A realistic formulation of approximate CP

Details A realistic formulation of approximate CP A realistic formulation of approximate CP

2002-06-09

arxiv.org/abs/hep-ph/0206086v3

Nucl.Phys. B652 (2003) 142-164

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 2 tables v3: improved notation and discussion of 'removability' v2: revised discussion of USY, improved notation of

Scientific paper

10.1016/S0550-3213(03)00005-1

CP violation in the SM is naturally implemented as a small imaginary perturbation to real Yukawa couplings. For example, a large CP asymmetry in B_d decays can arise if the imaginary parts of quark mass matrices are of order 10^(-3)m_t,b or smaller. Applying the same principle of ``additive CP violation'' to soft SUSY-breaking terms, the electric dipole moments of the neutron and mercury atom are predicted near current experimental limits; for nonuniversal A-terms, EDM bounds can be satisfied given certain flavour structures. The proposal is conveniently formulated in a democratic basis, with Yukawas and soft terms of the form const. x (1+eps+i zeta) where eps<<1, zeta<~10^(-3), motivated by approximate permutation x CP symmetry.

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