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Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c
We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgrad...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2006
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/j.physletb.2008.07.104 http://cds.cern.ch/record/998811 |
| _version_ | 1780911546904346624 |
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| author | Adamova, D. Agakichiev, G. Antonczyk, D. Appelshauser, H. Belaga, V. Bielcikova, J. Braun-Munzinger, P. Busch, O. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Dubitzky, W. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Holeczek, J. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_facet | Adamova, D. Agakichiev, G. Antonczyk, D. Appelshauser, H. Belaga, V. Bielcikova, J. Braun-Munzinger, P. Busch, O. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Dubitzky, W. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Holeczek, J. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_sort | Adamova, D. |
| collection | CERN |
| description | We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $\rho$ spectral function over a density-dependent shift of the $\rho$ pole mass at SPS energy. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $\rho$-meson in the hot fireball. |
| id | cern-998811 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2006 |
| record_format | invenio |
| spelling | cern-9988112019-09-30T06:29:59Zdoi:10.1016/j.physletb.2008.07.104http://cds.cern.ch/record/998811engAdamova, D.Agakichiev, G.Antonczyk, D.Appelshauser, H.Belaga, V.Bielcikova, J.Braun-Munzinger, P.Busch, O.Cherlin, A.Damjanovic, S.Dietel, T.Dietrich, L.Drees, A.Dubitzky, W.Esumi, S.I.Filimonov, K.Fomenko, K.Fraenkel, Z.Garabatos, C.Glassel, P.Holeczek, J.Kushpil, V.Maas, A.Marin, A.Milosevic, J.Milov, A.Miskowiec, D.Panebrattsev, Yu.Petchenova, O.Petracek, V.Pfeiffer, A.Rak, J.Ravinovich, I.Rehak, P.Sako, H.Schmitz, W.Sedykh, S.Shimansky, S.Stachel, J.Sumbera, M.Tilsner, H.Tserruya, I.Wessels, J.P.Wienold, T.Wurm, J.P.Xie, W.Yurevich, S.Yurevich, V.Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/cNuclear Physics - ExperimentWe present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $\rho$ spectral function over a density-dependent shift of the $\rho$ pole mass at SPS energy. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $\rho$-meson in the hot fireball.We present a measurement of $e^+e^-$ pair production in central Pb-Au collisions at 158$A$ GeV/$c$. As reported earlier, a significant excess of the $e^+e^-$ pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the $\rho$ spectral function over a density-dependent shift of the $\rho$ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to in-medium modifications of the $\rho$-meson in the hot fireball at SPS energy.We present a measurement of e+e− pair production in central Pb Au collisions at 158A GeV/c . As reported earlier, a significant excess of the e+e− pair yield over the expectation from hadron decays is observed. The improved mass resolution of the present data set, recorded with the upgraded CERES experiment at the CERN-SPS, allows for a comparison of the data with different theoretical approaches. The data clearly favor a substantial in-medium broadening of the ρ spectral function over a density-dependent shift of the ρ pole mass. The in-medium broadening model implies that baryon induced interactions are the key mechanism to the observed modifications of the ρ meson at SPS energy.nucl-ex/0611022oai:cds.cern.ch:9988112006-11-13 |
| spellingShingle | Nuclear Physics - Experiment Adamova, D. Agakichiev, G. Antonczyk, D. Appelshauser, H. Belaga, V. Bielcikova, J. Braun-Munzinger, P. Busch, O. Cherlin, A. Damjanovic, S. Dietel, T. Dietrich, L. Drees, A. Dubitzky, W. Esumi, S.I. Filimonov, K. Fomenko, K. Fraenkel, Z. Garabatos, C. Glassel, P. Holeczek, J. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Milov, A. Miskowiec, D. Panebrattsev, Yu. Petchenova, O. Petracek, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title | Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title_full | Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title_fullStr | Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title_full_unstemmed | Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title_short | Modification of the $\rho$-meson detected by low-mass electron-positron pairs in central Pb - Au collisions at 158 A GeV/c |
| title_sort | modification of the $\rho$-meson detected by low-mass electron-positron pairs in central pb - au collisions at 158 a gev/c |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1016/j.physletb.2008.07.104 http://cds.cern.ch/record/998811 |
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