Silicon Vertex Tracker:
5 layers of 2-sided microstrip detectors.
Of particular importance is the measurement of the distance between the decay vertexes of the two B mesons.

Drift Chamber:
Tracking and dE/dx.
40 concentric cylindrical layers, each made of thousands of drift cells.
Immersed in a 1.5 T solenoidal field.

Detector of Internally Reflected Cerenkov radiation:
Particle identification (see RICH).
Charged particles traverse quartz bars, generating Cerenkov radiation. The photons are transferred by total internal reflection (which preserves the angle) to a large water tank. The light is observed by an array of photomultiplier tubes at the outside of the tank.
The Cerenkov angle is determined from the photon position and the original track position.
The primary task of the DIRC is to distinguish between charged pions and charged kaons at high momentum. (At low momentum, pion/kaon separation is based on dE/dx measurements in the SVT and DCH.)
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The radiator is quartz.
An advantage of the DIRC for an asymmetric collider is that the high momentum tracks are boosted forward, which causes a much higher light yield than for particles at normal incidence. This is due to two effects: the longer path length in the quartz and a larger fraction of the produced light being internally reflected in the bar.
The tank is filled with water in order to have a good photon transmission from quartz at all angles.

Electromagnetic Calorimeter:
Its goal is to reconstruct photons (from B->π⁰+X decays) down to ~10 MeV.
To have good resolution on π⁰ mass, not only energy resolution but also position resolution has to be very good.
CsI(Tl) scintillator is used.
It has long decay time (~ μs) but this is not a problem since the rate is low (~100 Hz).
Energy resolution goes like 1/E^1/4.

Instrumented Flux Return:
Iron and steel as passive material, RPCs as active.