Restoration of Rotational Symmetry in the Continuum Limit of Lattice Field Theories

Details Restoration of Rotational Symmetry in the Continuum Limit of Lattice Field Theories Restoration of Rotational Symmetry in the Continuum Limit of Lattice Field Theories

2012-04-18

arxiv.org/abs/1204.4146v1

Physics

High Energy Physics

High Energy Physics - Lattice

35 pages, 10 figures

Scientific paper

We explore how rotational invariance is systematically recovered from calculations on hyper-cubic lattices through the use of smeared lattice operators that smoothly evolve into continuum operators with definite angular momentum as the lattice-spacing is reduced. Perturbative calculations of the angular momentum violation associated with such operators at tree-level and at one-loop are presented in phi^4 theory and QCD. Contributions from these operators that violate rotational invariance occur at tree-level, with coefficients that are suppressed by O(a^2) in the continuum limit. Quantum loops do not modify this behavior in phi^4, nor in QCD if the gauge-fields are smeared over a comparable spatial region. Consequently, the use of this type of operator should, in principle, allow for Lattice QCD calculations of the higher moments of the hadron structure functions.

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