1303.4146 (Zhi-Gang Wang)

Next-to-leading order perturbative contributions in the QCD sum rules
for unequal quark masses    [PDF]

Zhi-Gang Wang

In this article, we assume that the two quarks have unequal masses and calculate the next-to-leading order contributions to the spectral densities of the two-point correlation functions of the vector, axial-vector, scalar and pseudoscalar currents. We take dimensional regularization to regularize both the ultraviolet and infrared divergences, and use optical theorem to obtain the spectral densities directly, furthermore, we present some necessary technical details for readers convenience. The analytical expressions are applicable in many phenomenological analysis besides the QCD sum rules.

View original: http://arxiv.org/abs/1303.4146