2014/08/31 by Bipasha Chakraborty, C. T. H. Davies, G. C. Donald +9
Physics and Astronomy · #Coupling (piping) #High-Energy Particle Collisions Research #Lattice QCD #Particle physics #Particle physics theoretical and experimental studies #Physics #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #hep-lat
paper · pdf · doi:10.1103/physrevd.91.054508
published as Phys. Rev. D 91, 054508 (2015) · 16 pages, 9 figures, 6 tables
arxiv created 2014/12/05 · openalex publication_date 2015/03/17 · arxiv updated 2015/03/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a new lattice QCD analysis of heavy-quark pseudoscalar-pseudoscalar correlators, using gluon configurations from the MILC collaboration that include vacuum polarization from u, d, s and c quarks (n f = 4).We extract new values for the QCD coupling and for the c quark's MS mass: MS (MZ , n f = 5) = 0.11822(74) and mc(3 GeV, n f = 4) = 0.9851(63) GeV.These agree well with our earlier simulations using n f = 3 sea quarks, vindicating the perturbative treatment of c quarks in that analysis.We also obtain a new nonperturbative result for the ratio of c and s quark masses: mc/ms = 11.652(65).This ratio implies ms(2 GeV, n f = 3) = 93.6(8)MeV when it is combined with our new c mass.Combining mc/ms with our earlier m b /mc gives m b /ms = 52.55(55),which is several standard deviations (but only 4%) away from the Georgi-Jarlskop prediction from certain GUTs.Finally we obtain an n f = 4 estimate for m b /mc = 4.528(54) which agrees well with our earlier n f = 3 result.The new ratio implies m b (m b , n f = 5) = 4.162(48) GeV.