Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

G. Agakichiev; M. Appenheimer; R. Averbeck; F. Ballester; R. Baur; A. Brenschede; J. Diaz; A. Drees; U. Faschingbauer; J. L. Ferrero; P. Fischer; Z. Fraenkel; M. Franke; Ch Fuchs; E. Gatti; P. Glässel; Th Günzel; C. P. De Los Heros; F. Hess; R. Holzmann; V. Iourevitch; D. Irmscher; C. Jacob; W. Kühn; B. Lenkeit; H. Löhner; A. Marin; F. M. Marques; G. Martinez; V. Metag; M. Notheisen; R. Novotny; L. H. Olsen; R. Ostendorf; Y. Panebrattsev; A. Pfeiffer; I. Ravinovich; P. Rehak; M. Sampietro; A. Schön; J. Schukraft; Y. Schutz; S. Shimansky; A. Shor; R. S. Simon; H. J. Specht; V. Steiner; S. Tapprogge; G. Tel-Zur; I. Tserruya; Th Ullrich; H. Wilschut; J. P. Wurm

doi:10.1007/PL00021659

Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

G. Agakichiev
, M. Appenheimer
, R. Averbeck
, F. Ballester
, R. Baur
, A. Brenschede
, J. Diaz
, A. Drees
, U. Faschingbauer
, J. L. Ferrero
, P. Fischer
, Z. Fraenkel
, M. Franke
, Ch Fuchs
, E. Gatti
, P. Glässel
, Th Günzel
, C. P. De Los Heros
, F. Hess
, R. Holzmann

V. Iourevitch, D. Irmscher, C. Jacob, W. Kühn, B. Lenkeit, H. Löhner, A. Marin, F. M. Marques, G. Martinez, V. Metag, M. Notheisen, R. Novotny, L. H. Olsen, R. Ostendorf, Y. Panebrattsev, A. Pfeiffer, I. Ravinovich, P. Rehak, M. Sampietro, A. Schön, J. Schukraft, Y. Schutz, S. Shimansky, A. Shor, R. S. Simon, H. J. Specht, V. Steiner, S. Tapprogge, G. Tel-Zur, I. Tserruya, Th Ullrich, H. Wilschut, J. P. Wurm

Physics and Astronomy

Stony Brook University

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

69 Scopus citations

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 ≈ 1.5 GeV/c² 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 η 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/c², and of 28% in the mass range above 750 MeV/c² at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.

Original language	English
Pages (from-to)	231-247
Number of pages	17
Journal	European Physical Journal C
Volume	4
Issue number	2
DOIs	https://doi.org/10.1007/PL00021659
State	Published - 1998

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10.1007/PL00021659

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Agakichiev, G., Appenheimer, M., Averbeck, R., Ballester, F., Baur, R., Brenschede, A., Diaz, J., Drees, A., Faschingbauer, U., Ferrero, J. L., Fischer, P., Fraenkel, Z., Franke, M., Fuchs, C., Gatti, E., Glässel, P., Günzel, T., De Los Heros, C. P., Hess, F., ... Wurm, J. P. (1998). Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c. European Physical Journal C, 4(2), 231-247. https://doi.org/10.1007/PL00021659

@article{8ca2ea3dddab481489a111f73e79e935,

title = "Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c",

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 ≈ 1.5 GeV/c2 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 η 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/c2, and of 28\% in the mass range above 750 MeV/c2 at 90\% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.",

author = "G. Agakichiev and M. Appenheimer and R. Averbeck and F. Ballester and R. Baur and A. Brenschede and J. Diaz and A. Drees and U. Faschingbauer and Ferrero, \{J. L.\} and P. Fischer and Z. Fraenkel and M. Franke and Ch Fuchs and E. Gatti and P. Gl{\"a}ssel and Th G{\"u}nzel and \{De Los Heros\}, \{C. P.\} and F. Hess and R. Holzmann and V. Iourevitch and D. Irmscher and C. Jacob and W. K{\"u}hn and B. Lenkeit and H. L{\"o}hner and A. Marin and Marques, \{F. M.\} and G. Martinez and V. Metag and M. Notheisen and R. Novotny and Olsen, \{L. H.\} and R. Ostendorf and Y. Panebrattsev and A. Pfeiffer and I. Ravinovich and P. Rehak and M. Sampietro and A. Sch{\"o}n and J. Schukraft and Y. Schutz and S. Shimansky and A. Shor and Simon, \{R. S.\} and Specht, \{H. J.\} and V. Steiner and S. Tapprogge and G. Tel-Zur and I. Tserruya and Th Ullrich and H. Wilschut and Wurm, \{J. P.\}",

year = "1998",

doi = "10.1007/PL00021659",

language = "English",

volume = "4",

pages = "231--247",

journal = "European Physical Journal C",

issn = "1434-6044",

number = "2",

}

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, Glässel, P, Günzel, T, De Los Heros, CP, Hess, F, Holzmann, R, Iourevitch, V, Irmscher, D, Jacob, C, Kühn, W, Lenkeit, B, Löhner, 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, Schön, A, Schukraft, J, Schutz, Y, Shimansky, S, Shor, A, Simon, RS, Specht, HJ, Steiner, V, Tapprogge, S, Tel-Zur, G, Tserruya, I, Ullrich, T, Wilschut, H & Wurm, JP 1998, 'Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c', European Physical Journal C, vol. 4, no. 2, pp. 231-247. https://doi.org/10.1007/PL00021659

TY - JOUR

T1 - Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

AU - Agakichiev, G.

AU - Appenheimer, M.

AU - Averbeck, R.

AU - Ballester, F.

AU - Baur, R.

AU - Brenschede, A.

AU - Diaz, J.

AU - Drees, A.

AU - Faschingbauer, U.

AU - Ferrero, J. L.

AU - Fischer, P.

AU - Fraenkel, Z.

AU - Franke, M.

AU - Fuchs, Ch

AU - Gatti, E.

AU - Glässel, P.

AU - Günzel, Th

AU - De Los Heros, C. P.

AU - Hess, F.

AU - Holzmann, R.

AU - Iourevitch, V.

AU - Irmscher, D.

AU - Jacob, C.

AU - Kühn, W.

AU - Lenkeit, B.

AU - Löhner, H.

AU - Marin, A.

AU - Marques, F. M.

AU - Martinez, G.

AU - Metag, V.

AU - Notheisen, M.

AU - Novotny, R.

AU - Olsen, L. H.

AU - Ostendorf, R.

AU - Panebrattsev, Y.

AU - Pfeiffer, A.

AU - Ravinovich, I.

AU - Rehak, P.

AU - Sampietro, M.

AU - Schön, A.

AU - Schukraft, J.

AU - Schutz, Y.

AU - Shimansky, S.

AU - Shor, A.

AU - Simon, R. S.

AU - Specht, H. J.

AU - Steiner, V.

AU - Tapprogge, S.

AU - Tel-Zur, G.

AU - Tserruya, I.

AU - Ullrich, Th

AU - Wilschut, H.

AU - Wurm, J. P.

PY - 1998

Y1 - 1998

N2 - 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 ≈ 1.5 GeV/c2 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 η 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/c2, and of 28% in the mass range above 750 MeV/c2 at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.

AB - 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 ≈ 1.5 GeV/c2 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 η 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/c2, and of 28% in the mass range above 750 MeV/c2 at 90% confidence limit. Any unconventional source of electron pairs is limited by these error margins as the percentage fraction of the hadronic contribution.

UR - https://www.scopus.com/pages/publications/0039835465

U2 - 10.1007/PL00021659

DO - 10.1007/PL00021659

M3 - Article

SN - 1434-6044

VL - 4

SP - 231

EP - 247

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

ER -

Systematic study of low-mass electron pair production in p-Be and p-Au collisions at 450 GeV/c

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