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Renormalization of the flavor-changing neutral currents

J. M. Soares and A. Barroso

  • Centro de Física Nuclear, Universidade de Lisboa, Av. Gama Pinto 2, 1699 Lisboa, Portugal

Phys. Rev. D 39, 1973 – Published 1 April, 1989

DOI: https://doi.org/10.1103/PhysRevD.39.1973

Abstract

The flavor-changing amplitudes γqiqj and Zqiqj are computed for off-shell particles and without approximations. The calculations are done in the ’t HooftFeynman gauge, and the on-shell renormalization scheme is used. The Ward-Slavnov-Taylor identities are derived and used to check the results. Putting the external quarks on shell, we found that the corresponding flavor-changing S-matrix elements are not renormalized, i.e., the sum of all counterterms vanishes. Using the renormalization scheme proposed by Sirlin the meaning of this cancellation is clarified.

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