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arXiv · 1602.04378

Centrality dependence of subthreshold $\phi$ meson production in Ni+Ni collisions at 1.9A GeV

K. Piasecki·Z. Tymiński·N. Herrmann·R. Averbeck·A. Andronic·V. Barret·Z. Basrak·N. Bastid·M. L. Benabderrahmane·M. Berger·P. Buehler·M. Cargnelli·R. Čaplar·E. Cordier·P. Crochet·O. Czerwiakowa·I. Deppner·P. Dupieux·M. Dželalija·L. Fabbietti·Z. Fodor·P. Gasik·I. Gašparić·Y. Grishkin·O. N. Hartmann·K. D. Hildenbrand·B. Hong·T. I. Kang·J. Kecskemeti·Y. J. Kim·M. Kirejczyk·M. Kiš·P. Koczon·M. Korolija·R. Kotte·A. Lebedev·Y. Leifels·A. Le Fèvre·J. L. Liu·X. Lopez·A. Mangiarotti·V. Manko·J. Marton·T. Matulewicz·M. Merschmeyer·R. Münzer·D. Pelte·M. Petrovici·F. Rami·A. Reischl·W. Reisdorf·M. S. Ryu·P. Schmidt·A. Schüttauf·Z. Seres·B. Sikora·K. S. Sim·V. Simion·K. Siwek-Wilczyńska·V. Smolyankin·G. Stoicea·K. Suzuki·P. Wagner·I. Weber·E. Widmann·K. Wiśniewski·Z. G. Xiao·H. S. Xu·I. Yushmanov·Y. Zhang·A. Zhilin·V. Zinyuk·J. Zmeskal
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Abstract

We analysed the $\phi$ meson production in central Ni+Ni collisions at the beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found the production probability per event of $[8.6 ~\pm~ 1.6 ~(\text{stat}) \pm 1.5 ~(\text{syst})] \times 10^{-4}$. This new data point allows for the first time to inspect the centrality dependence of the subthreshold $\phi$ meson production in heavy-ion collisions. The rise of $\phi$ meson multiplicity per event with mean number of participants can be parameterized by the power function with exponent $\alpha = 1.8 \pm 0.6$. The ratio of $\phi$ to $\text{K}^-$ production yields seems not to depend within the experimental uncertainties on the collision centrality, and the average of measured values was found to be $0.36 \pm 0.05$.

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K. Piasecki, Z. Tymiński, N. Herrmann, R. Averbeck, A. Andronic, V. Barret, Z. Basrak, N. Bastid, M. L. Benabderrahmane, M. Berger, P. Buehler, M. Cargnelli, R. Čaplar, E. Cordier, P. Crochet, O. Czerwiakowa, I. Deppner, P. Dupieux, M. Dželalija, L. Fabbietti, Z. Fodor, P. Gasik, I. Gašparić, Y. Grishkin, O. N. Hartmann, K. D. Hildenbrand, B. Hong, T. I. Kang, J. Kecskemeti, Y. J. Kim, M. Kirejczyk, M. Kiš, P. Koczon, M. Korolija, R. Kotte, A. Lebedev, Y. Leifels, A. Le Fèvre, J. L. Liu, X. Lopez, A. Mangiarotti, V. Manko, J. Marton, T. Matulewicz, M. Merschmeyer, R. Münzer, D. Pelte, M. Petrovici, F. Rami, A. Reischl, W. Reisdorf, M. S. Ryu, P. Schmidt, A. Schüttauf, Z. Seres, B. Sikora, K. S. Sim, V. Simion, K. Siwek-Wilczyńska, V. Smolyankin, G. Stoicea, K. Suzuki, P. Wagner, I. Weber, E. Widmann, K. Wiśniewski, Z. G. Xiao, H. S. Xu, I. Yushmanov, Y. Zhang, A. Zhilin, V. Zinyuk, J. Zmeskal. 2016-02-13. Centrality dependence of subthreshold $\phi$ meson production in Ni+Ni collisions at 1.9A GeV. https://doi.org/10.1103/physrevc.94.014901

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