Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Physik mit schweren Ionen
HK 13.4: Talk
Monday, March 10, 2008, 17:30–17:45, 2E
Direct Photons and Neutral-Pions from p+C-, p+Pb- and Pb+Pb-Collisions at √sNN = 17.3 GeV — •Markus Rammler, Christoph Baumann und Klaus Reygers für die WA98 Kollaboration — Institut für Kernphysik, 48149 Münster
The WA98 experiment has measured the
production of direct photons and neutral-pions in central Pb+Pb collisions at
√sNN = 17.3 GeV [1][2].
In order to interpret the Pb+Pb data p+A reference spectra
measured at the same energy are useful.
From the Pb+Pb photon data the initial temperature could be constrained to values between 200 and 400 MeV.
The spread of these temperatures is due to the uncertainty of the relative amount by which photons from hard scattering processes and thermally produced photons contribute to the photon excess. The status of the analysis of direct photon production in p+Pb collisions at √sNN = 17.3 GeV measured with the WA98 experiment will be presented and
implications for the different production mechanisms in Pb+Pb collisions are discussed.
Moreover, the neutral-pion supression measured in Pb+Pb by using the p+C and p+Pb spectra as references will be presented as
a function of the centrality of the collision.
WA98 Collaboration,
Phys.Rev.Lett 85, 3595, 2000
WA98 Collaboration, Eur.Phys.J.C
23, 225-236, 2002