Renormalization of the Flavor Changing Neutral Currents

Jul 11, 1988
41 pages
Published in:
  • Phys.Rev.D 39 (1989) 1973
Report number:
  • IFM-17-88

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Abstract: (APS)
The flavor-changing amplitudes γqiqj and Zqiqj are computed for off-shell particles and without approximations. The calculations are done in the ’t Hooft–Feynman 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.
  • NEUTRAL CURRENT: FLAVOR CHANGING
  • RENORMALIZATION: ON-SHELL
  • GAUGE FIELD THEORY: WARD IDENTITY
  • GAUGE FIELD THEORY: SLAVNOV IDENTITY
  • FEYNMAN GRAPH: HIGHER-ORDER