Influence of Additional Fermions and Gauge Bosons on Re(ε'/epsilon)

الأصل · EN

The CP violation parameter Re(ε'/ε) has previously been calculated in the standard model and the result depends on the top quark mass in an exciting way. We consider how the result is modified in two specific extensions of the standard model. The first adds only fermions, an extra vector-like quark doublet, and tends to reduce Re(ε'/ε). The second contains three extended families with the third family treated differently and additional gauge bosons - the 331 model - and can accommodate larger values of Re(ε'/ε) for a given mₜ. When the experimental values of mₜ and Re(ε'/ ε) are known more accurately, it will allow discrimination between theories. If the lower experimental number Re(ε'/ε) = (0.74 ± 0.60) × 10⁻³ (Fermilab, E731) is confirmed and mₜ is near the value 175GeV the standard model is acceptable. But, if the higher value Re(ε'/ε) = (2.3 ± 0.65) × 10⁻³ (CERN, NA31) persists, a dynamics like the 331 model where the third family is treated differently from the first two and there exist additional gauge bosons seems to be favored.