Hi Claus, great plots! I think the last plot may turn out to be the most interesting for BRAHMS and we should put all the focus on it. My first reaction to the fact that the ratio is constant would be that at those rapidities the shapes of the distributions can be "factorized" as a product or a convolution of individual partons going through the Yellow beam ions . So all distributions have similar shape but the ratios would change as the very central sample is compared to more and more peripheral ones. Can you make similar ratios with other centrality samples? Ramiro On Thursday, July 4, 2002, at 08:31 PM, Claus O. E. Jorgensen wrote: > > I've made some preliminary plots for my qm2002 talk. You can find them > here: > > http://www.nbi.dk/~ekman/highpt/highpt.html > > The main physics plots will be > > - (h++h-)/2 pt spectra for 0-5, 5-10, 10-20 and ~40-60% centrality at > eta=0. > > - pt ratio (R) of central (0-10) to semi-peripheral (~40-60). Here I > conlude that we our measurements indicate a suppression of high pt > particles when comparing central to semi-peripheral collisions - this > comparison is of course independent on fit ranges and reference data > taken with another experiment. > > - ratios of spectra to p+pbar reference (ua1) data. These ratios are > dependent on the choice of reference data and fit ranges/methods. > However, suppression of high pt hadrons is observed and it is more > pronounced for the central collisions. > > - ratios of protons to all hadrons as function of pt. Mesonic vs. > baryonic > jets??? Who knows about this stuff? Is my result reasonalbe (I just > pulled out the numbers)? > > - pi- spectrum at y approx 2.2 for 0-15% central. The statistics are > unfortunately not good enough to make qualitative statements on the > slope at high pt. > > - pi- pt ratios of central (0-10) to semi-peripheral (~40-60). The ratio > constant (within the erros). What do we expect at forward rapidities? > > > Comments and suggestions are very welcome... > > Cheers, > > Claus > > > +-------------------------------------------------------------+ > | Claus Jørgensen | > | Cand. Scient. Phone : (+45) 33 32 49 49 | > | Cell : (+45) 27 28 49 49 | > | Niels Bohr Institute, Ta-2, Office : (+45) 35 32 53 07 | > | Blegdamsvej 17, DK-2100, E-mail : ekman@nbi.dk | > | University of Copenhagen Home : www.nbi.dk/~ekman/ | > +-------------------------------------------------------------+ >
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