Vector-like fermion contributions to ε′

del Aguila, F.; Chase, M.K.; Cortes, J.

doi:10.1016/S0550-3213(86)80004-9

Vector-like fermion contributions to ε′

Jul, 1985

19 pages

Published in:

Nucl.Phys.B 271 (1986) 61-79,
Nucl.Phys.B 271 (1986) 61-79

Published: Aug 7, 2006
and
Published: 1986

DOI:

10.1016/S0550-3213(86)80004-9 (publication),
10.1016/0550-3213(86)90354-8

Report number:

CERN-TH-4225/85

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Abstract: (Elsevier B.V.)

We consider extensions to the standard electroweak model which contain new vector-like fermions at the Fermi scale as a source of CP violation. After a detailed calculation of the QCD corrections to leading order, we find that the new contributions to |ε′/ε| range typically from 10⁻³ to 10⁻² when we require that the corresponding contributions to ε saturate its experimental value. If, for instance, a new vector-like down-quark exists at the Fermi scale |ε′/ε| is predicted to be ~2 × 10⁻³. These results are within the range of sensitivity of presently planned experiments.

ELECTROWEAK INTERACTION: MODEL
MODEL: ELECTROWEAK INTERACTION
FERMION: VECTOR
FERMION: POSTULATED PARTICLE
CP: violation
QUANTUM CHROMODYNAMICS: CORRECTION
APPROXIMATION: LEADING LOGARITHM
FIELD THEORY: EFFECTIVE HAMILTONIANS
SELECTION RULE: STRANGENESS

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