Hello. The figure includes any events which ZDC and TPM1 cluster vertex exist. (I have to have TPM1 since that is what I am comparing with.) There is no additional cuts. Unless the TPM1 cluster vertex has multiplicity dependence, which I have not heard such a dependence, it is coming from ZDC vertex. Maybe, the slewing correction is not quite right??? Hiro On Mon, 19 Mar 2001, Michael Murray wrote: > Dear Hiro, > I guess that the figure was made only > for events in which the BB and the TPM1 vertex > failed. If so the effect you see could be induced > by an (multiplicity dependent) > inefficency in the vertex algorithm of > these detectors. Could you please remake the > same plot for an unbiased sample of events from > the same run. Ideally that would be just ZDC triggers. > Yours Michael > > Quoting Hironori Ito <hito@students.phsx.ukans.edu>: > > > Well. I have another thought about fixing manually. I can not > > fix manually since I only use ZDC vertex when I do not have good vertex > > from BB or TPM1. This means that I can not fix ZDC since I do not have > > any other reference to fix ZDC Vertex. > > > > hiro > > > > On Fri, 16 Mar 2001, Hironori Ito wrote: > > > > > Hello. I have a question. I remember reading the e-mail about > > > ZDC_Vertex do not have Multiplicity dependence. Well, I think it is > > > there. Look at the figure "ZDC_TPM1_vertex.ps" in > > > "http://pii3.brahms.bnl.gov/~hito". The figure is produced from > > > run 2336. In this figure, the vertical scale is > > > ZDC vertex - TPM1 (cluster) vertex, and the horizontal scale is BB > > > Mult. Of cause, it is possible that BB Mult is wrong. But, if I use > > > other mult such as Si and Tile mult, I see the same thing. > > Furthermore, I > > > do not see this much dependence from BBVertex - TPM1 Vertex although > > > BBVertex have other problem. Can someone look at this? The fix is > > > needed since multiplicity in Si can easily is affected by 3-4 cm shift > > of > > > vertex. Until it is fixed, I will manually (in my own code) fix > > ZDCVertex > > > to align to TPM1 vertex. > > > > > > Hiro > > > > > > > > > > > > Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899 >
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