Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron

G. Agakichiev; R. Baur; A. Breskin; R. Chechik; A. Drees; C. Jacob; U. Faschingbauer; P. Fischer; Z. Fraenkel; Ch Fuchs; E. Gatti; P. Glässel; Th Günzel; C. P. De Los Heros; F. Hess; D. Irmscher; B. Lenkeit; L. H. Olsen; Y. Panebrattsev; A. Pfeiffer; I. Ravinovich; P. Rehak; A. Schön; J. Schukraft; M. Sampietro; S. Shimansky; A. Shor; H. J. Specht; V. Steiner; S. Tapprogge; G. Tel-Zur; I. Tserruya; Th Ullrich; J. P. Wurm; V. Yurevich

doi:10.1103/PhysRevLett.75.1272

Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron

G. Agakichiev
, R. Baur
, A. Breskin
, R. Chechik
, A. Drees
, C. Jacob
, U. Faschingbauer
, P. Fischer
, Z. Fraenkel
, Ch Fuchs
, E. Gatti
, P. Glässel
, Th Günzel
, C. P. De Los Heros
, F. Hess
, D. Irmscher
, B. Lenkeit
, L. H. Olsen
, Y. Panebrattsev
, A. Pfeiffer

I. Ravinovich, P. Rehak, A. Schön, J. Schukraft, M. Sampietro, S. Shimansky, A. Shor, H. J. Specht, V. Steiner, S. Tapprogge, G. Tel-Zur, I. Tserruya, Th Ullrich, J. P. Wurm, V. Yurevich

Physics and Astronomy

Max Planck Institute for Nuclear Physics
Heidelberg University
Weizmann Institute of Science
Polytechnic University of Milan
Brookhaven National Laboratory
CERN

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

541 Scopus citations

Abstract

We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2<m<1.5GeV/c2 is observed. The properties of the excess suggest that it arises from two-pion annihilation ππ→e+e-.

Original language	English
Pages (from-to)	1272-1275
Number of pages	4
Journal	Physical Review Letters
Volume	75
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.75.1272
State	Published - 1995

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Agakichiev, G., Baur, R., Breskin, A., Chechik, R., Drees, A., Jacob, C., Faschingbauer, U., Fischer, P., Fraenkel, Z., Fuchs, C., Gatti, E., Glässel, P., Günzel, T., De Los Heros, C. P., Hess, F., Irmscher, D., Lenkeit, B., Olsen, L. H., Panebrattsev, Y., ... Yurevich, V. (1995). Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron. Physical Review Letters, 75(7), 1272-1275. https://doi.org/10.1103/PhysRevLett.75.1272

@article{a55bc7c7b7214027aba8420c81be62ba,

title = "Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron",

abstract = "We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2",

author = "G. Agakichiev and R. Baur and A. Breskin and R. Chechik and A. Drees and C. Jacob and U. Faschingbauer and P. Fischer and Z. Fraenkel 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 D. Irmscher and B. Lenkeit and Olsen, \{L. H.\} and Y. Panebrattsev and A. Pfeiffer and I. Ravinovich and P. Rehak and A. Sch{\"o}n and J. Schukraft and M. Sampietro and S. Shimansky and A. Shor and Specht, \{H. J.\} and V. Steiner and S. Tapprogge and G. Tel-Zur and I. Tserruya and Th Ullrich and Wurm, \{J. P.\} and V. Yurevich",

year = "1995",

doi = "10.1103/PhysRevLett.75.1272",

language = "English",

volume = "75",

pages = "1272--1275",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "7",

}

Agakichiev, G, Baur, R, Breskin, A, Chechik, R, Drees, A, Jacob, C, Faschingbauer, U, Fischer, P, Fraenkel, Z, Fuchs, C, Gatti, E, Glässel, P, Günzel, T, De Los Heros, CP, Hess, F, Irmscher, D, Lenkeit, B, Olsen, LH, Panebrattsev, Y, Pfeiffer, A, Ravinovich, I, Rehak, P, Schön, A, Schukraft, J, Sampietro, M, Shimansky, S, Shor, A, Specht, HJ, Steiner, V, Tapprogge, S, Tel-Zur, G, Tserruya, I, Ullrich, T, Wurm, JP & Yurevich, V 1995, 'Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron', Physical Review Letters, vol. 75, no. 7, pp. 1272-1275. https://doi.org/10.1103/PhysRevLett.75.1272

TY - JOUR

T1 - Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron

AU - Agakichiev, G.

AU - Baur, R.

AU - Breskin, A.

AU - Chechik, R.

AU - Drees, A.

AU - Jacob, C.

AU - Faschingbauer, U.

AU - Fischer, P.

AU - Fraenkel, Z.

AU - Fuchs, Ch

AU - Gatti, E.

AU - Glässel, P.

AU - Günzel, Th

AU - De Los Heros, C. P.

AU - Hess, F.

AU - Irmscher, D.

AU - Lenkeit, B.

AU - Olsen, L. H.

AU - Panebrattsev, Y.

AU - Pfeiffer, A.

AU - Ravinovich, I.

AU - Rehak, P.

AU - Schön, A.

AU - Schukraft, J.

AU - Sampietro, M.

AU - Shimansky, S.

AU - Shor, A.

AU - Specht, H. J.

AU - Steiner, V.

AU - Tapprogge, S.

AU - Tel-Zur, G.

AU - Tserruya, I.

AU - Ullrich, Th

AU - Wurm, J. P.

AU - Yurevich, V.

PY - 1995

Y1 - 1995

N2 - We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2

AB - We report on measurements of low-mass electron pairs in 450 GeV p-Be, p-Au, and 200 GeV/nucleon S-Au collisions at central rapidities. For the proton induced interactions, the low-mass spectra are, within the systematic errors, satisfactorily explained by electron pairs from hadron decays, whereas in the S-Au system an enhancement over the hadronic contributions by a factor of 5.0±0.7(stat)±2.0(syst) in the invariant mass range 0.2

UR - https://www.scopus.com/pages/publications/4243450179

U2 - 10.1103/PhysRevLett.75.1272

DO - 10.1103/PhysRevLett.75.1272

M3 - Article

AN - SCOPUS:4243450179

SN - 0031-9007

VL - 75

SP - 1272

EP - 1275

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

ER -

Enhanced production of low-mass electron pairs in 200 GeV/nucleon S-Au collisions at the CERN super proton synchrotron

Abstract

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