The trigger mask is a simple yes/no gate over detector channels. In this pinned example, 6 of 8 channels are enabled, the candidate lands on an enabled channel, and no veto is present, so the accepted bit stays on. Real triggers also depend on thresholds, timing windows, noisy channels, dead regions, calibration, and finite-event uncertainty.
An enabled candidate with no veto is accepted. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
An enabled candidate can pass the mask
The detector has 8 channels, with 6 enabled. The candidate channel is enabled.
Ntotal=8,Non=6
No veto leaves the accepted bit on
Candidate enabled is 1, veto is 0, so accepted is 1.