Unitarity violation in non-abelian Pauli-Villars regularization

Details Unitarity violation in non-abelian Pauli-Villars regularization Unitarity violation in non-abelian Pauli-Villars regularization

1995-07-28

arxiv.org/abs/hep-ph/9507443v1

Phys.Lett. B355 (1995) 531-538

Physics

High Energy Physics

High Energy Physics - Phenomenology

plain LaTeX, 13 pages plus 3 figures in a uuencoded PS file

Scientific paper

10.1016/0370-2693(95)00757-C

We regularize QCD using the combination of higher covariant derivatives and Pauli-Villars determinants proposed by Slavnov. It is known that for pure Yang-Mills theory the Pauli-Villars determinants generate unphysical logarithmic radiative corrections at one loop that modify the beta function. Here we prove that when the gauge fields are coupled to fermions so that one has QCD, these unphysical corrections translate into a violation of unitarity. We provide an understanding of this by seeing that Slavnov's choice for the Pauli-Villars determinants introduces extra propagating degrees of freedom that are responsible for the unitarity breaking. This shows that Slavnov's regularization violates unitarity, hence that it should be rejected.

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