New results on Pb-Au collisions at 40 AGeV from CERES/NA45 experiment

Kirill Filimonov, LBNL

for the CERES/NA45 Collaboration

Introduction

Experimental Setup

Leptonic Observables: e⁺e^--pair analysis

Hadronic Observables

Summary and outlook

Electromagnetic probes of nuclear collisions

Mean free path larger than reaction volume

Dileptons emitted at all stages of the collision:

neutral meson decays

p⁺p^- annihilation

qq annihilation

Drell-Yan pairs

Summary and outlook

e⁺e^--pair analysis of 40 AGeV data shows similar enhancement observed at 158 AGeV. Both agree with present theoretical descriptions.

Hadron data at 40 AGeV are very useful for studying beam energy systematics of hadronic observables

2000 run data on tape:

- 33M central Pb-Au events at 158 AGeV

- high resolution spectroscopy of r/w/f ® e⁺e^-

- wealth of hadron data, including f ® K⁺K^-


	Kirill Filimonov, LBNL
	for the CERES/NA45 Collaboration


			Introduction
			Experimental Setup
			Leptonic Observables: e⁺e^--pair analysis
			Hadronic Observables
			Summary and outlook


	Mean free path larger than reaction volume
	Dileptons emitted at all stages of the collision:
		neutral meson decays
		p⁺p^- annihilation
		qq annihilation
		Drell-Yan pairs


	e⁺e^--pair analysis of 40 AGeV data shows similar enhancement observed at 158 AGeV. Both agree with present theoretical descriptions.
	Hadron data at 40 AGeV are very useful for studying beam energy systematics of hadronic observables

	2000 run data on tape:
	- 33M central Pb-Au events at 158 AGeV
	- high resolution spectroscopy of r/w/f ® e⁺e^-
	- wealth of hadron data, including f ® K⁺K^-