First results of the CERES electron pair spectrometer from p + Be, p + Au and S + Au collisions

doi:10.1016/0375-9474(94)90612-2

Nuclear Physics A

Volume 566, 3 January 1994, Pages 87-94

https://doi.org/10.1016/0375-9474(94)90612-2 Get rights and content

Abstract

The CERES experiment (CErenkov Ring Electron Spectrometer) studies the production of low mass e⁺e⁻ pairs in proton-proton, proton-nucleus and nucleus-nucleus interactions at the CERN SPS. The CERES spectrometer, has a novel design based on two Ring Imaging Cherenkov (RICH) counters, and it operates close to its design specifications. Data were recorded with 200 $GeV u$ sulfur beam and 450 GeV proton beam. The analysis is in progress. We have extracted first e⁺⁻-pairs samples for p+Be, p+Au and S+Au collisions. In addition other physics topics were addressed. Inclusive photon spectra were measured in S+Au interactions. No excess over known hadronic sources was found within our present systematic error of 11%. Results on high p_i charged pion spectra are presented up to 4 $GeV c$ . We also studied the production of e⁺e⁻-pairs m the strong electromagnetic fields of very peripheral S+Pt collisions. The data are well described by a first-order perturbative QED-calculation.

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¹: now at Universität Bonn, Germany.

²: now at Universität Mannheim, Germany.

³: now at DESY Hamburg, Germany.

⁴: now at Soreq Nuclear Research Center, Yavne, Israel.

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First results of the CERES electron pair spectrometer from p + Be, p + Au and S + Au collisions

Abstract

Nucl. Instr. Meth.

IEEE Trans. Nucl. Sci. NS-39

Nucl. Instr. Meth.