Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

G. Agakichiev; R. Baur; P. Braun-Munzinger; F. Ceretto; A. Drees; S. Esumi; U. Faschingbauer; Z. Fraenkel; Ch Fuchs; E. Gatti; P. Glässel; C. P. De Los Heros; P. Holl; Ch Jung; B. Lenkeit; M. Messer; Y. Panebrattsev; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak; M. Richter; M. Sampietro; N. Saveljic; J. Schukraft; S. Shimansky; W. Seipp; E. Socol; H. J. Specht; J. Stachel; G. Tel-Zur; I. Tserruya; T. Ullrich; C. Voigt; C. Weber; J. P. Wessels; T. Wienold; J. P. Wurm; V. Yurevich

doi:10.1016/S0370-2693(98)00083-5

Low-mass e⁺e^- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

G. Agakichiev
, R. Baur
, P. Braun-Munzinger
, F. Ceretto
, A. Drees
, S. Esumi
, U. Faschingbauer
, Z. Fraenkel
, Ch Fuchs
, E. Gatti
, P. Glässel
, C. P. De Los Heros
, P. Holl
, Ch Jung
, B. Lenkeit
, M. Messer
, Y. Panebrattsev
, A. Pfeiffer
, J. Rak
, I. Ravinovich

S. Razin, P. Rehak, M. Richter, M. Sampietro, N. Saveljic, J. Schukraft, S. Shimansky, W. Seipp, E. Socol, H. J. Specht, J. Stachel, G. Tel-Zur, I. Tserruya, T. Ullrich, C. Voigt, C. Weber, J. P. Wessels, T. Wienold, J. P. Wurm, V. Yurevich

Physics and Astronomy

Joint Institute for Nuclear Research
GSI Helmholtz Centre for Heavy Ion Research
Max Planck Institute for Nuclear Physics
Weizmann Institute of Science
Brookhaven National Laboratory
CERN

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

253 Scopus citations

Abstract

We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c² is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c². For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥.

Original language	English
Pages (from-to)	405-412
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	422
Issue number	1-4
DOIs	https://doi.org/10.1016/S0370-2693(98)00083-5
State	Published - Mar 12 1998

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Agakichiev, G., Baur, R., Braun-Munzinger, P., Ceretto, F., Drees, A., Esumi, S., Faschingbauer, U., Fraenkel, Z., Fuchs, C., Gatti, E., Glässel, P., De Los Heros, C. P., Holl, P., Jung, C., Lenkeit, B., Messer, M., Panebrattsev, Y., Pfeiffer, A., Rak, J., ... Yurevich, V. (1998). Low-mass e⁺e^- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 422(1-4), 405-412. https://doi.org/10.1016/S0370-2693(98)00083-5

@article{09eca8f9c98a417bb1f50c837ceca5ff,

title = "Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum",

abstract = "We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c2 is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c2. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥.",

author = "G. Agakichiev and R. Baur and P. Braun-Munzinger and F. Ceretto and A. Drees and S. Esumi and U. Faschingbauer and Z. Fraenkel and Ch Fuchs and E. Gatti and P. Gl{\"a}ssel and \{De Los Heros\}, \{C. P.\} and P. Holl and Ch Jung and B. Lenkeit and M. Messer and Y. Panebrattsev and A. Pfeiffer and J. Rak and I. Ravinovich and S. Razin and P. Rehak and M. Richter and M. Sampietro and N. Saveljic and J. Schukraft and S. Shimansky and W. Seipp and E. Socol and Specht, \{H. J.\} and J. Stachel and G. Tel-Zur and I. Tserruya and T. Ullrich and C. Voigt and C. Weber and Wessels, \{J. P.\} and T. Wienold and Wurm, \{J. P.\} and V. Yurevich",

year = "1998",

month = mar,

day = "12",

doi = "10.1016/S0370-2693(98)00083-5",

language = "English",

volume = "422",

pages = "405--412",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

number = "1-4",

}

Agakichiev, G, Baur, R, Braun-Munzinger, P, Ceretto, F, Drees, A, Esumi, S, Faschingbauer, U, Fraenkel, Z, Fuchs, C, Gatti, E, Glässel, P, De Los Heros, CP, Holl, P, Jung, C, Lenkeit, B, Messer, M, Panebrattsev, Y, Pfeiffer, A, Rak, J, Ravinovich, I, Razin, S, Rehak, P, Richter, M, Sampietro, M, Saveljic, N, Schukraft, J, Shimansky, S, Seipp, W, Socol, E, Specht, HJ, Stachel, J, Tel-Zur, G, Tserruya, I, Ullrich, T, Voigt, C, Weber, C, Wessels, JP, Wienold, T, Wurm, JP & Yurevich, V 1998, 'Low-mass e⁺e^- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 422, no. 1-4, pp. 405-412. https://doi.org/10.1016/S0370-2693(98)00083-5

Low-mass e⁺e^- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum. / Agakichiev, G.; Baur, R.; Braun-Munzinger, P. et al.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 422, No. 1-4, 12.03.1998, p. 405-412.

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

TY - JOUR

T1 - Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

AU - Agakichiev, G.

AU - Baur, R.

AU - Braun-Munzinger, P.

AU - Ceretto, F.

AU - Drees, A.

AU - Esumi, S.

AU - Faschingbauer, U.

AU - Fraenkel, Z.

AU - Fuchs, Ch

AU - Gatti, E.

AU - Glässel, P.

AU - De Los Heros, C. P.

AU - Holl, P.

AU - Jung, Ch

AU - Lenkeit, B.

AU - Messer, M.

AU - Panebrattsev, Y.

AU - Pfeiffer, A.

AU - Rak, J.

AU - Ravinovich, I.

AU - Razin, S.

AU - Rehak, P.

AU - Richter, M.

AU - Sampietro, M.

AU - Saveljic, N.

AU - Schukraft, J.

AU - Shimansky, S.

AU - Seipp, W.

AU - Socol, E.

AU - Specht, H. J.

AU - Stachel, J.

AU - Tel-Zur, G.

AU - Tserruya, I.

AU - Ullrich, T.

AU - Voigt, C.

AU - Weber, C.

AU - Wessels, J. P.

AU - Wienold, T.

AU - Wurm, J. P.

AU - Yurevich, V.

PY - 1998/3/12

Y1 - 1998/3/12

N2 - We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c2 is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c2. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥.

AB - We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c2 is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c2. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥.

UR - https://www.scopus.com/pages/publications/0039397936

U2 - 10.1016/S0370-2693(98)00083-5

DO - 10.1016/S0370-2693(98)00083-5

M3 - Article

AN - SCOPUS:0039397936

SN - 0370-2693

VL - 422

SP - 405

EP - 412

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 - 1-4

ER -

Low-mass e⁺e^- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum

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