München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.1: Poster

Donnerstag, 21. März 2019, 16:30–19:00, Foyer Theresanium

Search for exotic states in e+e→γηπ+π above 4 GeV with the BESIII experiment — •Frederik Weidner, Johannes Bloms, Nils Hüsken, Johannes Kellers, Alfons Khoukaz, and Marcel Rump — Westfälische Wilhelms-Universität Münster, Münster, Germany

In the search for states in the charmonium energy region many particles have been found which could not be described by conventional cc states. Examples for these charmonium-like states are the X(3872) with quantum numbers JPC=1++ or the Y(4260) with JPC=1. To obtain information on the nature of theses states, it is essential to determine their decay patterns which might give hints on their internal structure.
With the BESIII detector charmonium and charmonium-like states with JPC=1 can be investigated directly via the annihilation of an electron and a positron provided by BEPCII. Based on a previous BESIII analysis on J/ψ→γηπ+π, the process e+e→γηπ+π is studied. For this purpose 15 datasets in the energy region of 4.0 GeV≤√s≤ 4.6 GeV, each with an integrated luminosity of Lint>480 pb−1, are used. In addition to the search for charmonium(-like) contributions, the subsystem ηπ+π gives access to resonances in the light hadron sector. Here, different resonances like the X(1835) have been reported, whose quantum mechanical nature has not yet been determined.
The current status of the analysis will be presented.

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