Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2007-08-21
Phys.Rev.D78:074509,2008
Physics
High Energy Physics
High Energy Physics - Lattice
35 pages. v3: Data from two new lattices added. New results in several chapters
Scientific paper
10.1103/PhysRevD.78.074509
This is a follow-up to our earlier work on the energies and radial distributions of heavy-light mesons. The heavy quark is taken to be static (infinitely heavy) and the light quark has a mass about that of the strange quark. We now concentrate on the energies of the excited states with higher angular momentum and with a radial node. A new improvement is the use of hypercubic blocking in the time direction. The calculation is carried out with dynamical fermions on a 16 cubed times 32 lattice with a lattice spacing approximately 0.1 fm generated using a non-perturbatively improved clover action. In nature the closest equivalent of this heavy-light system is the B_s meson, which allows us to compare our lattice calculations to experimental results (where available) or to give a prediction where the excited states, particularly P-wave states, should lie. We pay special attention to the spin-orbit splitting, to see which one of the states (for a given angular momentum L) has the lower energy. An attempt is made to understand these results in terms of the Dirac equation.
Koponen Jonna
UKQCD Collaboration
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