scholarly journals Electromagnetic Properties of Neutrinos

2012 ◽  
Vol 2012 ◽  
pp. 1-47 ◽  
Author(s):  
C. Broggini ◽  
C. Giunti ◽  
A. Studenikin
Keyword(s):  
Radiative Decay ◽  
Dipole Moments ◽  
Form Factors ◽  
Transverse Magnetic ◽  
Electromagnetic Properties ◽  
Electromagnetic Form Factors ◽  
General Description ◽  
Electric Dipole Moments ◽  
Theoretical Predictions ◽  
Majorana Neutrinos

In this paper, we discuss the main theoretical aspects and experimental effects of neutrino electromagnetic properties. We start with a general description of the electromagnetic form factors of Dirac and Majorana neutrinos. Then, we discuss the theory and phenomenology of the magnetic and electric dipole moments, summarizing the experimental results and the theoretical predictions. We discuss also the phenomenology of a neutrino charge radius and radiative decay. Finally, we describe the theory of neutrino spin and spin-flavor precession in a transverse magnetic field and we summarize its phenomenological applications.

scholarly journals Electric dipole moments of leptons in the presence of Majorana neutrinos

2004 ◽  
Vol 70 (7) ◽  
Author(s):  
John Paul Archambault ◽  
Andrzej Czarnecki ◽  
Maxim Pospelov
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Electric Dipole Moments ◽  
Majorana Neutrinos

scholarly journals Vanishing or non-vanishing rainbow? Reduction formulas of electric dipole moment

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Motoko Fujiwara ◽  
Junji Hisano ◽  
Takashi Toma
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Form Factors ◽  
The Other ◽  
Vertex Correction ◽  
Electric Dipole Moments ◽  
Self Energy ◽  
The Standard Model ◽  
General Setup ◽  
Exact Cancellation

Abstract In this paper, we derive a simplified formula of electric dipole moments (EDMs) of a fermion. In the Standard Model, it is well-known that non-trivial cancellations between some rainbow-type diagrams induced by W boson exchanges occur in the calculation of the neutron EDM at the two-loop level due to the gauge symmetry. The fermion self-energy and the vertex correction are related through the Ward-Takahashi identity, and this relation causes the exact cancellation of the EDM. We derive EDM formulas for a more general setup by introducing the form factors for the fermion self-energy and the vertex correction so that the derived formulas can be applicable to a larger class of models. We conclude that the non-zero EDM contributions are induced from rainbow-type diagrams with the chirality flipping effects for internal fermions. We also discuss the other possible generalization of the EDM calculation which is applicable to the other classes of models.

DYNAMICS IN PERTURBED VERY DILUTE AQUEOUS SOLUTIONS: THEORY AND EXPERIMENTAL EVIDENCE

2013 ◽  
Vol 27 (05) ◽  
pp. 1350005 ◽  
Author(s):  
TAMAR A. YINNON ◽  
VITTORIO ELIA
Keyword(s):  
Aqueous Solutions ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Self Organization ◽  
Water Molecules ◽  
Quantum Field ◽  
Electric Dipole Moments ◽  
Periodic Oscillations ◽  
Theoretical Predictions ◽  
Dilute Aqueous Solutions

Perturbed very dilute aqueous solutions are investigated by analyzing their electric conductivity (χ). Foci include titrations and quasi-periodic oscillations of χ spanning several months. The χ data reflect persistent dissipative supramolecular self-organization. This paper's successful consistent explanations of the χ measurements corroborate earlier quantum field theoretical predictions. For example: (1) Permanent polarization results from quantum electro-dynamical interactions mediated auto-ordering of water molecules and molecular aggregates which have electric dipole moments. (2) The aggregates are created by exciting very dilute aqueous solutions, generating long lasting (cold) vortices in crystalline-like-structured super-fluidic domains. These domains are only present when the concentration (C) is lower than a solute dependent transitions concentration (C trans ). Typically, C trans is of the order of 10-4 M or below.

scholarly journals Searches for Electric Dipole Moments—Overview of Status and New Experimental Efforts

Universe ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 56
Author(s):  
Florian Kuchler on behalf of the TUCAN and HeXeEDM Collaborations
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Global Analysis ◽  
Model Parameters ◽  
Electric Dipole Moments ◽  
Spallation Target ◽  
Fundamental Particles ◽  
T Violation ◽  
Theoretical Predictions ◽  
The Universe

Searches for permanent electric dipole moments (EDMs) of fundamental particles, atoms and molecules are promising experiments to constrain and potentially reveal beyond Standard Model (SM) physics. A non-zero EDM is a direct manifestation of time-reversal (T) violation, and, equivalently, violation of the combined operation of charge-conjugation (C) and parity inversion (P). Identifying new sources of CP violation can help to solve fundamental puzzles of the SM, e.g., the observed baryon-asymmetry in the Universe. Theoretical predictions for magnitudes of EDMs in the SM are many orders of magnitude below current experimental limits. However, many theories beyond the SM require larger EDMs. Experimental results, especially when combined in a global analysis, impose strong constraints on CP violating model parameters. Including an overview of EDM searches, I will focus on the future neutron EDM experiment at TRIUMF (Vancouver). For this effort, the TUCAN (TRIUMF Ultra Cold Advanced Neutron source) collaboration is aiming to build a strong, world leading source of ultra cold neutrons (UCN) based on a unique combination of a spallation target and a superfluid helium UCN converter. Another focus will be the search for an EDM of the diamagnetic atom 129 Xe using a 3 He comagnetometer and SQUID detection. The HeXeEDM collaboration has taken EDM data in 2017 and 2018 in the magnetically shielded room (BMSR-2) at PTB Berlin.

scholarly journals Filling the gaps between model predictions and their prerequisites in electric dipole moments

2016 ◽  
Vol 31 (14n15) ◽  
pp. 1650082 ◽  
Author(s):  
Takeshi Fukuyama ◽  
Koichiro Asahi
Keyword(s):  
Electric Dipole ◽  
Model Building ◽  
Dipole Moments ◽  
The Other ◽  
Beyond The Standard Model ◽  
Correct Interpretation ◽  
Electric Dipole Moments ◽  
The Standard Model ◽  
Model Predictions ◽  
Theoretical Predictions

We clarify the conditions or assumptions under which theoretical predictions of various models beyond the standard model give mainly in electric dipole moments. The correct interpretation of those conditions seems to be indispensable to the refinements of model building as well as to the mutual reliance in experimental and theoretical communities. The connections of these analyses to the recent experimental results at the LHC and the other places are also discussed.

scholarly journals Lattice calculation of electric dipole moments and form factors of the nucleon

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
M. Abramczyk ◽  
S. Aoki ◽  
T. Blum ◽  
T. Izubuchi ◽  
H. Ohki ◽  
...  
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Form Factors ◽  
Lattice Calculation ◽  
Electric Dipole Moments

Recent experiments with the C. E. R. N. synchro-cyclotron

1964 ◽  
Vol 278 (1374) ◽  
pp. 323-331
Keyword(s):  
Magnetic Field ◽  
Electric Dipole ◽  
Small Volume ◽  
Dipole Moments ◽  
Decay Process ◽  
Electromagnetic Properties ◽  
Solid Target ◽  
Electric Dipole Moments ◽  
New Information ◽  
Long Time

The C.E.R.N. synchro-cyclotron is capable of accelerating protons up to an energy of 600 MeV, and when they strike a solid target they produce intense beams of π ± -mesons. The particles produced are relatively slow, and an absorber a few centimetres thick is sufficient to bring them to rest. A large number of mesons can therefore be confined to a small volume for a relatively long time, until they decay or interact with the surrounding matter. μ ± -mesons may also be produced by allowing the π ± -mesons to decay in flight. A very important feature of the μ -meson beams so produced is that they are almost 100% longitudinally polarized; i. e. their spins are alined about the direction of motion and in a given sense. Accurate determinations can thus be made of the way features of the decay process, and of interactions with matter, depend on the spin direction. Further, by making the μ -mesons precess in a strong magnetic field, one can determine quantities like their magnetic and electric dipole moments with high precision. I shall describe experiments recently performed with the C. E. R. N. synchro-cyclotron which give new information about the weak and electromagnetic properties of the π - and μ - mesons.

scholarly journals Studies on the anomalous magnetic and electric dipole moments of the tau-neutrino in pp collisions at the LHC

2019 ◽  
Vol 55 (8) ◽  
Author(s):  
A. Gutiérrez-Rodríguez ◽  
M. Köksal ◽  
A. A. Billur ◽  
M. A. Hernández-Ruíz
Keyword(s):  
Electric Dipole ◽  
Dipole Moments ◽  
Pp Collisions ◽  
Electric Dipole Moments ◽  
Tau Neutrino
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