On Tue, 20 Mar 2001, Michael Murray wrote: > Dear Bjorn, > although the Z vertex distirbution is very > wide if we have enough events it should be possible to find > a well defined mean z for the the ZDC and TPM1. Thus a profile > plot, with option ' ' for error on mean, of Z versus multiplicity > would be useful. Thanks for helping on this. My pleasure :-) I have made a few quick plots - have a look at www.fys.uio.no/~bjornhs/ZDCvsTPM1_profile.ps www.fys.uio.no/~bjornhs/ZDCvsTPM1_DiffVsMult.ps The first one is simply ZDC vs TPM1 showing a nice linear rel. over at least z=pm35cm. The second one is more interesting - as requested, a profile of Z_ZDC-Z_TPM1 vs multiplicity (I have used BB_Mult because that was easiest from my tree - if you think that this causes a problem I can redo for some other mult-version). As you can see there really seems to be a mult-dependence on the difference - it is well fitted by a 2nd order poly. As of yet I have no ide as to the reason for this - I'll have a more thorough look at the TPM1 Vertex output to see if there is anything there that might cause problems, otherwise I guess slewing corrections are a good place to start. My data are from runs 2529, 2530, 2531, 2535. I'll check this better during the day... Ping :-) ------------------------------------------------ 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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