and Leptonic Widths, and from full lattice QCD
Aug 25, 2014
22 pages
Published in:
- Phys.Rev.D 91 (2015) 7, 074514
- Published: Apr 23, 2015
e-Print:
- 1408.5768 [hep-lat]
PDG: -QUARK MASS
Citations per year
Abstract: (APS)
We determine the decay rate to leptons of the ground-state ϒ meson and its first radial excitation in lattice QCD for the first time. We use radiatively improved nonrelativistic QCD for the b quarks and include u, d, s and c quarks in the sea with u/d masses down to their physical values. We find Γ(ϒ→e+e-)=1.19(11) keV and Γ(ϒ′→e+e-)=0.69(9) keV, both in good agreement with experimental results. The decay constants we obtain are included in a summary plot of meson decay constants from lattice QCD given in the Conclusions. We also test time moments of the vector current-current correlator against values determined from the b-quark contribution to σ(e+e-→hadrons) and calculate the b-quark piece of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, aμb=0.271(37)×10-10. Finally we determine the b-quark mass, obtaining in the MS¯ scheme, m¯b(m¯b,nf=5)=4.196(23) GeV, the most accurate result from lattice QCD to date.Note:
- 21 pages, 15 figures
- 12.38.Gc
- 12.15.Ff
- 13.20.Gd
- 14.40.Pq
- leptonic decay
- vacuum polarization: hadronic
- muon: magnetic moment
- width: leptonic
- up: mass
- down: mass
References(67)
Figures(15)
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