Leptonic and charged kaon decay modes of the $\phi$ meson measured in heavy-ion collisions at the CERN Super Proton Synchrotron

We report a measurement of $\phi$ meson production in central Pb+Au collisions at E$_{lab}$/A=158 GeV. For the first time in heavy-ion collisions, $\phi$ mesons were reconstructed in the same experiment both in the K$^+$K$^-$ and the dilepton decay channel. Near mid-rapidity, this yields rapidity de...

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Detalles Bibliográficos
Autores principales: Adamova, D., Agakichiev, G., Antonczyk, D., Appelshauser, H., Belaga, V., Bielcikova, J., Braun-Munzinger, P., Busch, O., Cherlin, A., Damjanovic, S., Dietel, T., Dietrich, L., Drees, A., Esumi, S.I., Filimonov, K., Fomenko, K., Fraenkel, Z., Garabatos, C., Glassel, P., Hering, G., Holeczek, J., Krobath, G., Kushpil, V., Ludolphs, W., Maas, A., Marin, A., Milosevic, J., Miskowiec, D., Ortega, R., Panebrattsev, Y., Petchenova, O., Petracek, V., Radomski, S., Rak, J., Ravinovich, I., Rehak, P., Sako, H., Schmitz, W., Schukraft, J., Sedykh, S., Shimansky, S., Stachel, J., Sumbera, M., Tilsner, H., Tserruya, I., Tsiledakis, G., Wessels, J.P., Wienold, T., Wurm, J.P., Yurevich, S., Yurevich, V.
Lenguaje:eng
Publicado: 2005
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.96.152301
http://cds.cern.ch/record/913108
Descripción
Sumario:We report a measurement of $\phi$ meson production in central Pb+Au collisions at E$_{lab}$/A=158 GeV. For the first time in heavy-ion collisions, $\phi$ mesons were reconstructed in the same experiment both in the K$^+$K$^-$ and the dilepton decay channel. Near mid-rapidity, this yields rapidity densities, corrected for production at the same rapidity value, of 2.05 +- 0.14(stat) +- 0.25(syst) and 2.04 +- 0.49(stat)+-{0.32}(syst), respectively. The shape of the measured transverse momentum spectra is also in close agreement in both decay channels. The data rule out a possible enhancement of the $\phi$ yield in the leptonic over the hadronic channel by a factor larger than 1.6 at 95% CL.

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