Radiative improvement of spin and Darwin terms in the NRQCD action
High Energy Physics - Lattice
2012-12-13 v1
Abstract
We present updated results for the radiative improvement of the \sigma.B term and the spin-dependent four-fermion terms in the lattice NRQCD action, and first results for the radiative corrections to the NRQCD Darwin term and spin-independent four-fermion terms. The spin-dependent terms have significant impact on getting the correct hyperfine splitting for both bottomonium and heavy-light mesons, while the spin-independent terms suffer from a conspiracy between lattice artifacts and severe IR divergences that complicates their evaluation.
Keywords
Cite
@article{arxiv.1212.2849,
title = {Radiative improvement of spin and Darwin terms in the NRQCD action},
author = {T. C. Hammant and A. G. Hart and G. M. von Hippel and R. R. Horgan and C. J. Monahan},
journal= {arXiv preprint arXiv:1212.2849},
year = {2012}
}
Comments
7 pages, 3 pdf figures; proceedings of 30th International Symposium on Lattice Field Theory, June 24-29, 2012, Cairns, Australia