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  1. MAY

    12

    Tuesday

    Nuclear Physics Seminar

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

    Presented by George Rupp, Instituto Superior Técnico

    11 am, Small Seminar Room, Bldg. 510

    Tuesday, May 12, 2020, 11:00 am

    Hosted by: Jin Huang

    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.

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