New physics in the chromomagnetic flavor changing transition s ! dg0 can avoid the strong Glashow- Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the 0 parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for 0 as a function of the short-distance coefficients for a wide class of models of new physics is given.

New physics in the chromomagnetic flavor changing transition s→dg∗ can avoid the strong Glashow-Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the ϵ′ parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for ϵ′ as a function of the short-distance coefficients for a wide class of models of new physics is given.

New physics in ϵ′ from gluomagnetic contributions and limits on Left-Right symmetry

NESTI, FABRIZIO
2012-01-01

Abstract

New physics in the chromomagnetic flavor changing transition s→dg∗ can avoid the strong Glashow-Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the ϵ′ parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for ϵ′ as a function of the short-distance coefficients for a wide class of models of new physics is given.
2012
http://dx.doi.org/10.1103/PhysRevD.86.095013
New physics in the chromomagnetic flavor changing transition s ! dg0 can avoid the strong Glashow- Iliopoulos-Maiani suppression of the standard model and lead to large contributions to CP-violating observables, in particular to the 0 parameter, that we address here. We discuss the case of the left-right symmetric models, where this contribution implies bounds on the phases of the right-handed quark mixing matrix, or in generic models with large phases a strong bound on the left-right symmetry scale. To the leading order, a numeric formula for 0 as a function of the short-distance coefficients for a wide class of models of new physics is given.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2900779
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