scholarly journals Reexamination of the standard model nucleon electric dipole moment

2015 ◽  
Vol 91 (2) ◽  
Author(s):  
Chien-Yeah Seng
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
The Standard Model

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 SEARCHING FOR NEW PHYSICS BEYOND THE STANDARD MODEL IN ELECTRIC DIPOLE MOMENT

2012 ◽  
Vol 27 (16) ◽  
pp. 1230015 ◽  
Author(s):  
TAKESHI FUKUYAMA
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Atoms And Molecules ◽  
Wide Range ◽  
The Standard Model ◽  
Atomic And Molecular Physics

This is a theoretical review of exploration of new physics beyond the Standard Model (SM) in the electric dipole moment (EDM) in elementary particles, atoms and molecule. EDM is a very important CP violating phenomenon and sensitive to new physics. Starting with the estimations of EDM of quarks–leptons in SM, we explore new signals beyond SM. However, these works drive us to wider frontiers where we search fundamental physics using atoms and molecules and vice versa. Paramagnetic atoms and molecules have great enhancement factor on electron EDM. Diamagnetic atoms and molecules are very sensitive to nuclear P and T odd processes. Thus EDM becomes the keyword not only of New Physics but also of unprecedented fruitful collaborations among particle, atomic and molecular physics. This review intends to help such collaborations over a wide range of physicists.

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 CHARGED LEPTON ELECTRIC DIPOLE MOMENT ENHANCEMENT IN THE LORENTZ VIOLATED EXTENSION OF THE STANDARD MODEL

2013 ◽  
Vol 28 (24) ◽  
pp. 1350115 ◽  
Author(s):  
M. HAGHIGHAT ◽  
I. MOTIE ◽  
Z. REZAEI
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Momentum Transfer ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Charged Lepton ◽  
Form Factors ◽  
High Energy ◽  
Dipole Form Factor ◽  
The Standard Model

We consider the Lorentz violated extension of the standard model. In this framework, there are terms that explicitly violate CP-symmetry. We examine the CPT-even dμν-term to find the electric dipole moment of charged leptons. We show that the form factors besides the momentum transfer, depend on a new Lorentz-scalar, constructing by dμν and the four momenta of the lepton, as well. Such an energy dependence of the electric dipole form factor leads to an enhancement of the lepton electric dipole moment at high energy, even at the zero momentum transfer. We show that at [Formula: see text] the electric dipole moment of the charged lepton can be as large as 10-14 e cm .

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