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

Hi, Djam,

Just to follow up my own question:

The main contribution for tracks from 
weak decays to deviate from an event vertex 
would be from a difference in angle between mother 
and daughter particles rather than the contribution 
from the uncertainty in reconstruction (+digitization).
I think what you have in your note should be fine for
the answer to the referee. I was mainly interested 
in how well our Monte-Carlo fake the data for FS.

JH  

  

> -----Original Message-----
> From: brahms-soft-l-bounces@lists.bnl.gov 
> [mailto:brahms-soft-l-bounces@lists.bnl.gov] On Behalf Of J.H. Lee
> Sent: Thursday, September 02, 2004 1:26 PM
> To: 'Djamel Ouerdane'; 'Brahms Software List'
> Subject: 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
> > |  Niels Bohr Institute      |  Home:                     |
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> > |                  http://www.nbi.dk/~ouerdane            |
> > |                  ouerdane@nbi.dk                        |
> > o---------------------------------------------------------o
> > 
> > 
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