CPCP violation in minimal supersymmetric standard model

$CP$ violating phenomena predicted by the minimal supersymmetric standard model are discussed in a case where the $CP$ violating phases in SUSY sector are not suppressed. The electric dipole moments of the neutron and the electron are large, but can be smaller than their experimental upper bounds if the scalar quarks and leptons are heavier than a few TeV. $T$ violating asymmetries in the production processes of the different neutralino pair and the different chargino pair emerge at the tree level. They could be as large as of order $10^{-2}$ in unpolarized electron beam experiments and $10^{-1}$ in polarized electron beam experiments. In a pair production of the charginos of the same mass, the asymmetry emerges through the electric and the weak "electric" dipole moments of the charginos at the loop level, but its magnitude is at most of order $10^{-4}$.Comment: 7 pages with 7 figures, TKU-HEP 94/02; IFM 2/94, LaTeX with Elsevir Science Publisher's style file, espcrc2.sty. (To appear in the proceedings of the Third KEK Topical Conference on CP Violation, November 1993) Figures are not included. The complete PostScript file can be obtained by anonymous ftp from ape.sp.u-tokai.ac.jp in the directr

{\it T}--odd Asymmetry in Chargino Pair Production Processes

$T$--violating asymmetry in chargino pair production processes is studied in the Minimal Supersymmetric Standard Model. The asymmetry emerges at the tree level in the production of two different charginos,and could be as large as of order $10^{-2}$ in unpolarized electron beam experiments and $10^{-1}$ in polarized electron beam experiments. In the pair production of the same charginos, the asymmetry emerges through the electric and the weak "electric" dipole moments of the charginos at the loop level. Its magnitude is of order $10^{-4}$. The consistency with the electric dipole moments of the neutron and the electron is also discussed.Comment: 10 pages with two ps-figures, IFM 11/93 TKU-HEP 93/06, Plain TeX, Uuencoded figures are appended. ( To appear in the proceedings of the Workshop on $e^+e^-$ Collisions at 500 GeV.

Effect on the electron EDM due to abelian gauginos in SUSY extra U(1) models

The electric dipole moment of an electron (EDME) is investigated in the supersymmetric extra U(1) models. Neutralino sector is generally extended in these models and then the neutralino contribution will be important for the analysis of the EDME. Kinetic term mixings of abelian gauginos are taken into account in our analysis. Numerical results for the extra U(1) models show that the EDME can be affected by the extra U(1) in a certain range of soft supersymmetry breaking parameters even if the extra U(1) gauge boson is heavy. The EDME may be a clue to find an extended gauge structure in the supersymmetric models.Comment: 16 pages, latex, 3 figure

Neutron electric dipole moment in a supersymmetric model with singlet quarks

The neutron electric dipole moment is investigated in a supersymmetric electroweak model admitting ${\rm SU(2)}_W$ singlet and $Q = -1/3$, say $D$-type, quarks. Significant $CP$ violating phases appear in the coupling between the singlet $D$-type quarks and the ordinary $d$-type quarks. Then, through the $d$-$D$ mixing effects on the squark mass terms the gluino one-loop diagrams provide naturally the contributions $\sim 10^{-26} e~{\rm cm}$ comparable to the current experimental bound on the neutron electric dipole moment. The $CP$ violation in the $d$-$D$ coupling would also be relevant for the electroweak baryogenesis.Comment: 16 page

CP-violating asymmetries in top-quark production and decay in e+e−e^+ e^- annihilation within the MSSM

We obtain analytic formulae for the cross section of the sequential processes of $e^+ e^- \to t \bar t$ and $t \to b l \nu$ in the laboratory frame where the dependence on triple product correlations of the type (\hat(q}_1 x \hat{q}_2 . \hat{q}_3), induced by CP violation both in the production and the decay are explicitely shown. Different observables sensitive to CP violation are defined and calculated in the Minimal Supersymmetric Standard Model (MSSM). The observables sensitive to CP violation are of the order of $10^-3$. The dependence on the masses of the supersymmetric particles is also shown.Comment: 17 pages of LateX plus five uuencoded Postscript figures, LateX file and PS-figures are also available via anonymous ftp at ftp://info.oeaw.ac.at/pub/hephy-pub/62

CP-Violating Phases in the MSSM

We combine experimental bounds on the electric dipole moments of the neutron and electron with cosmological limits on the relic density of a gaugino-type LSP neutralino to constrain certain CP-violating phases appearing in the MSSM. We find that in the Constrained MSSM, the phase |\theta_\mu | < \pi/10, while the phase \theta_A remains essentially unconstrained.Comment: Summary of a talk presented at SUSY-96, College Park, Maryland, USA (May 1996), 4 pages in LaTeX including 4 embedded postscript figures, uses epsf.sty, espcrc2.st