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Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy
Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda were measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda ) to more than 2...
| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
2012
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/j.nuclphysa.2012.08.004 http://cds.cern.ch/record/1449646 |
| _version_ | 1780924889903923200 |
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| author | Adamova, D. Agakichiev, G. Andronic, A. 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. Hering, G. Holeczek, J. Kalisky, M. Krobath, G. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Miskowiec, D. Panebrattsev, Y. Petchenova, O. Petracek, V. Radomski, S. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schuchmann, S. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Tsiledakis, G. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, S. Yurevich, V. |
| author_facet | Adamova, D. Agakichiev, G. Andronic, A. 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. Hering, G. Holeczek, J. Kalisky, M. Krobath, G. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Miskowiec, D. Panebrattsev, Y. Petchenova, O. Petracek, V. Radomski, S. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schuchmann, S. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Tsiledakis, G. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, S. Yurevich, V. |
| author_sort | Adamova, D. |
| collection | CERN |
| description | Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda were measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda ) to more than 2 GeV/c. The proton v2(pT) is extracted from the sample of \pi+ candidates using particle ratios from NA49 adapted to CERES acceptance and analysis cuts. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis, v2 in the series \pi- - K0short - p - \Lambda is seen to fall towards low pT increasingly below the hydro calculations even for kinetic freeze-out at Tf= 160 MeV which effectively suppress the hadronic evolution. The proton v2(pT) shows a downward swing towards low pT with excursions into negative values; the possible impact of a pion-flow isospin asymmetry observed by STAR at RHIC is found not to alter these conclusions. Results are discussed in perspective of recent viscous hydrodynamics studies which focus on the late hadronic stages. |
| id | cern-1449646 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2012 |
| record_format | invenio |
| spelling | cern-14496462021-07-15T02:38:27Zdoi:10.1016/j.nuclphysa.2012.08.004http://cds.cern.ch/record/1449646engAdamova, D.Agakichiev, G.Andronic, A.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.Hering, G.Holeczek, J.Kalisky, M.Krobath, G.Kushpil, V.Maas, A.Marin, A.Milosevic, J.Miskowiec, D.Panebrattsev, Y.Petchenova, O.Petracek, V.Radomski, S.Rak, J.Ravinovich, I.Rehak, P.Sako, H.Schmitz, W.Schuchmann, S.Sedykh, S.Shimansky, S.Stachel, J.Sumbera, M.Tilsner, H.Tserruya, I.Tsiledakis, G.Wessels, J.P.Wienold, T.Wurm, J.P.Yurevich, S.Yurevich, V.Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energyNuclear Physics - ExperimentDifferential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda were measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda ) to more than 2 GeV/c. The proton v2(pT) is extracted from the sample of \pi+ candidates using particle ratios from NA49 adapted to CERES acceptance and analysis cuts. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis, v2 in the series \pi- - K0short - p - \Lambda is seen to fall towards low pT increasingly below the hydro calculations even for kinetic freeze-out at Tf= 160 MeV which effectively suppress the hadronic evolution. The proton v2(pT) shows a downward swing towards low pT with excursions into negative values; the possible impact of a pion-flow isospin asymmetry observed by STAR at RHIC is found not to alter these conclusions. Results are discussed in perspective of recent viscous hydrodynamics studies which focus on the late hadronic stages.Differential elliptic flow spectra v2(pT) of π− , KS0 , p , Λ have been measured at sNN=17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb + Au collisions (10% of σgeo ). The pT range extends from about 0.1 GeV/ c (0.55 GeV/ c for Λ ) to more than 2 GeV/ c . Protons below 0.4 GeV/ c are directly identified by dE/dx . At higher pT , proton elliptic flow is derived as a constituent, besides π+ and K+ , of the elliptic flow of positive pion candidates. This retrieval requires additional inputs: (i) of the particle composition, and (ii) of v2(pT) of positive pions. For (i), particle ratios obtained by NA49 are adapted to CERES conditions; for (ii), the measured v2(pT) of negative pions is substituted, assuming π+ and π− elliptic flow magnitudes to be sufficiently close. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis of the series π−–KS0–p–Λ , flow magnitudes are seen to fall with decreasing pT progressively even below hydro calculations with early kinetic freeze-out ( Tf=160 MeV ) leaving not much time for hadronic evolution. The proton v2(pT) data show a downward swing towards low pT with excursions into negative v2 values. The pion-flow isospin asymmetry observed recently by STAR at RHIC, invalidating in principle our working assumption, is found in its impact on proton flow bracketed from above by the direct proton flow data, and not to alter any of our conclusions. Results are discussed in perspective of recent viscous hydrodynamics studies which focus on late hadronic stages.Differential elliptic flow spectra v2(pT) of \pi-, K0short, p, \Lambda have been measured at \sqrt(s NN)= 17.3 GeV around midrapidity by the CERN-CERES/NA45 experiment in mid-central Pb+Au collisions (10% of \sigma(geo)). The pT range extends from about 0.1 GeV/c (0.55 GeV/c for \Lambda) to more than 2 GeV/c. Protons below 0.4 GeV/c are directly identified by dE/dx. At higher pT, proton elliptic flow v2(pT) is derived as a constituent, besides \pi+ and K+, of the elliptic flow of positive pion candidates. The retrieval requires additional inputs: (i) of the particle composition, and (ii) of v2(pT) of positive pions. For (i), particle ratios obtained by NA49 were adapted to CERES conditions; for (ii), the measured v2(pT) of negative pions is substituted, assuming \pi+ and \pi- elliptic flow magnitudes to be sufficiently close. The v2(pT) spectra are compared to ideal-hydrodynamics calculations. In synopsis of the series \pi- - K0short - p - \Lambda, flow magnitudes are seen to fall with decreasing pT progressively even below hydro calculations with early kinetic freeze-out (Tf= 160 MeV) leaving not much time for hadronic evolution. The proton v2(pT) data show a downward swing towards low pT with excursions into negative v2 values. The pion-flow isospin asymmetry observed recently by STAR at RHIC, invalidating in principle our working assumption, is found in its impact on proton flow bracketed from above by the direct proton flow data, and not to alter any of our conclusions. Results are discussed in perspective of recent viscous dynamics studies which focus on late hadronic stages.arXiv:1205.3692oai:cds.cern.ch:14496462012-05-17 |
| spellingShingle | Nuclear Physics - Experiment Adamova, D. Agakichiev, G. Andronic, A. 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. Hering, G. Holeczek, J. Kalisky, M. Krobath, G. Kushpil, V. Maas, A. Marin, A. Milosevic, J. Miskowiec, D. Panebrattsev, Y. Petchenova, O. Petracek, V. Radomski, S. Rak, J. Ravinovich, I. Rehak, P. Sako, H. Schmitz, W. Schuchmann, S. Sedykh, S. Shimansky, S. Stachel, J. Sumbera, M. Tilsner, H. Tserruya, I. Tsiledakis, G. Wessels, J.P. Wienold, T. Wurm, J.P. Yurevich, S. Yurevich, V. Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title | Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title_full | Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title_fullStr | Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title_full_unstemmed | Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title_short | Elliptic flow of charged pions, protons and strange particles emitted in Pb+Au collisions at top SPS energy |
| title_sort | elliptic flow of charged pions, protons and strange particles emitted in pb+au collisions at top sps energy |
| topic | Nuclear Physics - Experiment |
| url | https://dx.doi.org/10.1016/j.nuclphysa.2012.08.004 http://cds.cern.ch/record/1449646 |
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