Wide-acceptance measurement of the K−/K+ ratio from Ni+Ni collisions at 1.91A GeV (CROSBI ID 260322)
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Podaci o odgovornosti
Piasecki, K. ; Herrmann, N. ; Averbeck, R. ; Andronic, A. ; Barret, V. ; Basrak, Zoran ; Bastid, N. ; Benabderrahmane, M. L. ; Berger, M. ; Buehler, P. ; Cargnelli, M. ; Čaplar, Roman ; Cordier, E. ; Crochet, P. ; Czerwiakowa, O. ; Deppner, I. ; Dupieux, P. ; Dželalija, Mile ; Fabbietti, L. ; Fodor, Z. ; Gasik, P. ; Gašparić, Igor ; Grishkin, Y. ; Hartmann, O. N. ; Hildenbrand, K. D. ; Hong, B. ; Kang, T. I. ; Kecskemeti, J. ; Kim, Y. J. ; Kirejczyk, M. ; Kiš, Mladen ; Koczon, P. ; Korolija, Milorad ; Kotte, R. ; Lebedev, A. ; Leifels, Y. ; Le Fèvre, A. ; Liu, J. L. ; Lopez, X. ; Mangiarotti, A. ; Manko, V. ; Marton, J. ; Matulewicz, T. ; Merschmeyer, M. ; Münzer, R. ; Pelte, D. ; Petrovici, M. ; Rami, F. ; Reischl, A. ; Reisdorf, W. ; Ryu, M. S. ; Schmidt, P. ; Schüttauf, A. ; Seres, Z. ; Sikora, B. ; Sim, K. S. ; Simion, V. ; Siwek-Wilczyńska, K. ; Smolyankin, V. ; Stoicea, G. ; Suzuki, K. ; Tymiński, Z. ; Wagner, P. ; Weber, Ivana ; Widmann, E. ; Wiśniewski, K. ; Xiao, Z. G. ; Xu, H. S. ; Yushmanov, I. ; Zhang, Y. ; Zhilin, A. ; Zinyuk, V. ; Zmeskal, J. ; FOPI Collaboration
FOPI Collaboration
engleski
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 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.
heavy-ion collisions ; charged kaons ; in-medium ; strange particles
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