Abstract

We perform a global fit using results of searches for electric dipole moments (EDM) of diamagnetic systems within the context of the minimal left-right symmetric model. In this way, we disentangle the new “left-right” electroweak and θ¯ contributions that cannot be separated using a single EDM system. Although the fit is done for a specific model, the approach can be applied to any particle physics model. Finally, we revisit the constraint on the D coefficient in β-decay and find that current EDM bounds do not preclude observation of this T-violating effect in a possible next generation β-decay experiment.

Highlights

  • The Standard Model (SM) of fundamental interactions contains two sources of CP violation (CPV): the θparameter and the phase δ in the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix

  • We show that present electric dipole moment (EDM) constraints would allow for observation of a non-zero effect in a future experiment performed with improved sensitivity, with a magnitude larger than the uncertainty in the pseudo-T-odd contribution from final state interactions

  • We found that the “sole-source” limit of θ 10−10 gets relaxed by roughly one order of magnitude from our global analysis

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Summary

Introduction

The Standard Model (SM) of fundamental interactions contains two sources of CP violation (CPV): the θparameter and the phase δ in the Cabibbo-Kobayashi-Maskawa (CKM) mixing matrix. Θis a calculable parameter, leaving only Im(C j)/ 2 is the a priori unknown quantity This is not the case in general – including the case of the SM – since there is no way of disentangling the θ0 contribution from the radiative corrections giving rise to arg det(Mu Md). We show that present EDM constraints would allow for observation of a non-zero effect in a future experiment performed with improved sensitivity, with a magnitude larger than the uncertainty in the pseudo-T-odd contribution from final state interactions. Our discussion of this analysis is organized as follows.

EDM of hadronic and atomic systems
The minimal left-right symmetric model
The strong CP problem in the minimal LR symmetric model
Interplay with time-reversal symmetry violation in β-decays
Findings
Conclusions
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