Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadron Structure and Spectroscopy VI

HK 37.6: Talk

Wednesday, February 28, 2018, 18:00–18:15, HZO 50

Analysis of e⁺e⁻→ ppX, X = η, ω, φ — •Marcel Rump, Johannes Bloms, Nils Hüsken, Alfons Khoukaz, and Frederik Weidner for the BESIII collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster, Germany

Since the discovery of the X(3872) state by the BELLE experiment in 2003, a large number of new states was found in the mass region around 4 GeV/c², which apparently do not fit into the scheme of conventional charmonium states. The possibility that some of these states could be of exotic nature has raised interest on charmonium physics to a new level. Investigations of the type e⁺e⁻ → pp X have recently been started using the datasets collected with the Beijing Spectrometer III (BESIII) in positron-electron annihilations at the Beijing Electron-Positron Collider (BEPCII) in the energy region between √s = 3.8 GeV/c² and √s = 4.6 GeV/c². Systematic searches can be performed on heavy resonances decaying to pp X as well as decays via different nucleon resonances. In this talk, preliminary results of the analyses of the channels e⁺e⁻ → pp η, e⁺e⁻→ ppω and e⁺e⁻→ pp φ will be presented. Data selection, background analysis and the extraction of cross sections will be discussed.