[Brahms-l] Brahms minutes 11 Sept 09

Minutes of BRAHMS Analysis Meeting Friday 11 September 2009
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Agenda
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http://indico.cern.ch/conferenceDisplay.py?confId=68071
09:30 	Some items that might be useful for p + p stopping Kris
09:50   d/p paper Casper Nygaard

Present: Casper, Michael, Kris, JH, Flemming, Ramiro and Kris.


Some items that might be useful for p + p stopping Kris
=======================================================
There was an assertion in recent emails that by strangeness conservation
K+-K- = Lambda - Lambdabar
His net kaons are significantly higher than net lambda. (Note his  
kaon spectra are quite close to ours.).
Flemming commented that the net kaon yield does rise slowly with  
rapidity as one would expect.

Todo >>> Recreate net kaon and net lambda distributions from Pythia  
and compare to data. (It would also be worth integrating net kaon)  
This should be smaller than net proton and would give us an estimate  
of net lambda.


Kris also looked at converting dN/dxf to dN/dy. He did it himself  
(using Jacobian) and compared to how they did it (2d grid). This  
worked very well except perhaps at y>2. The hope was to take dN/dy  
data from NA49 at 3 energies and compare it to ours and see if we can  
understand the stopping mechanism. This can be done by transforming  
the dN/dX distribution to our higher energy by multiplying by 100GeV  
and then converting back to dN/dy


d/p paper Casper Nygaard
========================
Casper has constructed the lambda correction
  C= 1 / (1 + eff*c1*(lambda/p) + c2*(sigma/p))
  C= 1 / (1 + eff*c1*(lambda/p) +
c2*(sigma/lambda)*(lambda/p))
Sigma/lambda gotten from other experiments and thermal models.

There was a misunderstanding of the data that Flemming supplied since  
it already had the branching ratio and 80% MRS efficiency included  
but it assumed that lambda/p=1.

AOB
=============
Ramiro is doing extensive work on the p/pi text. Abstract is almost  
done but it is hard to formulate what to say about time scales.  
Flemming has uploaded his corrected QM09 text and Steve and Pawel  
will do this soon.



==============  Submitted by Michael Murray ==========================



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