CP violation with an intermediate weak vector boson

1969 ◽  
Vol 47 (6) ◽  
pp. 693-695 ◽  
Author(s):  
Radha Gourishankar ◽  
A. N. Kamal
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Vector Boson ◽  
Semileptonic Decays ◽  
Nonleptonic Decays ◽  
Weak Vector

A model of CP violation due to the existence of a neutral intermediate weak vector boson is studied. It is found that all leptonic and semileptonic decays are CP conserving; however nonleptonic decays are all CP violating to order [Formula: see text]. The CP-violating decays also preserve the [Formula: see text]. An estimate of the electric dipole moment of the nucleon based on such a model gives μe ≈ 10−29 e cm. The electric dipole moment of the electron is zero.

scholarly journals THE HIGGS SECTOR AND ELECTRON ELECTRIC DIPOLE MOMENT IN NEXT-TO-MINIMAL SUPERSYMMETRY WITH EXPLICIT CP VIOLATION

2006 ◽  
Vol 21 (03) ◽  
pp. 243-264 ◽  
Author(s):  
MÜGE BOZ
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Higgs Field ◽  
Higgs Sector ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Supersymmetric Model ◽  
Numerical Predictions

We study the explicit CP violation of the Higgs sector in the next-to-minimal supersymmetric model with a gauge singlet Higgs field. Our numerical predictions show that electric dipole moment of electron lies around the present experimental upper limits. The mass of the lightest Higgs boson is quite sensitive to the CP violating phases in the theory. It is observed that as the vacuum expectation value of the singlet gets higher values, CP violation increases.

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.

Probing new CP-odd thresholds with electric dipole moments

2007 ◽  
Vol 85 (6) ◽  
pp. 597-606
Author(s):  
A Ritz
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Dipole Moments ◽  
New Physics ◽  
Electric Dipole Moments ◽  
Higher Dimensional ◽  
The Status ◽  
Generic Class

We dicuss the utility of precision probes for flavour-diagonal CP-violation, namely, searches for electric dipole moments of nucleons, atoms, and molecules, in looking for new physics thresholds that manifest themselves primarily through higher dimensional operators. After reviewing the status of the electric dipole moment (EDM) constraints, we consider first the sensitivity to a generic class of dimension-five operators generated at a supersymmetric threshold, through their contribution to CP- and flavour-violating observables. Such thresholds can be probed by EDMs up to a scale of order 108 GeV depending on the flavour structure. We then turn to consider the possibility that electroweak baryogenesis is made feasible by the introduction of dimension-six operators at a TeV-scale threshold. The EDM costraints on dimension-six couplings of the Higgs to the fermions currently still allow a reasonable window in parameter space for these models, but the next generation of experiments should provide a conclusive test. PACS Nos.: 11.30.Er, 12.60.Fr, 12.60.Jv

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.

QCD corrections to the quark electric dipole moment in the SU(2)L × SU(2)R × U(1) model of CP violation

1990 ◽  
Vol 251 (3) ◽  
pp. 443-449 ◽  
Author(s):  
J.-M. Frère ◽  
J. Galand ◽  
A. Le Yaouanc ◽  
L. Oliver ◽  
O. Pène ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Electric Dipole Moment ◽  
Electric Dipole

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.

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