Collision time and vertex resolution.
¥Obtaining
the T0 time:
¥Use
the fastest signal on either side.
This will produce a multiplicity-dependent systematic shift towards
shorter times.
¥Use
the average time of all T0 signals on either side. PMTs with large signals will induce a systematic shift
towards longer times.
¥Use
the average time of all T0 counters that fire within 250 - 500 ps of the
fastest one.
¥Use
the average of the largest number of
T0 counters that fire within 250 - 500 ps of the each other.