Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-21
Nucl.Phys.B504:61-107,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
57 pages, extended version, many typos corrected and new remarks added for clarity. Version to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(97)00469-0
We analyze CP violation in resonant transitions involving scalar as well as fermionic intermediate states, using a gauge-invariant resummation approach implemented by the pinch technique. We derive the necessary conditions for resonantly enhanced CP violation induced by particle mixing, by paying special attention to CPT invariance, and apply the results of our analysis to two representative new-physics scenarios: (i) the indirect mixing of a CP-even Higgs scalar with a CP-odd Higgs particle in two-Higgs doublet models and (ii) the CP-asymmetric mixing between the top quark and a new heavy up-type quark, $t'$, in mirror fermion models. Furthermore, we explicitly demonstrate the equivalence of our scattering-amplitude formalism with that based on the effective Hamiltonian and discuss the possibility of maximal CP violation in the limiting case of two degenerate particles.
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