RE: [Brahms-soft-l] feed down correction to pion spectra

Hi, Djam,

Nice work!

I have a quick question.
You mentioned that in your note that "I apply the same 
cuts I applied for the real data (vertex cuts, swim status, 
momentum status, matching stuff)".

Two main cuts to reduce background (not event related and 
not primaries) we are using in the analysis, namely 
the matching event vertex cut |z(BB)-z(track)| and 
the cut on delta_y of track projection at the beam.
How close the distributions from the simulations are to 
the real distributions from the data?  That's an important 
part of your estimates. If the distributions from simulations 
are much narrower than the real ones and you use the same cut 
values used for the real data, we are certainly underestimating 
the feed-down contributions. 

JH 
   


> -----Original Message-----
> From: brahms-soft-l-bounces@lists.bnl.gov 
> [mailto:brahms-soft-l-bounces@lists.bnl.gov] On Behalf Of 
> Djamel Ouerdane
> Sent: Thursday, September 02, 2004 12:47 PM
> To: Brahms Software List
> Subject: [Brahms-soft-l] feed down correction to pion spectra
> 
> 
> Hello,
> 
> I wrote a quick note on the lambda and K0s feed down 
> estimation, in reply 
> to the most serious paper referee comment. You can browse the 
> note here :
> 
> http://www.nbi.dk/~ouerdane/weakdecay
> 
> If you think the results are crazy or the whole thing does 
> not make sense, 
> tell me asap :)
> 
> The question is : do we want to change the numbers quoted in 
> nucl-ex/0403050 (the meson paper) ? I don't think it matters 
> that much but 
> the results I got are a bit crude and overestimated a little ...
> 
> Cheers!
> Djam 
> 
> 
> -- 
> Djamel Ouerdane ------------------------------------------o
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