On Fri, 1 Sep 2000, Michael Murray Tel 409 845 1411,FAX 1899, Home 823 3386 wrote: > Dear Bjorn, > I think that making dt = t_left - t_right is more logical since > it will be positive for positve Z. > Yours Michael Yes - this is what I have also landed on. What confused me was that BrRdoModuleBB uses right-left, but I have now been told by Yury that this module is obsolete and should not be used so I guess that clears it up. But I have another question for you and Andrei. In BrRdoModuleZDC you still have the timing-offset that I rather ad-hoc introduced this summer to get z=0 when doing z=(t_left-t_right)*c. Is this the correct value to use for this correction - i.e. should it be included in other software if I want to avoid using the rdo-module - and what is really the reason for the correction? I remember all the fuss about this just before I left BNL, but I thought that the reason then was the use of module 1 instead of the sum of all three times. BrRdoModule uses - as far as I can tell - the tdc-sum, and still needs the offset. So - what is the "correct" procedure for extracting z from the ZDC's? Ping from Norway :-) ------------------------------------------------ Bjorn H. Samset Master-student in Heavy Ion physics Mob: +47 92 05 19 98 Office: +47 22 85 77 62 Adr: Kri 2A709 Sognsveien 218 0864 Oslo
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