在欧洲核子研究中心的超级质子同步加速器上，通过重离子碰撞测量的φ介子的轻子和带电K介子衰变模式。

Leptonic and charged kaon decay modes of the phi meson measured in heavy-ion collisions at the CERN super proton synchrotron.

作者信息

Adamová D, Agakichiev G, Antończyk D, Appelshäuser H, Belaga V, Bielcíková 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, Glässel P, Hering G, Holeczek J, Krobath G, Kushpil V, Ludolphs W, Maas A, Marín A, Milosević J, Miśkowiec D, Ortega R, Panebrattsev Y, Petchenova O, Petrácek 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

机构信息

NPI/ASCR, Rez, Czech Republic.

出版信息

Phys Rev Lett. 2006 Apr 21;96(15):152301. doi: 10.1103/PhysRevLett.96.152301.

DOI:10.1103/PhysRevLett.96.152301

PMID:16712151

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.

摘要

我们报告了在实验室能量E(lab)=158A GeV下，铅-金中心碰撞中介子产生的测量结果。在高能重离子碰撞的历史上，首次在同一实验中，通过K⁺K⁻和双轻子衰变通道对φ介子进行了重建。该测量给出了在快度中心附近，来自两个衰变通道的快度密度，分别为2.05±0.14(统计)±0.25(系统)和2.04±0.49(统计)±0.32(系统)。在两个衰变通道中，测量得到的横向动量谱的形状也非常吻合。这些数据排除了在95%置信水平下，轻子衰变通道中φ产额比强子衰变通道增强1.6倍或更大的可能性。这排除了文献中报道的两个不同实验对强子衰变通道和双μ子衰变通道测量之间的差异。