Consistency of Loop Regularization Method and Divergence Structure of QFTs Beyond One-Loop Order

Abstract

We study the problem how to deal with tensor-type two-loop integrals in the Loop Regularization (LORE) scheme. We use the two-loop photon vacuum polarization in the massless Quantum Electrodynamics (QED) as the example to present the general procedure. In the processes, we find a new divergence structure: the regulated result for each two-loop diagram contains a gauge-violating quadratic harmful divergent term even combined with their corresponding counterterm insertion diagrams. Only when we sum up over all the relevant diagrams do these quadratic harmful divergences cancel, recovering the gauge invariance and locality.

33 pages, 5 figures, Sub-section IIIE removed, to be published in EPJC

References in corpus (1)

• Consistency and Advantage of Loop Regularization Method Merging with Bjorken-Drell's Analogy Between Feynman Diagrams and Electrical Circuits

Cited by in corpus (5)

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• Quantum Structure of Field Theory and Standard Model Based on Infinity-free Loop Regularization/Renormalization
• Quadratic Contributions of Softly Broken Supersymmetry in the Light of Loop Regularization
• Advances towards the systematization of calculations with Implicit Regularization