6533b7defe1ef96bd12768cd

RESEARCH PRODUCT

Radiative improvement of spin and Darwin terms in the NRQCD action

T. C. HammantA. G. HartG. M. Von HippelR. R. HorganC. J. Monahan

subject

High Energy Physics - LatticeHigh Energy Physics::LatticeHigh Energy Physics - Lattice (hep-lat)FOS: Physical sciences

description

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.

yearjournalcountryeditionlanguage
2012-12-12
http://arxiv.org/abs/1212.2849