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Unitarity Violation in non-Abelian Pauli-Villars Regularization

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Ruíz Ruíz, Fernando and León, J.H. and Martín, C.P. (1995) Unitarity Violation in non-Abelian Pauli-Villars Regularization. Physics Letters B, 355 . pp. 531-538. ISSN 0370-2693

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Official URL: http://dx.doi.org/10.1016/0370-2693(95)00757-C




Abstract

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 showing 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.


Item Type:Article
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©1995 Elsevier Science B.V. All rights reserved.

Uncontrolled Keywords:Simons
Subjects:Sciences > Physics
ID Code:25194
Deposited On:29 Apr 2014 11:50
Last Modified:29 Apr 2014 11:55

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