Triggering on Collisions & Centrality
Negative Paddles
Positive Paddles
Au
Au
PP
PN
Positive ZDC
Negative ZDC
Negative Cerenkov
Positive Cerenkov
Paddle signal (a.u.)
ZDC Signal (a.u.)
Npart
Nspectator=2A-Npart
Central
Peripheral
200 GeV Data
Coincidence between Paddle counters at Dt = 0 defines a valid collision
Paddle + ZDC timing reject background
Trigger sensitive to 97% of inelastic cross section
Measurement
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