A lattice QCD calculation of the charmonium spectrum [Elektronische Ressource] / Christian Ehmann

On November 11, 1974 the J/Ψ charmonium particle was discovered simultaneously on both coasts of the United States. This state is mainly built up from a charm quark and an anti-charm quark. Until then only three so-called flavors of quarks were known experimentally: up, down and strange. Since then several new charmonium resonances have been detected whose proper-ties could mostly be accounted for by nonrela-tivistic potential models with a confining force. However, many of the very recent discoveries are at variance with this simplistic picture. One such example is the so-called X (3872) particle. Future dedicated experiments like PANDA at FAIR in Darmstadt are expected to produce large charmonium data samples that will help to fur-ther explore the properties of old and new such states. Quarks are an elementary building block of vis-ible matter. They interact via the strong interac- Christian Ehmanntion, which is described by the theory of Quan-tum Chromo Dynamics (QCD). With the help of numerical simulations in the framework of Lat-tice QCD, i.e. QCD on a discretized spacetime, A Lattice QCD Calculationthis work tries to shed light on the masses and structure of charmonium states, including the of the Charmonium Spectrummore exotic ones.