   \item[(b)]  spin 1/2 case:
 
      $$<0|T[A(p_1)  , A^+(p_2) \; \gamma_0  ]|0> =  (\not p_1 + M) \,
ScPr(p_1,p_2,M)\;\;,$$
      where 
       $$\not p = p^{\mu}\gamma_{\mu}\;\;.$$
      Here "$A^+$" is  the Hermitian conjugation of "$A$"; thus the
      Dirac $\gamma_0$ matrix is needed to make the Dirac conjugate
      field;

   \item[(c)]  spin 1 case:

      \begin{eqnarray}
      <0|T[A^{m_1}(p_1),  \; (A^{m_2})^+(p_2)]0> &=& -(g^{m_1 m_2} + p_1^{m_1} \; p_2^{m_2} / M^2)
\nonumber \\ &\times& ScPr(p_1,p_2,M)\;\;.
      \label{mvPropagator}
      \end{eqnarray}
                                          

      Zero mass vector particle must be marked as a {\it gauge} one using the
      {\it Aux} field (see below).
       
\end{enumerate}

Possible objects for the {\it Aux} field are:

\begin{itemize}
\item [{\it 'l','L'}] is permitted for massless fermions ( 2*spin = 1 ) only.
The propagator is changed  to

         $$\frac{  \not p_1  (1 + \gamma_5)}{2} \; ScPr(p_1,p_2,M)\;\;. $$

  This is a way to introduce a left-handed fermion as a neutrino or
a massless polarized fermion.  When \CompHEP~ performs the averaging
over incoming particle polarizations it takes into account that
there is only one polarization state;
   

\item [{\it 'r','R'}]  is permitted for massless fermion ( 2*spin=1 ) 
particle only.  They change the propagator for
                             
          $$ \frac{\not p_1  (1 - \gamma_5)}{2} \; ScPr(p_1,p_2,M)\;\;.$$

This is a way to introduce right-handed fermions;


\item [{\it '*'}] is permitted for massive particle only. In this case 
$ScPr(p_1,p_2,M)$ is replaced to  
$$ \frac{\delta(p_1+p_2)}{ (2 \pi)^4 i \;M^2}\;.$$
In the case of vector particle we also remove $p_1^{m1}p_2^{m2}$ 
term in the propagator  numerator (\ref{mvPropagator}). 
 
Such particles cannot appear as
incoming or outgoing  ones. They  are used to describe a point-like
interaction as one has in the electroweak 4-fermion interaction model;

\item [{\it 'G','g'}]  is permitted for vector ( 2*spin=2 ) particle. 
In this case the propagator of vector particle accepts the   
Feynman form

              $$ -g^{m_1m_2} \, ScPr(p_1,p_2,M)\;\;;$$


\end{itemize}       

\item[9\&10.] {\it LaTeX(A)} and {\it LaTeX(A+)} for 
particle and anti-particle designations in the \LaTeX~ format. They are 
substituted in the \LaTeX~ image of Feynman diagrams generated by \CompHEP.
The names are used in the mathematical mode.
\end{itemize}
