Deep sub-threshold ϕ production in Au+Au collisions

Deep sub-threshold ϕ production in Au+Au collisions

We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.1...

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Veröffentlicht in:Physics letters. B 2018-03, Vol.778 (C), p.403-407
Hauptverfasser: Arnold, O., Behnke, C., Belounnas, A., Belyaev, A., Berger-Chen, J.C., Biernat, J., Blanco, A., Blume, C., Böhmer, M., Bordalo, P., Chernenko, S., Chlad, L., Deveaux, C., Dreyer, J., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Filip, P., Fonte, P., Franco, C., Friese, J., Galatyuk, T., Garzón, J.A., Gernhäuser, R., Golubeva, M., Greifenhagen, R., Guber, F., Gumberidze, M., Harabasz, S., Heinz, T., Hennino, T., Hlavac, S., Höhne, C., Holzmann, R., Ivashkin, A., Kämpfer, B., Karavicheva, T., Kardan, B., Koenig, I., Koenig, W., Kolb, B.W., Korcyl, G., Kornakov, G., Kotte, R., Kühn, W., Kugler, A., Kunz, T., Kurepin, A., Kurilkin, A., Ladygin, V., Lalik, R., Lapidus, K., Lebedev, A., Lorenz, M., Mahmoud, T., Maier, L., Mangiarotti, A., Markert, J., Maurus, S., Metag, V., Mihaylov, D.M., Morozov, S., Münzer, R., Naumann, L., Nowakowski, K.N., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Petukhov, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rodriguez-Ramos, P., Rosier, P., Rost, A., Sadovsky, A., Salabura, P., Scheib, T., Schuldes, H., Schwab, E., Scozzi, F., Sellheim, P., Siebenson, J., Silva, L., Sobolev, Yu.G., Spataro, S., Ströbele, H., Stroth, J., Svoboda, O., Szala, M., Tlusty, P., Tsertos, H., Usenko, E., Wagner, V., Wiebusch, M.G., Wirth, J., Zumbruch, P.
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Nuclear Experiment
Physics
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Zusammenfassung:We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.16 and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K− transverse-mass spectra can be explained solely by feed-down, which substantially softens the spectra of K− mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze-out temperatures of K+ and K− mesons caused by different couplings to baryons.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2018.01.048