We compute the virtual O(αs n 2 f ) corrections to the heavy quark vector current correlator in terms of expansions in the external momentum and as an exact numerical solution. As a byproduct, the available high-energy expansion at the three-loop level is extended.

In brane inflationary scenarios, the cosmological perturbations are supposed to originate from the vacuum fluctuations of the inflaton field corresponding to the position of the brane. We show that a significant, and possibly dominant, contribution to the curvature perturbation is generated at the end of inflation through the vacuum fluctuations of fields, other than the inflaton, which are lig...

The decay widths of the 0++ and 1−+ heavy-light hybrids to B(D) and pion are calculated by using the QCD sum rules. The interpolated current of the hybrid is chosen as gq̄γαG a αμT hv (x). In order to avoid the infrared problem, a two point correlation function between the pion and vacuum instead of the three point correlation function between the vacuum is used. We also keep the leading order o...

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This is the first of a series of papers devoted to a systematic study of QCD correlation functions in a framework of 'instanton vacuum' models. The topic of this paper is to work out approximate formulae for quark propagators in a multi-instanton environment. As an application, and also as a necessary step toward understanding the correlation functions, we study the propagators of scalar and sp...

Goat mince was packed and stored at 4 18C. Mince was analysed physico-chemically and microbiologically at intervals 0, 3, 7, 10, 21 and 28 days for packs stored aerobically and 7, 14, 21, 28 and 40 days for vacuum packs. Although the initial pH of mince was 6.5, meat pH and extract release volume declined during vacuum storage. The microbial pro®le of aerobically stored mince was signi®cantly h...

Using the Cornwall–Jackiw–Tomboulis effective potential for composite operators we compute the QCD vacuum energy as a function of the dynamical quark and gluon propagators, which are related to their respective condensates as predicted by the operator product expansion. The identification of this result to the vacuum energy obtained from the trace of the energymomentum tensor allow us to study ...