Electric dipole moment of atoms due to parity and time-reversal violation and its implications for physics beyond the Standard Model

Pramana ◽  
1993 ◽  
Vol 41 (S1) ◽  
pp. 413-416 ◽  
Author(s):  
B P Das
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Time Reversal ◽  
Beyond The Standard Model ◽  
The Standard Model

scholarly journals Neutron Electric Dipole Moment from Beyond the Standard Model

2019 ◽  
Author(s):  
Tanmoy Bhattacharya ◽  
Boram Yoon ◽  
Rajan Gupta ◽  
Vincenzo Cirigliano
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Beyond The Standard Model ◽  
Neutron Electric Dipole Moment ◽  
The Standard Model

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.

scholarly journals Rare CP-violated η and η′ meson decays and neutron EDM.

2018 ◽  
Vol 191 ◽  
pp. 02003
Author(s):  
Alexey S. Zhevlakov ◽  
Mikhail Gorchtein ◽  
Astrid N. Hiller Blin ◽  
Valery E. Lyubovitskij
Keyword(s):  
Dipole Moment ◽  
Standard Model ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Beyond The Standard Model ◽  
Meson Decays ◽  
Upper Limit ◽  
Upper Limits ◽  
The Standard Model

The data for the upper limit on the electric dipole moment of the neutron (nEDM) can be explained by using different mechanisms beyond the Standard Model (SM). The nEDM can be generated by a CP-violating transition of η and η′ mesons into pion pairs. We derive the upper limits for the rates of the CP-violating decays η(η′) → 2π are by orders of magnitude more stringent than those from existing experiments so far.

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 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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