Neutron electric dipole moment and probe of PeV scale physics

Abstract

The experimental limit on the neutron electric dipole moment is used as a possible probe of new physics beyond the standard model. Within MSSM we use the current experimental limit on the neutron EDM and possible future improvement as a probe of high scale SUSY. Quantitative analyses show that scalar masses as large as a PeV and larger could be probed in improved experiment far above the scales accessible at future colliders. We also discuss the neutron EDM as a probe of new physics models beyond MSSM. Specifically we consider an MSSM extension with a particle content including a vectorlike multiplet. Such an extension brings in new sources of charge conjugation and parity (CP) violation beyond those in MSSM. These CP phases contribute to the EDM of the quarks and to the neutron EDM. These contributions are analyzed in this work where we include the supersymmetric loop diagrams involving the neutralinos, charginos, the gluino, squark and mirror squark exchange diagrams at the one loop level. We also take into account the contributions from the W , Z, quark and mirror quark exchanges arising from the mixings of the vectorlike generation with the three generations. It is shown that the experimental limit on the neutron EDM can be used to probe such new physics models. In the future one expects the neutron EDM to improve an order of magnitude or more allowing one to extend the probe of high scale SUSY and of new physics models. For the MSSM the probe of high scales could go up to and beyond PeV scale masses.

Muon g − 2 and related phenomenology in constrained vector-like extensions of the MSSM

“…Besides (g −2) µ , it has been for instance pointed out that VL colored sparticles provide extra contributions to the Higgs boson mass [38][39][40][41][42][43], that VL quarks could possibly explain [44] the recently emerged ttH anomaly [45], and that VL superfields might ameliorate to some extent the fine tuning associated with large stops with respect to the MSSM [46]. On the observational side, it has been shown that signatures of extra VL matter can be tested in the next generation of experiments probing lepton flavor violating decays [47], electric and chromoelectric dipole moments [48,49], flavor violating Higgs decays [50] and rare meson decays.…”

Chromoelectric dipole moments of quarks in MSSM extensions

“…As a consequence the quark mass matrices are 5 × 5 and the squark mass squared matrices are 10 × 10 and this time we have also the dependence on the vectorlike mass M X . Thus the analysis of this work is more general than of the work of [23]. Gluino Mass, mg (TeV) Other parameters are the same as in Fig.…”

“…Again as in the case of CEDM we find that EDM also has a sensitive dependence on M X . We note here that the analysis of this work for EDM is more general than the analysis of [23]. Thus in [23] we considered only the mixings of the three generations with the mirror generation so that the quark matrices were 4 × 4 and the squark square matrices were 8 × 8 and the parameter M X did not appear in that work.…”

“…We note here that the analysis of this work for EDM is more general than the analysis of [23]. Thus in [23] we considered only the mixings of the three generations with the mirror generation so that the quark matrices were 4 × 4 and the squark square matrices were 8 × 8 and the parameter M X did not appear in that work. On the other hand, in this work we are considering mixing of the three generations with the full vectorlike generation consisting of the mirror and the sequential fourth generation.…”

“…For that reason they are interesting models to consider in the context of lepton and quark EDMs. In a recent work we analyzed the electric dipole operator in such a setting [23] and in this work we analyze the chromoelectric dipole operator in the extended MSSM model and its contribution to the electric dipole moments.…”