Conveners
Parallel session B3: Light Mesons and Baryons 3
- Gernot Eichmann (University of Graz)
Glueballs remain an experimentally undiscovered prediction of QCD. Lattice QCD predicts a spectrum of glueballs, with the tensor ($J^{PC}=2^{++}$) glueball being the second lightest, behind the scalar glueball. From an effective field theory based on spontaneous and explicit chiral symmetry breaking, we compute branching ratios of the tensor glueball into various meson decay channels. We find...
The COMPASS experiment at the SPS-enjected M2 beam line at CERN is a major player in the field of light-meson spectroscopy. The two-stage spectrometer provided a good acceptance and covered a wide kinematic range for charged and neutral particles, allowing to access a wide range of final states. Operating with liquid hydrogen as well as heavier nuclear targets and a negative hadron beam at 190...
COMPASS aims at extracting the excitation spectrum of light and strange mesons in diffractive scattering. Resonances are identified through partial wave analysis, which inherently relies on analysis models. Besides statistical uncertainties, systematic effects connected to the analysis methods are a key challenge. We will discuss some sources of systematics connected to $\pi^-\pi^-\pi^+$ and...
Mathematical ambiguities in partial wave analysis cause unavoidable problems in interpreting data from scattering experiments. These ambiguities appear as distinct sets of partial waves which can describe the same experimental data. In principle, these ambiguities may be resolved by leveraging knowledge about the physics of the process of interest, or by enforcing additional constraints. We...
