Precise heavy-light meson masses and hyperfine splittings from lattice QCD including charm quarks in the sea

By R. Dowdall, C. Davies, T. Hammant, R. Horgan. 2012

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We present improved results for the B and D meson spectrum from lattice QCD including the effect of u/d, s and c quarks in the sea. For the B mesons the highly improved staggered quark action is used for the sea and light valence quarks and nonrelativistic QCD for the b quark including O(αs) radiative corrections to many of the Wilson coefficients for the first time. The D mesons use the highly improved staggered quark action for both valence quarks on the same sea. We find MBs-MB=84(2)  MeV, MBs=5.366(8)  GeV, MBc=6.278(9)  GeV, MDs=1.9697(33)  GeV, and MDs-MD=101(3)  MeV. Our results for the B meson hyperfine splittings are MB*-MB=50(3)  MeV, MBs*-MBs=52(3)  MeV, in good agreement with existing experimental results. This demonstrates that our perturbative improvement of the nonrelativistic QCD chromomagnetic coupling works for both heavyonium and heavy-light mesons. We predict MBc*-MBc=54(3)  MeV. We also present first results for the radially excited Bc states as well as the orbitally excited scalar Bc0* and axial-vector Bc1 mesons.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/09b604c18a1f4d1aa93b131c8e61164686221fdb

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In Nuclear and High Energy Physics

  1. A. Nefediev
  2. Cheng-ping Shen
  3. A. Vairo
  4. S. Eidelman
  5. Christopher E. Thomas
  6. C. Hanhart
  7. N. Brambilla
  8. C. Yuan

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