Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1997-06-02
Phys.Lett. B408 (1997) 308-314
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, LaTeX2e , 4 figures, uses styles [11pt, a4wide, epsf]. A minor typo in figure 2 has been corrected
Scientific paper
We explore the effect of higher order operators in the non-relativistic formulation of QCD (NRQCD). We calculated masses in the b \bar b spectrum using quenched gauge configurations at beta = 6.0 and two different NRQCD actions which have been corrected to order mv^4 and mv^6. The two-point functions are calculated in a gauge invariant fashion. We find the general structure of the spectrum to be the same in the two cases. Using the P - 3S1 splitting we determine the inverse lattice spacings to be 2.44(4) GeV and 2.44(5) GeV for the mv^4 and mv^6 actions, respectively. We do observe shifts in the spin splittings. The hyperfine splitting is reduced by approximately 4 MeV, while the fine splitting is down by up to 10 MeV, albeit with large statistical errors.
Drummond Ian T.
Horgan Ronald R.
Manke Thomas
Shanahan H. P.
UKQCD Collaboration
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