Re: [Brahms-l] pi,K,p rapidity systematic at 200 GeV

Hi Djamel,
Thanks for the plot.
I guess that you got 4.95 using tau=1fm/c in the Bjorken formula.
My estimate from the dNch/deta was ~4 but I assumed <Et>=0.5GeV.
Because you took proper <Et(Mt)> for kaons and protons which are 
significantly larger than 0.5
it seems that your result is very reasonably.

Cheers
Pawel.

Djamel Ouerdane wrote:

>Hello,
>
>Among other things, I'm making some plots for the white paper. I thought 
>it would be nice to have the rapidity systematic of our pi, K, and p data 
>in one figure. I produced such a plot, which shows dN/dy, mean Mt and mean 
>Et.
>
>I also made a quick estimation of the Bjorken energy density at mid-rap, 
>given the mean Mt of each particle type (I've applied a factor of 1.5 for 
>pions (pi0), 2 for kaons (K0s) and 2 for p and pbars, rough neutron 
>estimation). I end up with epsilon = 4.95 GeV/fm3, not bad :)
>
>You can find plots here:
>
>http://www.nbi.dk/~ouerdane/ysyst/rapSystematic.gif
>http://www.nbi.dk/~ouerdane/ysyst/rapSystematic.eps
>http://www.nbi.dk/~ouerdane/ysyst/rapSystematic.ps
>
>The mean mt data can be found here:
>
>http://www.nbi.dk/~ouerdane/ysyst/mmt.dat
>
>Ciao
>Djam
>
>
>
>  
>



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