Wide-acceptance measurement of the K-/K+ ratio from Ni+Ni collisions at 1.91A GeV
The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semicentral collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K−/K+ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
15 January 2019
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| In: |
Physical review
Year: 2019, Volume: 99, Issue: 1 |
| ISSN: | 2469-9993 |
| DOI: | 10.1103/PhysRevC.99.014904 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevC.99.014904 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevC.99.014904 
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| Author Notes: | K. Piasecki, 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, Z. Tymiński, P. Wagner, I. Weber, E. Widmann, K. Wiśniewski, Z.G. Xiao, H.S. Xu, I. Yushmanov, Y. Zhang, A. Zhilin, V. Zinyuk, and J. Zmeskal (FOPI Collaboration) |
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| 245 | 1 | 0 | |a Wide-acceptance measurement of the K-/K+ ratio from Ni+Ni collisions at 1.91A GeV |c K. Piasecki, 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, Z. Tymiński, P. Wagner, I. Weber, E. Widmann, K. Wiśniewski, Z.G. Xiao, H.S. Xu, I. Yushmanov, Y. Zhang, A. Zhilin, V. Zinyuk, and J. Zmeskal (FOPI Collaboration) |
| 246 | 3 | 3 | |a Wide-acceptance measurement of the K minus / K plus ratio from Ni plus Ni collisions at 1.91A GeV |
| 264 | 1 | |c 15 January 2019 | |
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| 520 | |a The FOPI Collaboration at the GSI SIS-18 synchrotron measured charged kaons from central and semicentral collisions of Ni+Ni at a beam energy of 1.91A GeV. We present the distribution of the K−/K+ ratio on the energy vs polar angle plane in the nucleon-nucleon center-of-mass frame, with and without subtraction of the contribution of ϕ(1020) meson decays to the K− yield. The acceptance of the current experiment is substantially wider compared to the previous measurement of the same colliding system. The ratio of K− to K+ energy spectra is expected to be sensitive to the in-medium modifications of basic kaon properties like mass. Recent results obtained by the HADES Collaboration at 1.23A and 1.76A GeV indicate that after inclusion of the ϕ meson decay contribution to the K− production no difference between the slopes of the K− and K+ energy spectra is observed within uncertainties. For our data a linear fit to this ratio obtained after subtraction of the ϕ meson contribution still shows a decrease with kinetic energy, although a constant value cannot be rejected. The contribution of Λ(1520)→pK− decays estimated from fitting the thermal model to the experimental yields appears to be another factor of moderate relevance. | ||
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