Sideward Flow of K+ mesons in Ru+Ru and Ni+Ni Reactions near threshold

Crochet, P.; Herrmann, N.; Wisniewski, K.; Leifels, Y.; Andronic, A.; Averbeck, R.; Devismes, A.; Finck, C.; Gobbi, A.; Hartmann, O.; Hildenbrand, K. D.; Koczon, P.; Kress, T.; Kutsche, R.; Reisdorf, W.; Schüll, D.; Alard, J. P.; Barret, V.; Basrak, Z.; Bastid, N.; Belyaev, I.; Bendarag, A.; Berek, G.; Caplar, R.; Cindro, N.; Dupieux, P.; Dzelalija, M.; Eskef, M.; Fodor, Z.; Grishkin, Y.; Hong, B.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Korolija, M.; Kotte, R.; Kowalczyk, M.; Lebedev, A.; Lee, K. S.; Manko, V.; Merlitz, H.; Mohren, S.; Moisa, D.; Neubert, W.; Nianine, A.; Pelte, D.; Petrovici, M.; Plettner, C.; Rami, F.; Schauenburg, B. de; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek-Wilczynska, K.; Smolyankin, V.; Somov, A.; Stockmeier, M.; Stoicea, G.; Vasiliev, M.; Wagner, P.; Wohlfarth, D.; Yang, J. T.; Yushmanov, I.; Zhilin, A.

Sideward Flow of K+ mesons in Ru+Ru and Ni+Ni Reactions near threshold

Crochet, P.; Herrmann, N.; Wisniewski, K.; Leifels, Y.; Andronic, A.; Averbeck, R.; Devismes, A.; Finck, C.; Gobbi, A.; Hartmann, O.; Hildenbrand, K. D.; Koczon, P.; Kress, T.; Kutsche, R.; Reisdorf, W.; Schüll, D.; Alard, J. P.; Barret, V.; Basrak, Z.; Bastid, N.; Belyaev, I.; Bendarag, A.; Berek, G.; Caplar, R.; Cindro, N.; Dupieux, P.; Dzelalija, M.; Eskef, M.; Fodor, Z.; Grishkin, Y.; Hong, B.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Korolija, M.; Kotte, R.; Kowalczyk, M.; Lebedev, A.; Lee, K. S.; Manko, V.; Merlitz, H.; Mohren, S.; Moisa, D.; Neubert, W.; Nianine, A.; Pelte, D.; Petrovici, M.; Plettner, C.; Rami, F.; de Schauenburg, B.; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek-Wilczynska, K.; Smolyankin, V.; Somov, A.; Stockmeier, M.; Stoicea, G.; Vasiliev, M.; Wagner, P.; Wohlfarth, D.; Yang, J. T.; Yushmanov, I.; Zhilin, A.

Experimental data on K+ meson and proton sideward flow measured with the FOPI detector at SIS/GSI in the reactions Ru+Ru at 1.69 AGeV and Ni+Ni at 1.93 AGeV are presented. The K+ sideward flow is found to be anti-correlated (correlated) with the one of protons at low (high) transverse momenta. When compared to the predictions of a transport model, the data favour the existence of an in-medium repulsive K+ nucleon potential.

Keywords: strangeness; collective motion; directed flow; sideward flow; in-medium potential

Physics Letters B 486 (2000) 6

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