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Optimising creation operators for charmonium spectroscopy on the lattice
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Smearing the bare quantum fields in lattice calculations before applying composite hadron creation operators has a long record of substantially improving overlaps onto low-lying energy eigenstates. A technique called distillation which defines smearing for quark fields as a low-rank linear projection operator into a small vector space of smooth gauge-covariant fields has proven to be both effective and versatile in hadron spectroscopy calculations albeit with significant computational cost . In this paper, more general operators in this space of smooth fields are introduced and optimised, which enhances the performance of the method when tested on systems of heavy quark-anti-quark pairs close to the charmonium energy scale.
Forward citations
Cited by 5 Pith papers
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Optimising stochastic algorithms for hadron correlation function computations in lattice QCD using a localised distillation basis
A new localised basis for lattice QCD distillation, generated by a unitary-flow orthogonalisation, enables sparse importance-sampled contractions of baryon correlation functions.
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Flavor mixing in charmonium and light mesons with optimal distillation profiles
In two lattice QCD ensembles, flavor-singlet charmonium and light-meson operators mix with each other and with gluonic operators, and adding a two-pion operator reveals an additional low-lying state.
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Spectral analysis for nucleon-pion and nucleon-pion-pion states in both parity sectors using distillation with domain-wall fermions
A distillation-based GEVP analysis resolves nucleon, nucleon-pion, and, for the first time, nucleon-pion-pion states in lattice QCD, with a physical-point nucleon mass of 0.927(21)(05) GeV.
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Mixing of heavy and light quarks in charmonium and light mesons
The abstract claims lattice QCD shows mixing among light scalar mesons, charmonium, and glueballs, but the supplied manuscript body is a different paper, so the claim is unverifiable from the submission.
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Static-light meson spectroscopy with optimal distillation profiles
Profile-weighted distillation reduces excited-state contamination for static-light and static-charm mesons and yields new spectra and mass splittings on two N_f = 3+1 QCD ensembles.
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