\def \Bskip {\vskip 1cm}
\def \bskip {\vskip 0.75cm}
\def \Mskip {\vskip 0.5cm}
\def \ssk {\vskip 0.2cm}
\def \hb {\hfill\break }
\def\ul#1{$\underline{\hbox{#1}}$}
\def\rr{\hbox{\vrule height 3pt depth-2pt width.5cm}} 
%
% some defs from physics_defs:
%
\def\ie{{\it i.e.}, }
\def \viz{ {\it viz. }}
\def \eg{{\it e.g.},}
\def \DZ {D\O ~}
\def \dz {D\O }
\def \DN {D\O Note~}
\def \DG {D\O GEANT~}
\def \Lum {{\cal L}}
\def \Bul {~~$\bullet $~}
\def \pbarp {$\overline{\rm p} {\rm p}$}
\def\ppbar{${\rm p}\overline{\rm p} $}
\def \Lum {{\cal L}}\def\squark{$\widetilde q$}             %squark
\def\gluino{$\widetilde g$}             %gluino
\def\MEt{/\kern-.75em\hbox{$E_t$}}
%\def\Missing#1#2{${\mbox{#1\kern-0.57em\raise0.19ex\hbox{/}_{#2}}}$}
%\def\MEt{\Missing{E}{T}}
%\def\MEt{\mbox{${\hbox{$E$\kern-0.6em\lower-.1ex\hbox{/}}}_T$ }} %missing ET
%\def\MEt{$\not\!\!E_T$}
%\def\MEt{$E_T\!\not$}
%
%
\def \Deg {$^{\circ} $}
\def \Lsim {$ \sim$\llap {$^<$}}
\def \Gsim {$ \sim$\llap {$^>$}}
\def \ang {$^{\circ }$\llap A }  
%
\def\Ang{
\setbox0=\hbox{h}\dimen1=\ht0 \advance\dimen1 by-1ex
\rlap{\raise.67\dimen1\hbox{{}\hskip2pt\char'27}}A}
%(this def. of \Ang from gendoc.tex)
%
\def \Bul {\ifmmode {\bullet }\else {$\bullet $\enskip}\fi}
\def \Ebul {\ifmmode {\circ }\else {$\circ $\enskip}\fi}
\def \imply {\ifmmode {\Rightarrow }\else {$\Rightarrow $}\fi}
%
\def \lt {<}
\def \gt {>}

