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Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
We report a measurement of low-mass electron pairsobserved in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 < m < 2.0 GeV is enhanced by a factor of 3.5 +/- 0.4 (stat) +/- 0.9 (syst) over the expectation from neutral meson decays. As observe...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
1998
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/S0370-2693(98)00083-5 http://cds.cern.ch/record/362780 |
| _version_ | 1780892754924011520 |
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| author | Agakichiev, G. Baur, R. Braun-Munzinger, P. Ceretto, F. Drees, A. Esumi, S. Faschingbauer, U. Fraenkel, Z. Fuchs, Ch. Gatti, E. Glässel, P. de los Heros, C.P. Holl, P. Jung, Ch. 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, H.J. Stachel, J. Tel-Zur, G. Tserruya, I. Ullrich, T. Voigt, C. Weber, C. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, V. |
| author_facet | Agakichiev, G. Baur, R. Braun-Munzinger, P. Ceretto, F. Drees, A. Esumi, S. Faschingbauer, U. Fraenkel, Z. Fuchs, Ch. Gatti, E. Glässel, P. de los Heros, C.P. Holl, P. Jung, Ch. 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, H.J. Stachel, J. Tel-Zur, G. Tserruya, I. Ullrich, T. Voigt, C. Weber, C. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, V. |
| author_sort | Agakichiev, G. |
| collection | CERN |
| description | We report a measurement of low-mass electron pairsobserved in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 < m < 2.0 GeV 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. For Pb-Au we find evidencefor 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 pt. |
| id | cern-362780 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 1998 |
| record_format | invenio |
| spelling | cern-3627802020-03-12T03:47:02Zdoi:10.1016/S0370-2693(98)00083-5http://cds.cern.ch/record/362780engAgakichiev, G.Baur, R.Braun-Munzinger, P.Ceretto, F.Drees, A.Esumi, S.Faschingbauer, U.Fraenkel, Z.Fuchs, Ch.Gatti, E.Glässel, P.de los Heros, C.P.Holl, P.Jung, Ch.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, H.J.Stachel, J.Tel-Zur, G.Tserruya, I.Ullrich, T.Voigt, C.Weber, C.Wessels, J.P.Wienold, T.Wurm, J.P.Yurevich, V.Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentumParticle Physics - ExperimentWe report a measurement of low-mass electron pairsobserved in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 < m < 2.0 GeV 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. For Pb-Au we find evidencefor 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 pt.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 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. 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 pt.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 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. 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 pt.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/c 2 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/c 2 . 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 ⊥ .nucl-ex/9712008oai:cds.cern.ch:3627801998 |
| spellingShingle | Particle Physics - Experiment Agakichiev, G. Baur, R. Braun-Munzinger, P. Ceretto, F. Drees, A. Esumi, S. Faschingbauer, U. Fraenkel, Z. Fuchs, Ch. Gatti, E. Glässel, P. de los Heros, C.P. Holl, P. Jung, Ch. 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, H.J. Stachel, J. Tel-Zur, G. Tserruya, I. Ullrich, T. Voigt, C. Weber, C. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, V. Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum |
| 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 |
| title_full | Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum |
| title_fullStr | Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum |
| title_full_unstemmed | Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum |
| title_short | Low-mass $e^{+}e^{-}$ pair production in 158 A GeV Pb - Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum |
| title_sort | low-mass $e^{+}e^{-}$ pair production in 158 a gev pb - au collisions at the cern sps, its dependence on multiplicity and transverse momentum |
| topic | Particle Physics - Experiment |
| url | https://dx.doi.org/10.1016/S0370-2693(98)00083-5 http://cds.cern.ch/record/362780 |
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