Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Hadronenstruktur und -spektroskopie

HK 61.1: Gruppenbericht

Donnerstag, 7. März 2013, 14:00–14:30, HSZ-105

Baryon spectroscopy at BESIII — •Yutie Liang, Jifeng Hu, Wolfgang Kühn, Jens Sören Lange, Björn Spruck, Matthias Ullrich, Marcel Werner, and Hua Ye — II. Physikalisches Institut, Giessen University, 35392, Germany

Although three-quark models of baryons are quite successful in interpreting low-lying excited baryon resonances, our present knowledge on baryon spectroscopy is still in its infancy. Many very fundamental issues in baryon spectroscopy are still not well understood. On the experimental side, our present knowledge of baryon spectroscopy has come almost entirely from the traditional π N and γ N experiments, in which many broad resonances with various possible quantum numbers overlap each other and make it difficult to disentangle. An alternative method to investigate baryon states employs decays of charmonium states such as J/ψ and ψ(3686), in which the natural isospin filter makes the analysis less complicate. In July 2008 the BESIII experiment in Beijing recorded the first hadronic e⁺e⁻ collision at the BEPCII storage ring. Since then, the BESIII detector has taken over 100 million Ψ(2S) and over 1 billion J/ψ events, as well as a data sample corresponding to an integrated luminosity of 2.9 fb⁻¹ at the ψ(3770) resonance. This is so far the largest amount of electron collider data on charmonia and provide the opportunity for high precise measurements. In this talk, a selection of recent results relevant to baryon spectroscopy are shown.