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

Dowdall, R.J., Davies, C.T.H. , Hammant, T.C. and Horgan, R.R. (2012) Precise heavy-light meson masses and hyperfine splittings from lattice QCD including charm quarks in the sea. Physical Review D, 86(9), 094510. (doi: 10.1103/PhysRevD.86.094510)

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Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dowdall, Dr Rachel and Davies, Professor Christine
Authors: Dowdall, R.J., Davies, C.T.H., Hammant, T.C., and Horgan, R.R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
Published Online:12 November 2012

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