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HK: Hadronen und Kerne

HK 12: Heavy Ion Reactions II, Ultrarelativistic Energies

HK 12.2: Vortrag

Montag, 16. März 1998, 17:30–17:45, P

Hadron physics with CERES — •F. Ceretto for the CERES Collaboration — Physikalisches Institut, Universit"at Heidelberg,
Philosophenweg 12, D-69120 Heidelberg

Using the CERES/NA45 Spectrometer, we have measured charged hadron spectra to provide information on the collective behavior of the hot fireball produced in Pb-Au collisions at 158 GeV/c per nucleon.
The apparatus, designed to measure e⁺e⁻ pairs, consists of two radial Si Drift Chamber SiDC near the target, two RICH Detectors, one before and the other after the magnetic field, and a pad chamber downstream of the second RICH. The full experimental setup can be used to track and identify π⁺ as well as π⁻, if their momenta are above the Cherenkov threshold, and cover the p_⊥ range 1-4 GeV/c. Lower momentum particles cannot be identified but the momenta are measured using the deflection between the SiDC and the pad chamber. On a statistical basis we are able to extract distributions for negative hadrons and by subtracting the distribution of negative from those of positive particles, spectra closely correlated with the proton distribution up to 2 GeV/c. All spectra have been measured near mid-rapidity over a wide range of centrality.