¥The figures show the TOF
multiplicities for wall TB and wall TC.
The following requirements must be satisfied:
¥A good
pulse height in both top and bottom PMTs.
¥A
prompt time signals in both top and bottom PMTs.
¥Observations are similar
to those made by the SpecTrig group: the multiplicities for collision events
(red) are much lower than the multiplicities for beam-gas events (blue).