1110.5581 (A. Maier et al.)

Low- and High-Energy Expansion of Heavy-Quark Correlators at
Next-To-Next-To-Leading Order    [PDF]

A. Maier, P. Marquard

We calculate three-loop corrections to correlation functions of heavy-quark
currents in the low- and high-energy regions. We present 30 coefficients both
in the low-energy and the high-energy expansion of the scalar and the vector
correlator with non-diagonal flavour structure. In addition we compute 30
coefficients in the high-energy expansion of the diagonal vector, axial-vector,
scalar and pseudo-scalar correlators. Possible applications of our new results
are improvements of lattice-based quark-mass determinations and the approximate
reconstruction of the full momentum dependence of the correlators.

View original: http://arxiv.org/abs/1110.5581