B meson excitations with chirally improved light quarks

Abstract

We present our latest results for the excitations of static-light mesons on both quenched and unquenched lattices, where the light quarks are simulated using the chirally improved (CI) lattice Dirac operator.

The continuum limit of the static-light meson spectrum

“…For the lightest sea quark mass considered in [12] corresponding to m PS ≈ 461 MeV it is most appropriate to compare with our results at β = 3.90, µ q = 0.0100 (m PS ≈ 517 MeV). For the P wave mass differences one finds (m(P − ) − m(S)) ETMC (m(P − ) − m(S)) [12] ≈ 474(29) MeV 454(19)(9) MeV ≈ 1.04 (11)…”

“…The static-light meson spectrum has been studied comprehensively by lattice methods in the quenched approximation with a rather coarse lattice spacing [5]. Lattice studies with N f = 2 flavours of dynamical sea quarks have also explored this spectrum [6,7,8,9,10,11,12]. Here following our initial study [13,14], we use N f = 2 flavours and are able to reach lighter dynamical quark masses, which are closer to the physical u/d quark mass, so enabling a more reliable extrapolation.…”