Neutral Current in Weak Interactions?

Nature ◽  
1973 ◽  
Vol 245 (5421) ◽  
pp. 119-119
Author(s):  
D. M.
Keyword(s):  
Weak Interactions ◽  
Neutral Current

scholarly journals Neutral-current weak interactions at an EIC

2017 ◽  
Vol 53 (3) ◽  
Author(s):  
Y. X. Zhao ◽  
A. Deshpande ◽  
J. Huang ◽  
K. S. Kumar ◽  
S. Riordan
Keyword(s):  
Weak Interactions ◽  
Neutral Current

Limits on P and T violating neutral current weak interactions

1976 ◽  
Vol 62 (1) ◽  
pp. 97-99 ◽  
Author(s):  
E.A. Hinds ◽  
C.E. Loving ◽  
P.G.H. Sandars
Keyword(s):  
Weak Interactions ◽  
Neutral Current

scholarly journals Nuclear Neutrino Spectra in Late Stellar Evolution

2018 ◽  
Vol 178 ◽  
pp. 04005
Author(s):  
G. Wendell Misch ◽  
Yang Sun ◽  
George Fuller
Keyword(s):  
Charged Lepton ◽  
Weak Interactions ◽  
Neutral Current ◽  
Neutrino Energy ◽  
Energy Spectra ◽  
Core Collapse ◽  
Model Calculations ◽  
Number Range ◽  
The Core ◽  
Carbon Burning

Neutrinos are the principle carriers of energy in massive stars, beginning from core carbon burning and continuing through core collapse and after the core bounce. In fact, it may be possible to detect neutrinos from nearby pre-supernova stars. Therefore, it is of great interest to understand the neutrino energy spectra from these stars. Leading up to core collapse, beginning around core silicon burning, nuclei become dominant producers of neutrinos, particularly at high neutrino energy, so a systematic study of nuclear neutrino spectra is desirable. We have done such a study, and we present our sd-shell model calculations of nuclear neutrino energy spectra for nuclei in the mass number range A = 21 – 35. Our study includes neutrinos produced by charged lepton capture, charged lepton emission, and neutral current nuclear deexcitation. Previous authors have tabulated the rates of charged current nuclear weak interactions in astrophysical conditions, but the present work expands on this not only by providing neutrino energy spectra, but also by including the heretofore untabulated neutral current de-excitation neutrino pairs.

scholarly journals Symmetries and Their Breaking in the Fundamental Laws of Physics

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1316
Author(s):  
Jose Bernabeu
Keyword(s):  
Gauge Symmetry ◽  
Particle Physics ◽  
Weak Interactions ◽  
Neutral Current ◽  
Laws Of Nature ◽  
New Physics ◽  
Standard Theory ◽  
Strong Interactions ◽  
Neutral Mesons ◽  
Local Gauge Symmetry

Symmetries in the Physical Laws of Nature lead to observable effects. Beyond the regularities and conserved magnitudes, the last few decades in particle physics have seen the identification of symmetries, and their well-defined breaking, as the guiding principle for the elementary constituents of matter and their interactions. Flavour SU(3) symmetry of hadrons led to the Quark Model and the antisymmetric requirement under exchange of identical fermions led to the colour degree of freedom. Colour became the generating charge for flavour-independent strong interactions of quarks and gluons in the exact colour SU(3) local gauge symmetry. Parity Violation in weak interactions led us to consider the chiral fields of fermions as the objects with definite transformation properties under the weak isospin SU(2) gauge group of the Unifying Electro-Weak SU(2) × U(1) symmetry, which predicted novel weak neutral current interactions. CP-Violation led to three families of quarks opening the field of Flavour Physics. Time-reversal violation has recently been observed with entangled neutral mesons, compatible with CPT-invariance. The cancellation of gauge anomalies, which would invalidate the gauge symmetry of the quantum field theory, led to Quark–Lepton Symmetry. Neutrinos were postulated in order to save the conservation laws of energy and angular momentum in nuclear beta decay. After the ups and downs of their mass, neutrino oscillations were discovered in 1998, opening a new era about their origin of mass, mixing, discrete symmetries and the possibility of global lepton-number violation through Majorana mass terms and Leptogenesis as the source of the matter–antimatter asymmetry in the universe. The experimental discovery of quarks and leptons and the mediators of their interactions, with physical observables in spectacular agreement with this Standard Theory, is the triumph of Symmetries. The gauge symmetry is exact only when the particles are massless. One needs a subtle breaking of the symmetry, providing the origin of mass without affecting the excellent description of the interactions. This is the Brout–Englert–Higgs Mechanism, which produces the Higgs Boson as a remnant, discovered at CERN in 2012. Open present problems are addressed with by searching the New Physics Beyond-the-Standard-Model.

Two [Ln4] molecular rings folded as compact tetrahedra

2020 ◽  
Vol 49 (21) ◽  
pp. 7182-7188
Author(s):  
Jorge Salinas-Uber ◽  
Leoní A. Barrios ◽  
Olivier Roubeau ◽  
Guillem Aromí
Keyword(s):  
Weak Interactions ◽  
Molecular Rings

A new highly photo-switchable ligand furnishes supramolecular tetrahedral nanomagnets with Ln(iii) ions (Ln = Dy, Tb). Intramolecular weak interactions define the conformation of the ligand, quenching the photochromic activity.

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