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New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment
In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb - Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are pres...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2001
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1063/1.1469990 http://cds.cern.ch/record/519815 |
| _version_ | 1780897768843247616 |
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| author | Filimonov, K. Adamová, D. Agakichiev, G. Appelshäuser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanović, S. Dietel, T. Drees, A. Esumi, S.I. Fomenko, K. Fraenkel, Z. Garabatos, C. Glässel, P. Hering, G. Kushpil, V. Lenkeit, B. Maas, A. Marı́n, A. Milošević, J. Milov, A. Miśkowiec, D. Panebrattsev, Y. Petchenova, O. Petraček, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schukraft, J. Sedykh, S. Seipp, W. Shimansky, S. Slı́vová, J. Specht, H.J. Stachel, J. Šumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_facet | Filimonov, K. Adamová, D. Agakichiev, G. Appelshäuser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanović, S. Dietel, T. Drees, A. Esumi, S.I. Fomenko, K. Fraenkel, Z. Garabatos, C. Glässel, P. Hering, G. Kushpil, V. Lenkeit, B. Maas, A. Marı́n, A. Milošević, J. Milov, A. Miśkowiec, D. Panebrattsev, Y. Petchenova, O. Petraček, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schukraft, J. Sedykh, S. Seipp, W. Shimansky, S. Slı́vová, J. Specht, H.J. Stachel, J. Šumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. |
| author_sort | Filimonov, K. |
| collection | CERN |
| description | In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb - Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including $\Lambda$) and flow are presented. |
| id | cern-519815 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2001 |
| record_format | invenio |
| spelling | cern-5198152023-04-07T02:46:36Zdoi:10.1063/1.1469990http://cds.cern.ch/record/519815engFilimonov, K.Adamová, D.Agakichiev, G.Appelshäuser, H.Belaga, V.Braun-Munzinger, P.Cherlin, A.Damjanović, S.Dietel, T.Drees, A.Esumi, S.I.Fomenko, K.Fraenkel, Z.Garabatos, C.Glässel, P.Hering, G.Kushpil, V.Lenkeit, B.Maas, A.Marı́n, A.Milošević, J.Milov, A.Miśkowiec, D.Panebrattsev, Y.Petchenova, O.Petraček, V.Pfeiffer, A.Rak, J.Ravinovich, I.Rehak, P.Sako, H.Schmitz, W.Schukraft, J.Sedykh, S.Seipp, W.Shimansky, S.Slı́vová, J.Specht, H.J.Stachel, J.Šumbera, M.Tilsner, H.Tserruya, I.Wessels, J.P.Wienold, T.Windelband, B.Wurm, J.P.Xie, W.Yurevich, S.Yurevich, V.New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experimentNuclear Physics - ExperimentIn 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb - Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including $\Lambda$) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.In 1999 the CERES/NA45 ran at the CERN SPS with a beam energy of 40 GeV/nucleon. The data set comprises about 8.7 millions Pb-Au events with a trigger selection corresponding to approximately the most central 30% of the geometrical cross section. Results on low-mass electron pair analysis are presented. The upgrade of the experimental setup with the radial drift TPC has allowed to enhance hadron physics capabilities of the experiment. New results on hadron spectra (including Lambda) and flow are presented.Low-mass dilepton spectra are expected to provide information on the early stage of the relativistic heavy-ion collisions which may experience an onset of deconfinement and/or chiral symmetry restoration. The CERES/NA45 measurements of e+e−-pair production in 158 AGeV Pb-Au collisions revealed a significant excess of the dielectron yield over known hadronic sources in the invariant mass region 0.25<mee<0.7 GeV/c2 [1]. The enhancement is mostly observed for pairs with low transverse momentum ptee<0.5 GeV/c and increases stronger than linearly with the event multiplicity. These experimental data have stimulated extensive theoretical discussions on the mechanisms of low-mass dilepton production and emission from hot and dense hadronic medium (for a review see [2]). The thermal radiation from the interaction phase of the hadronic fireball via annihilation processes, predominantly π+π−→ρ→e+e−, may account for a large fraction of the observed enhancement. The spectral shape in the mass region of the excess, however, cannot be described and requires introducing in-medium effects on the ρ spectral function. Two scenarios that take into account in-medium modifications of the vector meson properties have been particularly successful in reproducing the CERES results. One assumes a reduction of the ρ-meson mass in the hot and dense medium as a precursor of chiral symmetry restoration [3], following Brown-Rho scaling [4]. Another approach uses a ρ-meson spectral function which takes into account modifications of meson properties due to interactions with the surrounding hadrons [5]. Dilepton production rates and shapes of the invariant mass spectra in these two calculations are very similar pointing to a shift of the hadron-parton duality threshold towards lower masses [6].nucl-ex/0109017oai:cds.cern.ch:5198152001-09-26 |
| spellingShingle | Nuclear Physics - Experiment Filimonov, K. Adamová, D. Agakichiev, G. Appelshäuser, H. Belaga, V. Braun-Munzinger, P. Cherlin, A. Damjanović, S. Dietel, T. Drees, A. Esumi, S.I. Fomenko, K. Fraenkel, Z. Garabatos, C. Glässel, P. Hering, G. Kushpil, V. Lenkeit, B. Maas, A. Marı́n, A. Milošević, J. Milov, A. Miśkowiec, D. Panebrattsev, Y. Petchenova, O. Petraček, V. Pfeiffer, A. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schukraft, J. Sedykh, S. Seipp, W. Shimansky, S. Slı́vová, J. Specht, H.J. Stachel, J. Šumbera, M. Tilsner, H. Tserruya, I. Wessels, J.P. Wienold, T. Windelband, B. Wurm, J.P. Xie, W. Yurevich, S. Yurevich, V. New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title | New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title_full | New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title_fullStr | New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title_full_unstemmed | New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title_short | New results on Pb - Au collisions at 40 AGeV from the CERES/NA45 experiment |
| title_sort | new results on pb - au collisions at 40 agev from the ceres/na45 experiment |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1063/1.1469990 http://cds.cern.ch/record/519815 |
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