Nuclear Physics Seminar

"Unitarity in meson spectroscopy: implications for experiment, lattice, and models"

Presented by George Rupp, Instituto Superior Técnico

Tuesday, May 12, 2020, 11:00 am — Small Seminar Room, Bldg. 510

The most fundamental cornerstone of the PDG tables is the uniqueness of S-matrix pole positions of unstable particles, as a consequence of quantum-field-theory principles. Therefore, the unitarity property of the S-matrix should ideally be respected in whatever description of meson resonances in experiment, lattice-QCD simulations, and quark models. However, mesons are still often analyzed using non-unitary Breit-Wigner parametrizations and treated as manifest bound states on the lattice or in models. In the present talk I shall demonstrate the huge discrepancies that may result from such naive approaches, with potentially dramatic consequences for meson spectroscopy and the inferred confining potential.

Hosted by: Jin Huang

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