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.
Yours Michael
Quoting Bjorn H Samset <bjornhs@rcf.rhic.bnl.gov>:
>
> On Mon, 19 Mar 2001, Hironori Ito wrote:
>
> > However, if you still suspect the other detector is
>
> > the cause of this dependence, talk to Bjorn or someone who is working
> on
> > TPM1 vertex if TPM1 has any multiplicity dependence.
>
> Hi Hiro, Michael et al.
>
> I'm sorry it took a few days for me to get into this - I've been busy
> with
> some non-brahms stuff.
>
> I have not noticed any mult-dependent offset in the ZDC vertex or in
> the
> TPC vertex, but it has been a while since I really checked this. I have
> very recent trees with all the needed data, so I'll look into it
> sometime
> tomorrow. One thing to remember here, of the top of my head, is that
> because of the nature of the TPC vertex it will always bias your event
> sample towards higher multiplicities. While this should not affect the
> z
> position itself, it would perhaps emphasize any perviously unseen mult
> dependance.
>
> I'll get back to you on this tomorrow :-)
>
> ------------------------------------------------
> 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
>
>
Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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