Mesonic decay constants in lattice NRQCD

Details Mesonic decay constants in lattice NRQCD Mesonic decay constants in lattice NRQCD

1998-12-08

arxiv.org/abs/hep-lat/9812008v1

Phys.Rev. D60 (1999) 014502

Physics

High Energy Physics

High Energy Physics - Lattice

25 pages in REVTeX

Scientific paper

10.1103/PhysRevD.60.014502

Lattice NRQCD with leading finite lattice spacing errors removed is used to calculate decay constants of mesons made up of heavy quarks. Quenched simulations are done with a tadpole improved gauge action containing plaquette and six-link rectangular terms. The tadpole factor is estimated using the Landau link. For each of the three values of the coupling constant considered, quarkonia are calculated for five masses spanning the range from charmonium through bottomonium, and one set of quark masses is tuned to the B(c). "Perturbative" and nonperturbative meson masses are compared. One-loop perturbative matching of lattice NRQCD with continuum QCD for the heavy-heavy vector and axial vector currents is performed. The data are consistent with the vector meson decay constants of quarkonia being proportional to the square root of their mass and the B(c) decay constant being equal to 420(13) MeV.

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