[Brahms-l] Minutes 14 Aug 09

Minutes of BRAHMS Analysis meeting 14 August 2009
=================================================

Present: JH, Flemming, Ramiro, Pawel, Michael, Steve

Agenda and slides at:
http://indico.cern.ch/conferenceDisplay.py?confId=66268


09:30 	Comments on lambda corrections

For Pt>1GeV one can use a simple model to correct for the fraction of  
lambda's that we reconstruct.
The d2N/dpt spectrum in a Lambda decay is modified by changing
pT> mP/mL*pt. If T(L)=mL/mp*T(P) the correction is constant in pT.  
The branching ratio for the decay is .64 and we reconstruct 90% of  
the decay lambda's at mid-rapidity and 80% at forward rapidity.
Flemming can supply Casper with the incrediants to make these  
corrections.

This should allow us to make the primiary proton spectrum. For B2 we  
will assume that the primary neutron spectrum is the same as the  
primary protons.


V2: Steve
==========
Steve promises a V2 draft in the indefinite future.



P/Pi:
====
  Pawel needs comments on his p/pi paper.

d-A: Ramiro
===============
Ramiro is trying to check that his d-A yields are done correctly. (He  
had the difference between Hong Yan and PHENIX. He thinks the problem  
comes from the poor resolution of the inelastisity counters. This is  
causing problems for the vertex averaging. When he uses a good  
resolution counter (beam-beam) he aggrees with PHENIX. (Unfortunately  
they have a low efficiency).

Go back to the old idea from Flemming and Claus that was used for the  
R_dA paper. Basically he needs to deconvolute the the vertex  
distribution. Also when he fills his histogrammes he should simply  
project his tracks to the beam line and get a nominal Z from the  
track ignoring the inelasticity counters. JH suggested using a very  
lose cut on the difference between track vertex and inelasticity vertex.

JH plans to submit his DIS proceedings on polorized protons today. He  
plans to use this as a basis for a PRL or PR B paper. He will ask  
theorists for pt dependent single spin asymetries, in particular the  
pbar.

Michael and Steve have read Selemon's draft paper and will work with  
him on improving it.
Flemming thinks we can have a bunch of papers comming out soon, k/pi,  
p/pi, V2, B2, R_dA, CuCu,
The last one  should be a long paper on AuAu. It is not clear if it  
will include R_AA at forward raptidity.



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