Speaker
Dr
George Rupp
(CeFEMA/IST, Univ. of Lisbon)
Description
Recent lattice results indicate that including meson-meson interpolating fields in unquenched
calculations of the light-meson spectrum may give rise to huge relative mass shifts as compared to similar computations with only quark-antiquark degrees of freedom. I this talk I shall focus
on the rho meson and its radial excitations, in the context of a unitarised quark model with all experimentally relevant meson-meson decay channels up to 2.0 GeV included. Note that such a
system of highly excited mesonic resonances is still way beyond the capacities of the most
advanced lattice approaches.
The employed formalism is the Resonance-Spectrum Expansion, which allows to solve the multichannel
S-matrix in closed form. The few model parameters are adjusted to the P-wave pion-pion phase
shifts measured several decades ago.
This work is in progress.
Author
Dr
George Rupp
(CeFEMA/IST, Univ. of Lisbon)
Co-authors
Prof.
Eef Van Beveren
(Physics Department, Univ. of Coimbra)
Dr
Susana Coito
(IMP/CAS, Lanzhou, China)
