[Brahms-l] Minutes of BRAHMS Analysis Meeting Friday 09 2007

Minutes of BRAHMS Analysis Meeting Friday 09 2007
==================================================

Submitted by Michael Murray

http://indico.cern.ch/conferenceDisplay.py?confId=12287

Present: BNL: Chellis, FV, Ramero, JH
KU Steve, Dipali, Selemon, Michael,
Bergen: Hongyang,
TAMU Kris,
NBI Hans
and as special guest Eun-Joo Kim who is visiting Kansas.

Action Items:
1) Selemon will look put momentum cut into his acceptance corrections  
to account for the momentum cut used for RHIC PID.
2) Selemon will send out QM proceedings next Wednesday.
3) Collaboration will read Han's QM proceedings and Pawels note on  
statistics by next week
4) Kris will make a presentation of his pp work in next 2 weeks.




Agenda:
09:30 	pp results at 62 Gev for winterworkshop 	F.videbaek
This shows the new slides I intend to show at the big sky  
winterworkshop next week.
09:40 	QM2006 Proc., Identified particle spectra with RICH (20')     	 
SELEMON BEKELE (The University of Kansas)
10:00 	qm preceedin gs (20') ( Slides   )	
Hans dahlsgaard cont.
10:20 	spectra averaging (20') ( Slides    )	Pawel Staszel
10:40 	recent dau results (15') ( Slides    )	Hongyan Yang (UiB)
centrality cuts, comparison, problem

Kris working on pp run 5, he hopes to show something soon.

FV Nice aggreement with ISR results

Comparison of NLO pQCDcalculations (Vogelsang)
with BRAHMS pi+ data at y=0. Reasonable aggreement, disagrrement  
above 2GeV may be due to kaon contamination.
Calculation is for pi0, but pi+/pi0 ~1 with 5% in range
measured in calculations.
He does this comparison also at y=2.7 and y=3.3 and gets a  
supprsingly goood aggrement. Note 5 degree data at /s=52GeV shows a  
strong descrepency
JH asks how theory handles phase space limitation.

Note at y=2.7 (he thinks) p/pi is above 2 at pt=0.8 and it rises  
rapidly.


Selemon: QM Proceedings "Charged Hadron Spectra in CuCu at 200GeV at  
RHIC"
JH and FV suggests that he show less of the d-Au results which  
Selemon was using as an introduction. He will show spectra and Rcp  
for H+ and H- at 3 rapidities and for various centralities.
He has calibrated the RICH for all the CuCu settings. A few runs had  
some database problems for the magnetic field settings. Flemming has  
fixed this and Selemon will rerun the GTRs and DSTs. He has put plots  
on web page,
(Get this from selemon)

He can now get identified particle spectra
Track Cuts:-20 < VtxZ < 20
-14.32 < T5Yexit < 13.681 <= H2 slat <= 32
-20 < FS_fRichx < 20-15 < FS_fRichy < 15
momentum dependent ChiSq cut
PID Cut:Abs(R
meas–Rcal) < 3 sigmaR
meas–Rcal < 1 and RICH efficiency > 50%

For his PID he is effectively doing a momentum cut and this has to be  
matched in his acceptance maps.

Action Item: He will look into this

He has started to make anti-particle/particle ratios, more next week.
Action Item: QM proceeding due next Wednesday.


Hans: QM 06 proceedings, mainly plots he showed in his poster.  
Generally it looks good.


spectra averaging (20') ( Slides    )	Pawel Staszel
Action Item: Please read before next week when Pawel can be present.

Hongyan Yang: Recent dAu analysis using 3rd round of DSTs.
At y=0 she finds her spectra lower than Phenix and Star by a factor  
of 2, independent of centrality and particle type.
She wonders if this is due to the acceptence map. She is not sure  
about how to deal with the MRST0 detector.
FV says that we tried to ressurect early runs with only timing  
information
on inelastic counter.
There is another set of runs with lousy descriminators that have lots  
of cross talk. Trigger is fine but vertex is fine and for these runs  
you cannot use the inelastic counters for normalization. However a  
good fraction ~50% also have BB vertex and therefore one can use the  
double ratio of the BB/inelastic counter for good runs to do  
normalization.

At y=3 she gets good agreement with Ramiro.


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