Heavy quark expansion parameters from lattice NRQCD

Details Heavy quark expansion parameters from lattice NRQCD Heavy quark expansion parameters from lattice NRQCD

2003-05-30

arxiv.org/abs/hep-lat/0305024v1

Phys.Rev. D69 (2004) 094512

Physics

High Energy Physics

High Energy Physics - Lattice

REVTeX4, 45 pages, 37 eps figures

Scientific paper

10.1103/PhysRevD.69.094512

We present a lattice QCD calculation of the heavy quark expansion parameters $\mu_{\pi}^2$ and $\mu_G^2$ for heavy-light mesons and heavy-light-light baryons. The calculation is carried out on a 20$^3\times$48 lattice at $\beta$ = 6.0 in the quenched approximation, using the lattice NRQCD action for heavy quarks. We obtain the parameters $\mu_{\pi}^2$ and $\mu_G^2$ in two different methods: a direct calculation of the matrix elements and an indirect calculation through the mass spectrum, and confirm that the both methods give consistent results. We also discuss an application to the lifetime ratios.

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