New Constraint on Squark Flavor Mixing from 199Hg Electric Dipole Moment

Details New Constraint on Squark Flavor Mixing from 199Hg Electric Dipole Moment New Constraint on Squark Flavor Mixing from 199Hg Electric Dipole Moment

2003-11-06

arxiv.org/abs/hep-ph/0311072v3

Phys.Lett. B583 (2004) 186-191

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, comments added

Scientific paper

10.1016/j.physletb.2003.12.075

A new constraint is obtained on the CP-violating flavor mixing between the left-handed top scalar quark (\tilde{t}_L) and charm scalar quark (\tilde{c}_L), by considering a chargino loop contribution to chromo-electric dipole moment of strange quark, which is limited by the electric dipole moment of the ^{199}Hg atom. It is found that the flavor mixing should be suppressed to the level of {\cal O}(0.1) for the CP phase of order unity, when \tan \beta is relatively large and sparticle masses lie in a few hundred GeV range. Although it is much stronger than the known constraint from the chargino loop contribution to b \to s \gamma, the moderate constraint we obtain here is argued to leave room for sizable supersymmetric contribution to the CP asymmetry in B_d^0 \to \phi K_s.

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