Asymptotic freedom using a gluon mass as a regulator
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EPJ Web of Conferences 274, 02006 (2022) [https://doi.org/10.1051/epjconf/202227402006]
SponsorshipFEDER funds, project ref. A-FQM-406-UGR20; MCIN/ AEI/10.13039/501100011033; Project Ref. PID2020-114 767GB-I00
Front-Form Hamiltonian dynamics provides a framework in which QCD’s vacuum is simple and states are boost invariant. However, canonical expressions are divergent and must be regulated in order to establish well-defined eigenvalue problems. The Renormalization Group Procedure for Effective Particles (RGPEP) provides a systematic way of finding counterterms and obtaining regulated Hamiltonians. Among its achievements is the description of asymptotic freedom, with a running coupling constant defined as the coefficient in front of the three gluon-vertex operators in the regulated Hamiltonian. However, the obtained results need a deeper understanding, since the coupling exhibits a finite dependence on the regularization functions, at least at the third-order term in the perturbative expansion. Here we present a similar derivation using a different regularization scheme based on massive gluons. The procedure can be extended to incorporate contributions from virtual fermions.