München 2019 – wissenschaftliches Programm
HK 54.7: Poster
Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium
Investigating the decays J/ψ→ φ K+ K− and J/ψ→ φ KS0 KS0 with the BESIII experiment — •Nils Hüsken, Johannes Bloms, Johannes Kellers, Alfons Khoukaz, Marcel Rump, and Frederik Weidner — Westfälische Wilhelms-Universität Münster, Münster, Deutschland
The decays of the lightest charmonium vector state, the J/ψ, into a vector and two pseudoscalar particles present an ideal opportunity to study scalar and tensor resonances through their decays into a pair of pseudoscalar mesons. While gluon-rich radiative decays are exploited in the search for light glueballs, decays involving massive vector mesons like the ω or the φ offer some insight into the quark content of the scalar and tensor resonances. Specifically, decays of the type J/ψ→ φ K K strongly couple to those resonances containing large ss components. In a previous analysis based on 58×106 J/ψ decays gathered with BESII, the f0(980), f0(1710) and the f2′(1525), among other intermediate resonances, were found to strongly contribute to the J/ψ→ φ K+ K− decay. Assuming isospin symmetry, it is expected that decays involving either K+ K− or KS0 KS0 pairs only differ by a scaling factor. Using the world’s largest dataset of roughly 5.9×109 J/ψ decays this assumption is explored by investigation of the decays J/ψ→ φ K+ K− and J/ψ→ φ KS0 KS0 in a partial wave analysis. Resonant contributions to the J/ψ→ φ K K decay amplitude can be investigated with increased statistical precision, while the simultaneous consideration of the two different decay channels allows sensitivity to isospin violating contributions. The current status of the analysis will be discussed.