Re: FAQ's for pbar/p ratio analysis (MRS)

From: J.H. Lee (jhlee@sgs1.hirg.bnl.goV)
Date: Fri Apr 06 2001 - 10:03:57 EDT

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    Dear Michael,

The distributions for the matching parameters shown in the "FAQ's  
are obviously before matching cuts in each projections. When all 
three matching conditions are applied (angle in x and y, and delta y)  
there will not be much background left. Also when you take particle 
ratios, we assume the two "signal to the left-over background" ratios 
for positive particles from A polarity and for negative particles from 
B polarity cancel out.  In other words, I don't correct for the 
background in the ratio.

JH

 
----- Original Message ----- 
From: "Michael Murray" <murray@cyclotronmail.tamu.edu>
To: <brahms-l@bnl.gov>
Sent: Friday, April 06, 2001 9:25 AM
Subject: Re: FAQ's for pbar/p ratio analysis (MRS)


>    Dear J.H.,
>            that was a lovely report. The 
> distributions of matching parameters such as yang
> look like they have been fitted to a gaussian plus
> a quadratic background. Do you correct for the
> background in the ratios?
>                Yours Michael
> 
> Quoting "J.H. Lee" <jhlee@sgs1.hirg.bnl.gov>:
> 
> > Dear Collaborators,
> > 
> > Please find some background information on the MRS analysis 
> > for the pbar/p ratio paper in  
> > http://pii3.brahms.bnl.gov/~jhlee/brahms/analysis/mrs/mrs_ratio.html .
> > The password is same as the BRAHMS private page.
> > 
> > Regards, JH
> > 
> 
> 
> 
> Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
>

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