München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.1: Poster

Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium

Search for exotic states in e⁺e⁻→γη^′π⁺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 J^PC=1⁺⁺ or the Y(4260) with J^PC=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 J^PC=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→γη^′π⁺π⁻, the process e⁺e⁻→γη^′π⁺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 L_int>480 pb⁻¹, are used. In addition to the search for charmonium(-like) contributions, the subsystem η^′π⁺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.