scholarly journals A NOTE ON MAJORANA NEUTRINOS, LEPTONIC CKM AND ELECTRON ELECTRIC DIPOLE MOMENT

1996 ◽  
Vol 11 (03) ◽  
pp. 211-216 ◽  
Author(s):  
DANIEL NG ◽  
JOHN N. NG
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Majorana Neutrino ◽  
Loop Order ◽  
The Standard Model ◽  
Majorana Neutrinos ◽  
Electron Electric Dipole Moment

The electric dipole moment of the electron, de, is known to vanish up to three-loop in the standard model with massless neutrinos. However, if neutrinos are massive Majorana particles, we obtain the result that de induced by leptonic CKM mechanism is nonvanishing at two-loop order, and it applies to all massive Majorana neutrino models.

scholarly journals ELECTRON ELECTRIC DIPOLE MOMENT EXPERIMENT WITH SLOW ATOMS

2007 ◽  
Vol 16 (12b) ◽  
pp. 2337-2342 ◽  
Author(s):  
HARVEY GOULD
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Standard Model ◽  
Neutrino Mass ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Atomic Clock ◽  
New Physics ◽  
The Standard Model ◽  
Electron Electric Dipole Moment

Discovering an electron electric dipole moment (e-EDM) would uncover new physics requiring an extension of the Standard Model. e-EDMs, large enough to be discovered by new experiments are now common predictions in extensions of the Standard Model, including extensions that describe baryogenesis, dark matter, and neutrino mass. A cesium slow-atom e-EDM experiment (which is similar to an atomic clock) can improve the sensitivity to the e-EDM. And, as with an atomic clock, it could be more sensitive in microgravity than on Earth. As a first step an Earth-based demonstration Cs fountain e-EDM experiment has been carried out at LBNL.

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.

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