The chromoelectric and purely gluonic operator contributions to the neutron electric dipole moment in N=1 supergravity

Abstract

A complete one loop analysis of the chromoelectric dipole contribution to the electric dipole moment (edm) of the quarks and of the neutron in N=1 supergravity including the gluino, chargino and neutralino exchange contributions and exhibiting the dependence on the two CP violating phases allowed in the soft SUSY breaking sector of minimal supergravity models is given. It is found that in significant parts of the supergravity parameter space the chromoelectric dipole contribution to the neutron edm is comparable to the contribution from the electric dipole term and can exceed the contribution of the electric dipole term in certain regions of the parameter space. An analysis of the contribution of Weinberg's purely gluonic CP violating dimension six operator within supergravity unification is also given. It is found that this contribution can also be comparable to the contribution from the electric dipole term in certain regions of the supergravity parameter space.

Electron and neutron electric dipole moments in the constrained MSSM

“…In the following we give the complete analytic expressions for the individual one-loop contributions. We have compared our results with [9,11] and found agreement.…”

“…The leading nontrivial contribution to d G in the MSSM is given by a two-loop diagram involving top, scalar top, and gluino [9,17]:…”

Neutron electric dipole moment and probe of PeV scale physics

“…This phenomenon is often referred to as the SUSY EDM problem. Several solutions to this problem have been suggested in the past such as small CP phases [5], mass suppression [6] and the cancellation mechanism [7,8] where various diagrams contributing to the EDMs cancel to bring the predicted EDM below the experimental value (for an alternate possibility see [9]). …”

Effects ofCPphases onBs,d0→l+Ibrahim1, Nath2 2003Phys. Rev. DSelf Cite58060View full textAdd to dashboardCite

“…An important constraint on models with CP violation is that of the experimental limits on the electron and on the neutron electric dipole moments (edms)(d e < 4.3 × 10 −27 ecm [13], d n < 6.5 × 10 −26 ecm [14]). These constraints can be satisfied in a variety of ways [15,16,17,18,19]. The limit on the edm of H 199 g is also known to a high degree of accuracy (d Hg < 9×10 −28 ecm [20]) and recent analyses have also included this constraint [21].…”

“…The limit on the edm of H 199 g is also known to a high degree of accuracy (d Hg < 9×10 −28 ecm [20]) and recent analyses have also included this constraint [21]. Specifically in scenarios with the cancellation mechanism [18] and in scenario with phases only in the third generation [19] one can accommodate large CP violating phases and their inclusion can affect supersymmetric phenomena in a very significant way. In this work we will focus on the contribution from the so called counter term diagram (Fig.1) which gives an amplitude proportional to tan 3 β for large tan β.…”