As you may recall the ZDCs sum signals have been instrumented with Constant Craftion Discriminators to improve the online timing and possible use this in a level 2 trigger. Following the re-configuration of the hardware, I analyzed of of latest run from the previous night to checkout both the response of the CFD and issues on the trigger. The analysis of vertex determined as such is summarized on http://pii3.brahms.bnl.gov/~videbaek/ I hope the ZDC people will follow analyzing in detail the timing response from both the regular threshold discr, but also the CFD. The results are promising for using as a trigger, as well as for simple collision selection in analysis. ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov
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