scholarly journals Neutron Electric Dipole Moment in the Standard Model: Complete Three-Loop Calculation of the Valence Quark Contributions

1997 ◽  
Vol 78 (23) ◽  
pp. 4339-4342 ◽  
Author(s):  
Andrzej Czarnecki ◽  
Bernd Krause
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Valence Quark ◽  
Neutron Electric Dipole Moment ◽  
The Standard Model

ELECTRIC DIPOLE MOMENT OF THE NEUTRON IN THE STANDARD MODEL FROM DYNAMICAL BREAKING OF CHIRAL SYMMETRY

1991 ◽  
Vol 06 (12) ◽  
pp. 1095-1101
Author(s):  
H. BANERJEE ◽  
D. CHATTERJEE ◽  
R. BANERJEE
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Chiral Symmetry ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Higgs Sector ◽  
Neutron Electric Dipole Moment ◽  
Potential Source ◽  
The Standard Model ◽  
Dynamical Breaking

Dynamical breaking of chiral symmetry in QCD is a potential source of CP violation in the flavor diagonal Higgs sector of the standard model and can lead to a neutron electric dipole moment of the size reported in recent experiments, provided the mass of the Higgs is constrained by m H ≲42 GeV .

scholarly journals CP VIOLATION IN THE DECAY η → π+ π- γ

2002 ◽  
Vol 17 (23) ◽  
pp. 1489-1497 ◽  
Author(s):  
C. Q. GENG ◽  
J. N. NG ◽  
T. H. WU
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Strange Quark ◽  
Photon Polarization ◽  
Experimental Constraint ◽  
The Standard Model ◽  
O 10

We study the CP violating effects in the decay of η → π+π- γ. We show that to have CP violation in the decay, one has to consider both linear and circular photon polarizations. In the standard model, the polarizations are vanishingly small. However, model independently, i.e. using only experimental constraint imposed by the limit on Br (η → π+ π-), it can be up to O(10%). We also explore various possible operators and we find that the tensor type operator, possibly arising from a nonzero CP violating electric dipole moment of the strange quark, can induce a sizable linear photon polarization.

scholarly journals CP VIOLATION IN SUPERSYMMETRIC THEORIES

2003 ◽  
Vol 18 (10) ◽  
pp. 1697-1732 ◽  
Author(s):  
SHAABAN KHALIL
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Standard Model ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Neutron Electric Dipole Moment ◽  
Cp Asymmetry ◽  
Electric Dipole Moments ◽  
The Standard Model ◽  
Supersymmetric Theories

We review the present status of the CP violating problem in supersymmetric extensions of the standard model. We analyze the constraints imposed by the experimental limits of the electron, neutron, and mercury electric dipole moments on the supersymmetric CP phases and show that only the scenarios with flavour-off-diagonal CP violation remain attractive. These scenarios require Hermitian Yukawa matrices which naturally arise in models with left–right symmetry or a SU(3) flavour symmetry. In this case, εK and ε′/ε can be saturated by a small non-universality of the soft scalar masses through the gluino and chargino contributions respectively. The model also predicts a strong correlation between A CP (b → sγ) and the neutron electric dipole moment. In this framework, the standard model gives a the leading contribution to the CP asymmetry in B → ψKS decay, while the dominant chargino contribution to this asymmetry is < 0.2. Thus, no constraint is set on the non-universality of this model by the recent BaBar and Belle measurements.

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