Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-28
Eur.Phys.J.C47:95-112,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 3 figures
Scientific paper
10.1140/epjc/s2006-02546-2
The gauge-invariance properties and singularity elimination of the modified perturbation theory for QCD introduced in previous works, are investigated. The construction of the modified free propagators is generalized to include the dependence on the gauge parameter $\alpha $. Further, a functional proof of the independence of the theory under the changes of the quantum and classical gauges is given. The singularities appearing in the perturbative expansion are eliminated by properly combining dimensional regularization with the Nakanishi infrared regularization for the invariant functions in the operator quantization of the $\alpha$-dependent gauge theory. First-order evaluations of various quantities are presented, illustrating the gauge invariance-properties.
Cabo Alejandro
Rigol Marcos
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