Charmonium excited state spectrum in lattice QCD

Details Charmonium excited state spectrum in lattice QCD Charmonium excited state spectrum in lattice QCD

2007-07-27

arxiv.org/abs/0707.4162v2

Phys.Rev.D77:034501,2008

Physics

High Energy Physics

High Energy Physics - Lattice

Fixed typos: normalisation of chi-squared, some operator projections in appendix, missing lattice irrep table

Scientific paper

10.1103/PhysRevD.77.034501

Working with a large basis of covariant derivative-based meson interpolating fields we demonstrate the feasibility of reliably extracting multiple excited states using a variational method. The study is performed on quenched anisotropic lattices with clover quarks at the charm mass. We demonstrate how a knowledge of the continuum limit of a lattice interpolating field can give additional spin-assignment information, even at a single lattice spacing, via the overlap factors of interpolating field and state. Excited state masses are systematically high with respect to quark potential model predictions and, where they exist, experimental states. We conclude that this is most likely a result of the quenched approximation.

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