Re: [Brahms-dev-l] [Brahms-l] Minutes 30 April 2010

Hi
particular Casper and Michael.

I was bothered about the difference between the M**2 plots that Casper  
had and those that I had. So I revisited all the cuts done in the
analysis using my package (dst2spec). I looked at d5 fiducial, vertex  
cuts etc but found nothing, but as it turned out
the package did not apply a cut between projected track-Y and estimate  
hitY for up/down time. This make a large difference for a rare  
particle like the
deuteron, and removed fake background hits as we discussed Friday.  
Thus the correction factors need to be redone, and I will also  
generate a few spectra
with these new cuts. I think we can re-gain the anti-d at y~1.
Give me a few more days to re-do this completely.

F.




Flemming Videbaek
videbaek @ bnl.gov
Brookhaven National Lab
Physics Department
Bldg 510D
Upton, NY 11973

phone: 631-344-4106
cell     :  631-681-1596





On Apr 30, 2010, at 10:28 AM, Michael Murray wrote:

> Minutes of Brahms Analysis Meeting 30 April 2010
> ================================================
>
> Present: Michael, Kris, Pawel, JH, Ramiro, Steve, Flemming, Chellis
>
> Agenda:
> http://indico.cern.ch/conferenceDisplay.py?confId=90051
>
>
> dAu Figures: Ramiro
> ===================
>
> He is worried about contamination of the kaons at y=0, 1. (There is  
> a hump about pt=1.5) He also worried about the 8 degree data for  
> kaons and protons. He has made RdAu using Kris's pp data. He does  
> the contamination correction by adding all the settings at 90^o and  
> fitting by 3 Gaussian's in 1/beta - 1/beta_expected to get  
> correction factors.
>
> He has constructed RdAu and Rcp ratios and has pushed to as high Pt  
> as possible. For Rcp he has average pi+ and pi- 0-30% and used a fit  
> to the peripheral data, 60-80%. Finally he compares our spectra to  
> Star and PHENIX pi-0. The agreement looks very nice.
>
> He is preparing for a talk in 10 days and will concentrate on PID  
> for kaons and will carefully check the ratios near the highest Pt.  
> He may also make the RdA using the sum of pi+ and pi-.
>
>
>
> dp - New B2's: Casper
> =====================
> Casper has redone the B2 ratios with new binning and only taking  
> deutersona with Pt > 1.5 at both y=0 and y=1.
> Todo: >> Create the deuteron PID correction by linearly  
> interpolating Flemming's factors.
>
> At y=1 the contamination of the dbars is very strong so we shall  
> ignore these. There was a sense not to give dN/dy since we don't  
> have low enough Pt coverage.
>
> Todo >>> Casper will make new histogrammes that can be put into the  
> same plotting package.
>
> ==========   Submitted by Michael Murray =====================
>
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