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Titolo:
SYSTEMATIC STUDY OF LOW-MASS ELECTRON-PAIR PRODUCTION IN P-BE AND P-AU COLLISIONS AT 450 GEV C/
Autore:
AGAKICHIEV G; APPENHEIMER M; AVERBECK R; BALLESTER F; BAUR R; BRENSCHEDE A; DIAZ J; DREES A; FASCHINGBAUER U; FERRERO JL; FISCHER P; FRAENKEL Z; FRANKE M; FUCHS C; GATTI E; GLASSEL P; GUNZEL T; DELOSHEROS CP; HESS F; HOLZMANN R; IOUREVITCH V; IRMSCHER D; JACOB C; KUHN W; LENKEIT B; LOHNER H; MARIN A; MARQUES FM; MARTINEZ G; METAG V; NOTHEISEN M; NOVOTNY R; OLSEN LH; OSTENDORF R; PANEBRATTSEV Y; PFEIFFER A; RAVINOVICH I; REHAK P; SAMPIETRO M; SCHON A; SCHUKRAFT J; SCHUTZ Y; SHIMANSKY S; SHOR A; SIMON RS; SPECHT HJ; STEINER V; TAPPROGGE S; TELZUR G; TSERRUYA I; ULLRICH T; WILSCHUT H; WURM JP;
Indirizzi:
MAX PLANCK INST KERNPHYS D-69117 HEIDELBERG GERMANY UNIV GIESSEN,INST PHYS 2 D-35392 GIESSEN GERMANY GSI DARMSTADT D-64220 DARMSTADT GERMANY INST FIS CORPUSCULAR E-46100 BURJASSOT VALENCIA SPAIN UNIV HEIDELBERG,INST PHYS D-69120 HEIDELBERG GERMANY WEIZMANN INST SCI IL-76100 REHOVOT ISRAEL POLITECN MILAN I-20133 MILAN ITALY CERN CH-1211 GENEVA 23 SWITZERLAND KERNFYS VERSNELLER INST NL-9747 AA GRONINGEN NETHERLANDS GANIL F-14021 CAEN FRANCE BROOKHAVEN NATL LAB UPTON NY 11973
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C-PARTICLES AND FIELDS
fascicolo: 2, volume: 4, anno: 1998,
pagine: 231 - 247
SICI:
1434-6044(1998)4:2<231:SSOLEP>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIRECT LEPTON PRODUCTION; D-MESON PRODUCTION; NUCLEUS COLLISIONS; PROTON-NUCLEUS; DEPENDENCE; PHYSICS; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
G. Agakichiev et al., "SYSTEMATIC STUDY OF LOW-MASS ELECTRON-PAIR PRODUCTION IN P-BE AND P-AU COLLISIONS AT 450 GEV C/", EUROPEAN PHYSICAL JOURNAL C-PARTICLES AND FIELDS, 4(2), 1998, pp. 231-247

Abstract

In a joint effort the CERES/NA45 and TAPS collaborations have measured low-mass electron pairs in p-Be and p-Au collisions at 450 GeV/c at the CERN SPS. In the range covered up to approximate to 1.5 GeV/c(2) the mass spectra from p-Be and p-Au collisions are well explained by electron pairs from decays of neutral mesons. For p-Au our result is new. For p-Be, the simultaneously measured electron pairs and photons served as a direct measure of the eta Dalitz decay contribution to the inclusive pair spectrum in which instrumental uncertainties are highly reduced. We confirm the earlier finding of HELIOS-1 with significantly reduced systematic uncertainties of 23% in the mass:range below 450 MeV/c(2), and of 28% in the mass range above 750 MeV/c(2) at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 09:45:11