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18 April 2024

» pubmed » pmid16712151

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Leptonic and charged kaon decay modes of the phi meson measured in heavy-ion collisions at the CERN super proton synchrotron
D Adamová ; G Agakichiev ; D Anto?czyk ; H Appelshäuser ; V Belaga ; J Bielcíková ; P Braun-Munzinger ; O Busch ; A Cherlin ; S Damjanovic ; T Dietel ; L Dietrich ; A Drees ; S I Esumi ; K Filimonov ; K Fomenko ; Z Fraenkel ; C Garabatos ; P Glässel ; G Hering ; J Holeczek ; G Krobath ; V Kushpil ; W Ludolphs ; A Maas ; A Marín ; J Milosevi? ; D Mi?kowiec ; R Ortega ; Y Panebrattsev ; O Petchenova ; V Petrácek ; S Radomski ; J Rak ; I Ravinovich ; P Rehak ; H Sako ; W Schmitz ; J Schukraft ; S Sedykh ; S Shimansky ; J Stachel ; M Sumbera ; H Tilsner ; I Tserruya ; G Tsiledakis ; J P Wessels ; T Wienold ; J P Wurm ; S Yurevich ; V Yurevich ; ;
Date:	21 Apr 2006
Journal:	Phys Rev Lett, 96 (15), 152301
Abstract:	We report on results of a measurement of meson production in central Pb-Au collisions at E(lab) = 158A GeV. For the first time in the history of high energy heavy-ion collisions, phi mesons were reconstructed both in the K+K- and the dilepton decay channels in the same experiment. This measurement yields rapidity densities near midrapidity, from the two decay channels, 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 spectrum 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 decay channel of a factor 1.6 or larger at the 95% C.L. This rules out the discrepancy reported in the literature between measurements of the hadronic and dimuon decay channels by two different experiments.
Source:	PubMed, pmid16712151
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