Re: ZDC slewing correction and efficiency???

From: Hironori Ito (hito@students.phsx.ukans.edu)
Date: Tue Jul 23 2002 - 13:46:20 EDT

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    	I guess since there is a large scale down for peripheral
collisions in those runs, the yields from the ZDC and BB should be almost
the same.  The yield of the ZDC vertex is not necessary a lot more than
that of the BB vertex, but it should be still more than that of the
BB vertex.  Therefore, the ZDC vertex still looks funny.

	Hiro

On Tue, 23 Jul 2002, Hironori Ito wrote:

> 	Hello.  While I happend to look at the ZDC and BB vertex today, I
> noticed the strange thing.  Somehow, the BB vertex has more events than
> the ZDC vertex.  Look at the file
> "http://pii3.brahms.bnl.gov/~hito/zdc/bb_zdc_vertex.gif". (I do not
> remember the exact run number, but it is somewhere around 5700.  I 
> just looked at the file in /brahms/data09/tracktree directory.  I
> did not make those files.  Hence, I do not know what parameters
> were used to make these files.  They must be standard parameters.)  Since
> the actual ZDC efficiency is better than that of the BB, it must be coming
> from the slewing correction.(???)  Anyway, people who are using this
> detector should be aware of this strange effect.  (or fix them.)
> 
> 
> 	Hiro
> 
>

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