[Brahms-l] Minutes of BRAHMS meeting

         Minutes of BRAHMS analysis meeting 26 January 2007
         ==================================================
                                                Michael Murray

Present JJ, Flemming, Ramero, Pawel, Dieter, Steve, Selemon, Dipali  
and Michael, Chris

http://indico.cern.ch/conferenceDisplay.py?confId=11693
09:30 	rich vs tof pid (20') Pawel Staszel
09:50 	net-proton yields study (20') 	Hongyan Yang (UiB)
comparisons


Action Items:
Please read Hongyan's draft for wording, Figures are fine so we can  
send in next week.

1) Pavel will work on electron contamination and on a fair  
comparisons of pion yields identified via rich and TOF2.

2) Hongyan will work on the wording of her proceedings.

3) Kris will present his net protons next week.

4) QM poster people will start to show what they want to show next week.


Next meeting 9.30am BNL time Friday 2nd February.
Pawel will give a detailed description of his analysis and we should  
have a first look at Quark matter poster contributions.




Muons and electrons in p+p @62GeV  P. Staszel
=============================================

For setting 4B608 p vs Rich radius show e, mu, pi, and k
He then makes slices in p and deduces yields of each slice.
Up to momentum ~4GeV one can separate pions and muons. The peaks  
merger around 5GeV.
FV most of the muons come from pion decay so we have included these  
muons pion yield.

He has compared yield of pions from TOF and RICH. At the moment there  
is a descrepency but he needs to include a cut requiring a CC vertex  
on the RICH results.
We expect that the CC vertex requirement should not have a momentum  
dependence. When comparing TOF to RICH we need to compare the same  
fiducial acceptance.

He worries about the distribution of tracks identified by TOF2 vs x  
in H2. There seem to be peaks in this distribution.
Flemming suggests that this is tracks hitting the corners of the  
slats that fire the trigger but do not satisfy the software cuts.

He is going to look into electron contamination on the pion signal.

Net-proton study, Hongyan Yang
==============================

She has looked at Phenix and Star proton spectra to see which
fit function, exponential or Boltzman,  to use. Since they don't have  
lot pt coverage several functions work. Using HiGing she finds  
Boltzman does better at low Pt but exponential in Pt does better at  
high Pt.
For QM proceeding Hongyan will show the range on dN/dy implied by the  
two different functions.

JJ low Pt looks like Boltzman, high Pt looks exponential.
FV: Are the Pythia plots non single diffractive or not.
They should be normalized to the total in-elastic cross section.  
Hongyan should also check this for Hijing B.
JJ thinks that the default for Hijing B is to include non-single  
diffractive events.

Note we have not corrected our data for lambda decay. By default weak  
decay is turned on in the models.


Chris is also working on net protons and thinks that he can have a  
comment by next week.

Any other buisness
==================
Flemming would like that each week someone give a detailed  
presentation of their analysis. QM will also publish posters.
All for posters should show what they want to publish their posters.


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