Dear Bjorn,
the distribution looks as one might expect. We are
inefficent for low multiplicity events. Did you just use BB
triggers in your sample or also ZDC ones. I think it would be
better to analysis them as two separate data sets since the
ZDCs and BB counters will have different efficencies.
Anyway, keep up the good work. I have asked Zi-wei Lin
to give us "predictions" for this run. By the way I think we
should stop calling it 22GeV since in fact the momentum was
9.47. So I get sqrt{s_nn}=19GeV.
Yours Michael
> I've looked at the different responses of the global detectors using
> what
> calibrations I have (for run 4640, mostly), and the only one that looks
> more or less reasonable at first glance is the Si array hits:
>
> http://folk.uio.no/bjornhs/brahms/22GeV/SiArrayHits_22GeV.ps
>
> I use this response "blindly" to select "most central" events - if this
> is
> a very bad thing to do I'd appreciate some feedback.
>
> Again using the geant BB response (assuming 100% tube efficiency) to
> normalize the number of events, but now doing a much better job of the
> background subtraction:
>
> http://folk.uio.no/bjornhs/brahms/22GeV/dvf_z_fit.ps
>
> ...I get the following:
>
> dNdEta (eta=0) = 313
>
> Getting closer. There are still some parts of the TPC-specific code that
> I
> need to look into more closely, but I'd very much like to hear from
> Steve/Hiro on the Si response - is this curve usable the way I'm doing
> -
> i.e. just using the 200GeV calib blindly?
>
> Ping :-)
>
> --
> Bjorn H. Samset Phone: 22856465/92051998
> PhD student, heavy ion physics Adr: Schouterrassen 6
> Inst. of Physics, University of Oslo 0573 Oslo
> \|/
> ----------------------------> -*- <-----------------------------
> /|\
>
Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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