Excited and exotic charmonium, $\textit{D}$$_{s}$ and $\textit{D}$ meson spectra for two light quark masses from lattice QCD

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Cheung, GKC 
O'Hara, C 
Peardon, M 
Ryan, SM 

We present highly-excited charmonium, Ds and D meson spectra from dynamical lattice QCD calculations with light quarks corresponding to Mπ ∼ 240 MeV and compare these to previous results with Mπ ∼ 400 MeV. Utilising the distillation framework, large bases of carefully constructed interpolating operators and a variational procedure, we extract and reliably identify the continuum spin of an extensive set of excited mesons. These include states with exotic quantum numbers which, along with a number with non-exotic quantum numbers, we identify as having excited gluonic degrees of freedom and interpret as hybrid mesons. Comparing the spectra at the two different Mπ , we find only a mild light-quark mass dependence and no change in the overall pattern of states.

lattice field theory simulation, QCD phenomenology
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Journal of High Energy Physics
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Science and Technology Facilities Council (ST/L000385/1)
STFC (1479806)
GC is supported by the Cambridge European Trust, the U.K. Science and Technology Facilities Council (STFC) and St. John's College, Cambridge. COH acknowledges support from the School of Mathematics at Trinity College Dublin. GM acknowledges support the Herchel Smith Fund at the University of Cambridge. SMR acknowledges support from Science Foundation Ireland [RFP-PHY-3201]. CET acknowledges support from the STFC [grant ST/L000385/1]. DT is supported by the Irish Research Council Government of Ireland Postgraduate Scholarship Scheme [grant GOIPG/2014/65]. For further information please visit the publisher's website.