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Excited J-- Resonances In Meson-Meson Scattering From Lattice Qcd
Johnson, Christopher
Johnson, Christopher
Abstract
Understanding the excited light meson spectrum is vital to our understanding of how quarks and gluons bind to become hadrons. This sector is home to a plethora of states including hadrons laying outside the quark model. Distinguishing the from the rest of the spectrum would be made easier if we first had a handle on the light quark anti-quark spectrum. I present the first determination of excited light JPC=1--,2--,3-- resonances in meson-meson scattering at the SU(3) flavor point from lattice QCD. This system can be described in the context of pseudoscalar-vector elastic scattering and I determine two 1-- resonances; a lighter broader state followed by a heavier narrow state, one broad 2-- resonance, and one narrow 3-- resonance. This is the first calculation in lattice QCD that successfully extracts two resonances from the same partial wave, as well as the first calculation of a light 2-- resonance. I present the results in terms of the physical resonance eigenstates decaying into pseudoscalar-vector final states, and compare to experiment as well as a popular phenomenological model.
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Date
2021-01-01
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Department
Physics
DOI
https://doi.org/10.21220/evzx-a853