Re: [Brahms-l] 63 AGeV results

Hi Ionut,

A few comments:
If it is possible I would make a 0-5% sample, becuase it is well known 
that theorists (ok, most people) only remember values for this centrality 
class.

I think that for a fixed centrality class dN/dy \propto s^(0.25) (Landau)  
so that you would expect the yields to be sqrt(63.0/200.0)~0.56 times the
200 GeV yields. We published ca. dN/dy(y=0)=290 pions and dN/dy(y=0)=180
kaons, so I would expect your yields to be roughly 160 and 100. The fit to
the dN/dy curves should be done with Gaussians with fixed mean (0) or at
least be symmetrical in y (K+ looks strange). There you could compare the
width to the Landau estimate: sigma^2 = ln (gamma_beam).

If I were you I would focus on 1 specie e.g. pions where statistic is not 
a problem. Then I would cut down on centrality classes and do maybe 0-5% 
and 30-40%. 

About pions:  As Flemming writes more details are needed, but what is a
great idea (and not so difficults) is to make a plot of the yield in the
acceptance range which should be damn close for pi+ and pi- (if you use
the same range) and then the extrapolated yield from the fit, so that you
can see the acceptance coverage. It is fx. clear that your fits don't have
the same shape for pion spectra which is usually the case (both as a
function of rapidity and centrality). 

I think there is a really good story with the pion yields alone..... 

Cheers,
   Peter

P.s: I'm really looking forward to the final net-proton spectra!!!!!

On Fri, 18 Mar 2005, Ionut Christian Arsene wrote:

> 
>      Hi all,
> 
>    I obtained some results from the Au+Au 63 AGeV data run. A part of the
> graphs are posted at the following address:
>   http://www4.rcf.bnl.gov/~aic/.
> In the next days I will update the page with new plots.
>    I would like to present these results at the workshop that will take
> place in Bergen at the end of this month, so I will appreciate your
> comments and sugestions about these results.
> 
>              Regards,
>                 Ionut
> 
> 
> _______________________________________________
> Brahms-l mailing list
> Brahms-l@lists.bnl.gov
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> 

-- 
:-) --------------------------- )-:
 Peter H L Christiansen
 pchristi@nbi.dk / (+41)764870425
:-D --------------------------- \-:



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