Centrality dependence of subthreshold φ meson production in Ni plus Ni collisions at 1.9A GeV

被引:8
作者
Piasecki, K. [1 ]
Tyminski, Z. [1 ,2 ]
Herrmann, N. [3 ]
Averbeck, R. [4 ]
Andronic, A. [4 ]
Barret, V. [5 ,6 ]
Basrak, Z. [7 ]
Bastid, N. [5 ,6 ]
Benabderrahmane, M. L. [3 ]
Berger, M. [8 ,9 ]
Buehler, P. [10 ]
Cargnelli, M. [10 ]
Caplar, R.
Cordier, E. [3 ]
Crochet, P. [5 ,6 ]
Czerwiakowa, O. [1 ]
Deppner, I. [3 ]
Dupieux, P. [5 ,6 ]
Dzelalija, M. [11 ]
Fabbietti, L. [8 ,9 ]
Fodor, Z. [12 ]
Gasik, P. [1 ,8 ,9 ]
Gasparic, I. [7 ]
Grishkin, Y. [13 ]
Hartmann, O. N. [4 ]
Hildenbrand, K. D. [4 ]
Hong, B. [14 ]
Kang, T. I. [14 ]
Kecskemeti, J. [12 ]
Kim, Y. J. [4 ]
Kirejczyk, M. [1 ,2 ]
Kis, M. [4 ,7 ]
Koczon, P. [4 ]
Korolija, M. [7 ]
Kotte, R. [15 ]
Lebedev, A. [13 ]
Leifels, Y. [4 ]
Le Fevre, A. [4 ]
Liu, J. L. [3 ,16 ]
Lopez, X. [5 ,6 ]
Mangiarotti, A. [3 ]
Manko, V. [17 ]
Marton, J. [10 ]
Matulewicz, T. [1 ]
Merschmeyer, M. [3 ]
Muenzer, R. [9 ]
Pelte, D. [3 ]
Petrovici, M. [18 ]
Rami, F.
Reischl, A. [3 ]
机构
[1] Univ Warsaw, Fac Phys, Inst Expt Phys, Warsaw, Poland
[2] Natl Ctr Nucl Res, Otwock, Poland
[3] Heidelberg Univ, Phys Inst, Heidelberg, Germany
[4] GSI Helmholtzzentrum Schwerionenforsch GmbH, Darmstadt, Germany
[5] CNRS, IN2P3, Lab Phys Corpusculaire, Clermont Ferrand, France
[6] Univ Clermont Ferrand, Clermont Ferrand, France
[7] Rudjer Boskovic Inst, Zagreb, Croatia
[8] Tech Univ Munich, Excellence Cluster Univ, Garching, Germany
[9] Tech Univ Munich, Phys Dept, E12, Garching, Germany
[10] Austrian Acad Sci, Stefan Meyer Inst Subatomare Phys, Vienna, Austria
[11] Univ Split, Split, Croatia
[12] RMKI, Wigner RCP, Budapest, Hungary
[13] Inst Theoret & Expt Phys, Moscow, Russia
[14] Korea Univ, Seoul, South Korea
[15] Helmholtz Zentrum Dresden Rossendorf, Inst Strahlenphys, Dresden, Germany
[16] Harbin Inst Technol, Harbin, Peoples R China
[17] Kurchatov Inst, Natl Res Ctr, Moscow, Russia
[18] Inst Nucl Phys & Engn, Bucharest, Romania
[19] Inst Pluridisciplinaire Hubert Curien, Strasbourg, France
[20] Univ Strasbourg, Strasbourg, France
[21] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[22] Chinese Acad Sci, Inst Modern Phys, Lanzhou, Peoples R China
关键词
HEAVY-ION COLLISIONS; NI-58+NI-58 COLLISIONS; SIS ENERGIES; AGEV; STRANGENESS; SYMMETRY; DETECTOR; KAONS; FOPI;
D O I
10.1103/PhysRevC.94.014901
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
We analyzed the phi meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of [8.6 +/- 1.6(stat) +/- 1.5(syst)] x 10(-4). This new data point allows us for the first time to inspect the centrality dependence of subthreshold phi meson production in heavy-ion collisions. The rise of phi meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent alpha = 1.8 +/- 0.6. The ratio of phi to K- production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be 0.36 +/- 0.05.
引用
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页数:8
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