D0  Experiment
Design Goals:           Identify  and measure well Leptons and Jets with
                        ~ 4p  solid angle  =>  -3.5  <  h  <  3.5 
                            for muons  and  hadrons
                        Control of missing Et  (id.  neutrinos)

Central Tracking        Vertex Drift Chamber:   s rj  =  35 to 80m
                    TRD:        Three chambers of 18m polypropylene
                    foils  +  Xe converter
chamber.   50 to 1                          rejection of p to e at 90%
efficiency.
                    Central Drift Chamber:  s rj  =  150 to 200m
                                        s z     =   2 mm
                    Forward Drift Chambers  s x,y =  200m

Calorimetry         Central & End Regions:  U/LAr or U/SS

                     Dh x Df  =  0.1  x 0.1 (0.05  x  0.05  EM shower max)

                    EM  20 X0   ~ 1X0     U  plates  (3 or 4 mm)
                        Longitudinal sampling:  2X0, 2X0,  7X0,  10X0
                        Resolution:  DE/E = 17%/CE

                    Had 7 to 9 l
                        Longitudinal sampling:  5 depth segments
                        Resolution:  DE/E = 45%/CE


Muons               Central & End Regions:  Magnetized Fe + 
                        Proportional Drift Tubes   5  or1.2  cm drift
                        DE/E  3  15% (forward)  25% (90o)

Trigger/DAQ         Hardware: Fast analog calor info digitized in
350ns, then
digital pipeline processors;
                        DAQ  via 50 nodes of mVAX IIIs.  (350 Mips)
                    Software:  Reduce rate from hardware level of 
                        200Hz to 2Hz;  250 ms to id jets, electrons,..

Physics Menu            Top Quark:  Leptons + jets search;  Mt < 130 GeV
   (~25pb-1)            W & Z:  Mz- Mw   ~200 MeV
                    QCD & New Part. :  QCD Evt shapes; SUSY search 
                    B Physics: sB vs. Pt; Rare decays, e.g.  Bo_>y + Ks