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Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS
We report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2<m<1 GeV/c^2 is enhanced by a factor of 5.1+-1.3(stat)+-1.0/1.5(syst data/decays) over the expectation from ne...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2002
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevLett.91.042301 http://cds.cern.ch/record/582888 |
| _version_ | 1780899480668733440 |
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| author | Adamova, D. Agakichiev, G. Appelshauser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Hering, G. Holeczek, J. Kushpil, V. Lenkeit, B. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Richter, M. Sako, H. Schmitz, W. Sedykh, S. Seipp, W. Sharma, A. Shimansky, S. Slivova, J. Specht, H.J. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_facet | Adamova, D. Agakichiev, G. Appelshauser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Hering, G. Holeczek, J. Kushpil, V. Lenkeit, B. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Richter, M. Sako, H. Schmitz, W. Sedykh, S. Seipp, W. Sharma, A. Shimansky, S. Slivova, J. Specht, H.J. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_sort | Adamova, D. |
| collection | CERN |
| description | We report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2<m<1 GeV/c^2 is enhanced by a factor of 5.1+-1.3(stat)+-1.0/1.5(syst data/decays) over the expectation from neutral meson decays, more than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi+ pi- -> e+ e- annihilation with a modified rho-propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature. |
| id | cern-582888 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2002 |
| record_format | invenio |
| spelling | cern-5828882020-03-12T03:48:18Zdoi:10.1103/PhysRevLett.91.042301http://cds.cern.ch/record/582888engAdamova, D.Agakichiev, G.Appelshauser, H.Belaga, V.Braun-Munzinger, P.Cherlin, A.Damjanovic, S.Dietel, T.Dietrich, L.Drees, A.Esumi, S.I.Filimonov, K.Fomenko, K.Fraenkel, Z.Garabatos, C.Glassel, P.Hering, G.Holeczek, J.Kushpil, V.Lenkeit, B.Maas, A.Marin, A.Milosevic, J.Milov, A.Miskowiec, D.Panebrattsev, Yu.Petchenova, O.Petracek, V.Pfeiffer, A.Rak, J.Ravinovich, I.Rehak, P.Richter, M.Sako, H.Schmitz, W.Sedykh, S.Seipp, W.Sharma, A.Shimansky, S.Slivova, J.Specht, H.J.Stachel, J.Sumbera, M.Tilsner, H.Tserruya, I.Wessels, J.P.Wienold, T.Windelband, B.Wurm, J.P.Xie, W.Yurevich, S.Yurevich, V.Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPSNuclear Physics - ExperimentWe report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2<m<1 GeV/c^2 is enhanced by a factor of 5.1+-1.3(stat)+-1.0/1.5(syst data/decays) over the expectation from neutral meson decays, more than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi+ pi- -> e+ e- annihilation with a modified rho-propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.We report on first measurements of low-mass electron pairs in Pb-Au collisions at the lower SPS beam energy of 40 AGeV. The pair yield integrated over the range of invariant masses 0.2<m<1 GeV/c^2 is enhanced by a factor of 5.1+-1.3(stat)+-1.0/1.5(syst data/decays) over the expectation from neutral meson decays, more than previously observed at the higher energy of 158 AGeV. The results are discussed with reference to model calculations based on pi+ pi- -> e+ e- annihilation with a modified rho-propagator. They may be linked to chiral symmetry restoration and support the notion that the in-medium modifications of the rho are more driven by baryon density than by temperature.nucl-ex/0209024oai:cds.cern.ch:5828882002-09-25 |
| spellingShingle | Nuclear Physics - Experiment Adamova, D. Agakichiev, G. Appelshauser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Hering, G. Holeczek, J. Kushpil, V. Lenkeit, B. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Richter, M. Sako, H. Schmitz, W. Sedykh, S. Seipp, W. Sharma, A. Shimansky, S. Slivova, J. Specht, H.J. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title | Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title_full | Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title_fullStr | Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title_full_unstemmed | Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title_short | Enhanced production of low-mass electron-positron pairs in 40-AGeV Pb-Au collisions at the CERN SPS |
| title_sort | enhanced production of low-mass electron-positron pairs in 40-agev pb-au collisions at the cern sps |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1103/PhysRevLett.91.042301 http://cds.cern.ch/record/582888 |
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