Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-05-20
Phys.Rev.D78:054513,2008
Physics
High Energy Physics
High Energy Physics - Lattice
12 pages, 5 figures, 5 tables
Scientific paper
10.1103/PhysRevD.78.054513
We use lattice QCD simulations, with MILC gluon configurations and HISQ c-quark propagators, to make very precise determinations of moments of charm-quark pseudoscalar, vector and axial-vector correlators. These moments are combined with new four-loop results from continuum perturbation theory to obtain several new determinations of the MSbar mass of the charm quark and of the MSbar coupling. We find m_c(3GeV)=0.986(10)GeV, or, equivalently, m_c(m_c)=1.268(9)GeV, both for n_f=4 flavors; and alpha_msb(3GeV,n_f=4)=0.251(6), or, equivalently, alpha_\msb(M_Z,n_f=5)=0.1174(12). The new mass agrees well with results from continuum analyses of the vector correlator using experimental data for e+e- annihilation (instead of using lattice QCD simulations). These lattice and continuum results are the most accurate determinations to date of this mass. Ours is also one of the most accurate determinations of the QCD coupling by any method.
Allison Ian
Chetyrkin K. G.
Dalgic Emel
Davies Christine. T. H.
Follana Eduardo
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