¥The lack of prompt T0s
for collision events has a number of consequences:
¥The T0
vertex resolution does not improve when the multiplicity of the event
increases.
¥The
collision time resolution does not improve when the multiplicity of the event
increases.
¥The
only approach we can take in selecting the prompt T0 counter is to take the
first T0 counter that fires in a particular event.
¥The
expected collision time resolution for prompt T0 counters is 75 ps. But É. Contribution of non-prompt hits
must be take into consideration.