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A New Evaluation of the Parity Violating Pion - Nucleon Coupling

Authors
  • Buccella, F.
  • Lusignoli, Maurizio
  • Maiani, L.
  • Pugliese, A.
Publication Date
Jan 01, 1979
Identifiers
DOI: 10.1016/0550-3213(79)90092-0
OAI: oai:inspirehep.net:7346
Source
INSPIRE-HEP
Keywords
License
Unknown
External links

Abstract

We evaluate the parity violating pion-nucleon coupling, A π , in the framework of the standard model of weak and electromagnetic interactions, including QCD corrections. We point out that important contributions to A π have been overlooked previously. Taking into account the uncertainties in the determination of the coefficients of the effective Hamiltonian, we find A π = (16–29) ( A π ) C , where ( A π ) C is the prediction of the Cabibbo theory, related to hyperon decay S-wave amplitudes. The sign of A π with respect to the strong pion-nucleon coupling is also determined.

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