Constraints on CP violation in the Higgs sector from the $ρ$ parameter

Details Constraints on CP violation in the Higgs sector from the $ρ$ parameter Constraints on CP violation in the Higgs sector from the $ρ$ parameter

1993-05-15

arxiv.org/abs/hep-ph/9305272v1

Nucl.Phys.B413:3-15,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 2 figures (not included), SLAC-PUB-6196

Scientific paper

10.1016/0550-3213(94)90611-4

We discuss the relation between the CP symmetry and the custodial $SU(2)$ symmetry in the Higgs sector. In particular, we show that CP violation in the Higgs-gauge sector is allowed only if the custodial $SU(2)$ symmetry is broken. We exploit these facts to constrain CP violation using the experimental bounds on $\rho-1$. CP nonconservation in the Higgs-fermion interactions can also be constrained in a similar way although a possible exception is pointed out.

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