Hi Michael, Jens Jorgen and others,
On Wed, 21 Nov 2001, Michael Murray wrote:
> the Hard/soft scaling equation we use is
> incorrect and clearly in contradiction to Fig 5.
> Thus I think that we should write
> dN Npart
> -- = alpha * ----- + Beta * Ncoll
> dEta 2
> I think this is what Trine fitted to.
> It is also clear that the errors on alpha and beta are
> anticorrelated since the total value of dN/dEta is fixed.
> Therefore I suggest that we use +- for the errors on alpha
> and -+ for the errors on beta.
You're absolutely right, Michael - thanks for being so observant!
The equation I actually fitted to was:
dN
-- = alpha * Npart + Beta * Ncoll
dEta
(like Phenix did in Adcox, PRL 86) but it's trivial to transform to the
Npart/2 dependence by scaling alpha+-errors up with a factor of 2. Which
form of the equation should we use in the paper?
Also alpha and beta errors are truly anticorrelated - they should be
+- and -+ (think I quoted the errors that way - but it's very hard to
overlook! :-))
Cheers,
Trine
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