arXiv · 2607.05595
$K^{*}(892)^0$ production and the time between freeze-outs in $^{40}$Ar+$^{45}$Sc collisions by NA61/SHINE at the CERN SPS
Abstract
The analysis of the production of strange $K^{*}(892)^0$ resonances allows us to better understand the temporal evolution of high-energy nucleus--nucleus collisions. In particular, the ratio of $K^{*}(892)^0$ to charged kaon yields is used to determine the time interval between chemical and kinetic freeze-outs. In this paper, the first measurements of $K^{*}(892)^0$ production in central $^{40}$Ar+$^{45}$Sc collisions at the CERN Super Proton Synchrotron are reported. They were performed by NA61/SHINE at collision center-of-mass energies per nucleon pair $\sqrt{s_\mathrm{NN}}$ = 8.8, 11.9, 16.8 GeV. The obtained $\langle K^{*}(892)^0 \rangle/\langle K^{+} \rangle $ and $\langle K^{*}(892)^0 \rangle/\langle K^{-} \rangle$ mean multiplicity ratios are compared with corresponding results in $p$+$p$ collisions, allowing for an estimate of the time interval between chemical and thermal freeze-outs in the $^{40}$Ar+$^{45}$Sc system. These are the first such results reported for $^{40}$Ar+$^{45}$Sc collisions.
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SHINE Collaboration, P. Adrich, K. K. Allison, M. Bajda, Y. Balkova, D. Battaglia, M. Bielewicz, A. Blondel, M. Bogomilov, Y. Bondar, J. Brzychczyk, M. Buryakov, A. F. Camino, Y. D. Chandak, M. Csanád, M. Ćwiok, T. Czopowicz, C. Dalmazzone, N. Davis, A. Dmitriev, P. von Doetinchem, W. Dominik, J. Dumarchez, R. Engel, L. Fields, Z. Fodor, M. Friend, M. Gaździcki, K. E. Gollwitzer, V. Golovatyuk, K. Grebieszkow, P. G. Hurh, S. Ilieva, V. A. Kireyeu, R. Kolesnikov, D. Kolev, Y. Koshio, S. Kowalski, T. Kowalski, B. Kozłowski, A. Krasnoperov, W. Kucewicz, M. Kuchowicz, P. Lasko, A. László, M. Lewicki, G. Lykasov, J. R. Lyon, V. V. Lyubushkin, M. Maćkowiak-Pawłowska, B. Maksiak, A. I. Malakhov, A. Marcinek, A. D. Marino, T. Matulewicz, V. Matveev, G. L. Melkumov, Ł. Mik, Y. Nagai, R. Nagy, T. Nakadaira, S. Nishimori, A. Olivier, V. Ozvenchuk, O. Panova, V. Paolone, I. Pidhurskyi, R. Płaneta, B. A. Popov, B. Pórfy, D. Pszczel, S. Puławski, L. Ren, V. Z. Reyna Ortiz, D. Röhrich, M. Roth, Ł. Rozpłochowski, M. Rumyantsev, A. Rustamov, M. Rybczyński, A. Rybicki, D. Rybka, K. Sakashita, K. Schmidt, P. Semeniuk, H. Shah, U. A. Shah, Y. Shiraishi, A. Shukla, M. Słodkowski, P. Staszel, G. Stefanek, J. Stepaniak, T. Šuša, Ł. Świderski, J. Szewiński, R. Szukiewicz, A. Tefelska, D. Tefelski, V. Tereshchenko. 2026-07-06. $K^{*}(892)^0$ production and the time between freeze-outs in $^{40}$Ar+$^{45}$Sc collisions by NA61/SHINE at the CERN SPS. https://arxiv.org/abs/2607.05595
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