Massive Fermions in Lattice Gauge Theory

Abstract

This paper presents a formulation of lattice fermions applicable to all quark masses, large and small. We incorporate interactions from previous light-fermion and heavy-fermion methods, and thus ensure a smooth connection to these limiting cases. The couplings in improved actions are evaluated for arbitrary fermion mass~$m_q$, without expansions around small- or large-mass limits. We treat both the action and external currents. By interpreting on-shell improvement criteria through the lattice theory's Hamiltonian, one finds that cutoff artifacts factorize into the form $b_n(m_qa)[\vek{p}a]^{s_n}$, where $\vek{p}$ is a momentum characteristic of the system under study, $s_n$ is related to the dimension of the $n$th interaction, and $b_n(m_{q}a)$ is a bounded function, numerically always~$\order(1)$ or less. In heavy-quark systems $\vek{p}$ is typically rather smaller than the fermion mass~$m_q$. Therefore, artifacts of order $(m_{q}a{)}^s$ do not arise, even when $m_qa\gsim1$. An important by-product of our analysis is an interpretation of the Wilson and Sheikholeslami-Wohlert actions applied to nonrelativistic fermions.

54 pages; 5 files for figures, 4 for tables, 2 for macros (all included); PostScript also at http://www-theory.fnal.gov/people/ask/TeX/heavy/theory.ps.gz

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• Non-perturbative renormalization of lattice QCD at all scales
• Properties of B-Mesons in Lattice QCD
• Radiative Corrections to the Kinetic Couplings in Nonrelativistic Lattice QCD
• Tadpole-Improved Perturbation Theory for Heavy-Light Lattice Operators

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