scholarly journals CONSTRAINING SUSY MODELS WITH SPONTANEOUS CP VIOLATION VIA B→ψKs

2000 ◽  
Vol 15 (19) ◽  
pp. 2987-2999
Author(s):  
OLEG LEBEDEV
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Arbitrary Number ◽  
Neutron Electric Dipole Moment ◽  
Cp Asymmetry ◽  
The Standard Model ◽  
Supersymmetric Models ◽  
Susy Models

We study CP-violating effects in B→ψKs decay within minimal supersymmetric models with spontaneous CP violation. We find that the CP asymmetry predicted by the Standard Model in this decay, sin 2β≥0.4, cannot be accommodated in these models without violating the bound on the neutron electric dipole moment. This result holds for NMSSM-like models with an arbitrary number of sterile superfields. Further implications of the scenario are discussed.

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.

scholarly journals Neutron Electric Dipole Moment on the Lattice

2018 ◽  
Vol 175 ◽  
pp. 01014 ◽  
Author(s):  
Boram Yoon ◽  
Tanmoy Bhattacharya ◽  
Rajan Gupta
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Lattice Qcd ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Beyond The Standard Model ◽  
Matrix Elements ◽  
The Standard Model ◽  
The Status ◽  
Good Probe

For the neutron to have an electric dipole moment (EDM), the theory of nature must have T, or equivalently CP, violation. Neutron EDM is a very good probe of novel CP violation in beyond the standard model physics. To leverage the connection between measured neutron EDM and novel mechanism of CP violation, one requires the calculation of matrix elements for CP violating operators, for which lattice QCD provides a first principle method. In this paper, we review the status of recent lattice QCD calculations of the contributions of the QCD Θ-term, the quark EDM term, and the quark chromo-EDM term to the neutron EDM.

scholarly journals SUFFICIENTLY SMALL $\bar\theta$inSU(3)3 × S3 UNIFICATION MODEL

2002 ◽  
Vol 17 (23) ◽  
pp. 1513-1524 ◽  
Author(s):  
K. CHALUT ◽  
H. CHENG ◽  
P. H. FRAMPTON ◽  
K. STOWE ◽  
T. YOSHIKAWA
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole ◽  
High Energy ◽  
Neutron Electric Dipole Moment ◽  
Standard Model Extension ◽  
Weak Decays ◽  
Up Quark ◽  
Model Extension ◽  
The Standard Model

Since CP violation in weak decays is successfully described by the KM mechanism, the strong CP problem cannot be easily accommodated. This leads us to reconsider the issue. If the axion and massless up quark are abandoned, we must extend the standard model. Extension to SU (3)3 × S3 unification leads to the following situation: if CP is a high-energy symmetry and the appropriate symmetry-breaking hierarchy of scales is in place, then the [Formula: see text] parameter of the QCD sub-theory is guaranteed to be sufficiently small. We find [Formula: see text] while the empirical limit from the neutron electric dipole moment requires only that [Formula: see text].

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.

CP VIOLATION IN η → μ+μ−

1990 ◽  
Vol 05 (27) ◽  
pp. 2271-2280 ◽  
Author(s):  
XIAO-GANG HE ◽  
BRUCE H. J. McKELLAR ◽  
PAUL K. PALLAGHY
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Gauge Group ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Upper Bound ◽  
Neutron Electric Dipole Moment

We investigate a CP violating observable, the μ-polarization, in η → μ+μ− in several models with the standard gauge group. The CP violating parameters are constrained by the experimental upper bound on the neutron electric dipole moment. Among the models considered here, it was found that those with leptoquark scalars dominate the contributions to μ-polarization in η → μ+μ−. μ-polarization can be of order 10−3.

CP violation induced by penguin diagrams and the neutron electric dipole moment

1982 ◽  
Vol 109 (3) ◽  
pp. 215-220 ◽  
Author(s):  
M.B. Gavela ◽  
A. Le Yaouanc ◽  
L. Oliver ◽  
O. Pène ◽  
J.-C. RaynaL ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Neutron Electric Dipole Moment
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