Thermal dilepton radiation at intermediate masses at the CERN-SpS

Ralf Rapp; Edward Shuryak

doi:10.1016/S0370-2693(99)01367-2

Thermal dilepton radiation at intermediate masses at the CERN-SpS

Ralf Rapp
, Edward Shuryak

Physics and Astronomy

Stony Brook University

Stony Brook University

Research output: Contribution to journal › Article › peer-review

99 Scopus citations

Abstract

We investigate the significance of thermal dilepton radiation in the intermediate-mass region in heavy-ion reactions at CERN-SpS energies. Within a thermal fireball model for the space-time evolution, the radiation from hot matter is found to dominate over hard 'background' processes (Drell-Yan and open charm) up to invariant masses of about 2 GeV, with a moderate fraction emerging from early stages with temperatures T ≃ 175-200 MeV associated with deconfined matter. Further including a schematic acceptance for the NA50 experiment we find good agreement with the observed enhancement in the region 1.5 GeV < M(μμ) < 3 GeV. In particular, there is no need to invoke any anomalous open charm enhancement. (C) 2000 Elsevier Science B.V.

Original language	English
Pages (from-to)	13-19
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	473
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(99)01367-2
State	Published - Jan 27 2000

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title = "Thermal dilepton radiation at intermediate masses at the CERN-SpS",

abstract = "We investigate the significance of thermal dilepton radiation in the intermediate-mass region in heavy-ion reactions at CERN-SpS energies. Within a thermal fireball model for the space-time evolution, the radiation from hot matter is found to dominate over hard 'background' processes (Drell-Yan and open charm) up to invariant masses of about 2 GeV, with a moderate fraction emerging from early stages with temperatures T ≃ 175-200 MeV associated with deconfined matter. Further including a schematic acceptance for the NA50 experiment we find good agreement with the observed enhancement in the region 1.5 GeV < M(μμ) < 3 GeV. In particular, there is no need to invoke any anomalous open charm enhancement. (C) 2000 Elsevier Science B.V.",

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AU - Shuryak, Edward

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N2 - We investigate the significance of thermal dilepton radiation in the intermediate-mass region in heavy-ion reactions at CERN-SpS energies. Within a thermal fireball model for the space-time evolution, the radiation from hot matter is found to dominate over hard 'background' processes (Drell-Yan and open charm) up to invariant masses of about 2 GeV, with a moderate fraction emerging from early stages with temperatures T ≃ 175-200 MeV associated with deconfined matter. Further including a schematic acceptance for the NA50 experiment we find good agreement with the observed enhancement in the region 1.5 GeV < M(μμ) < 3 GeV. In particular, there is no need to invoke any anomalous open charm enhancement. (C) 2000 Elsevier Science B.V.

AB - We investigate the significance of thermal dilepton radiation in the intermediate-mass region in heavy-ion reactions at CERN-SpS energies. Within a thermal fireball model for the space-time evolution, the radiation from hot matter is found to dominate over hard 'background' processes (Drell-Yan and open charm) up to invariant masses of about 2 GeV, with a moderate fraction emerging from early stages with temperatures T ≃ 175-200 MeV associated with deconfined matter. Further including a schematic acceptance for the NA50 experiment we find good agreement with the observed enhancement in the region 1.5 GeV < M(μμ) < 3 GeV. In particular, there is no need to invoke any anomalous open charm enhancement. (C) 2000 Elsevier Science B.V.

UR - https://www.scopus.com/pages/publications/0002358365

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

Thermal dilepton radiation at intermediate masses at the CERN-SpS

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