scholarly journals Probing neutrino dipole portal at COHERENT experiment

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Arnab Dasgupta ◽  
Sin Kyu Kang ◽  
Jihn E. Kim
Keyword(s):  
Statistical Analysis ◽  
Standard Model ◽  
Neutrino Mass ◽  
Magnetic Moment ◽  
Sterile Neutrino ◽  
Liquid Argon ◽  
Sterile Neutrinos ◽  
Transition Magnetic Moment ◽  
The Standard Model ◽  
Nucleus Scattering

Abstract Motivated by the first observation of coherent-elastic neutrino-nucleus scattering at the COHERENT experiment, we confront the neutrino dipole portal giving rise to the transition of the standard model neutrinos to sterile neutrinos with the recently released CENNS 10 data from the liquid argon as well as the CsI data of the COHERENT experiment. Performing a statistical analysis of those data, we show how the transition magnetic moment can be constrained for the range of the sterile neutrino mass between 10 keV and 40 MeV.

scholarly journals Constraining new physics from the first observation of coherent elastic neutrino-nucleus scattering

2019 ◽  
Vol 26 ◽  
pp. 17
Author(s):  
D. K. Papoulias ◽  
T. S. Kosmas
Keyword(s):  
Neutrino Physics ◽  
Magnetic Moment ◽  
Charge Radius ◽  
Sterile Neutrino ◽  
Neutral Current ◽  
New Physics ◽  
Electromagnetic Properties ◽  
Spallation Neutron Source ◽  
The Standard Model ◽  
Nucleus Scattering

The process of neutral-current coherent elastic neutrino-nucleus scattering, consistent with the Standard Model (SM) expectation, has been recently measured by the COHERENT experiment at the Spallation Neutron Source. On the basis of the observed signal and our nuclear calculations for the relevant Cs and I isotopes, the extracted constraints on both conventional and exotic neutrino physics are updated. The present study concentrates on various SM extensions involving vector and tensor nonstandard interactions as well as neutrino electromagnetic properties, with an emphasis on the neutrino magnetic moment and the neutrino charge radius. Furthermore, models addressing a light sterile neutrino state are examined, and the corresponding regions excluded by the COHERENT experiment are presented.   

Testing sterile neutrino extensions of the Standard Model at the Circular Electron Positron Collider

2015 ◽  
Vol 30 (23) ◽  
pp. 1544004 ◽  
Author(s):  
Stefan Antusch ◽  
Oliver Fischer
Keyword(s):  
Standard Model ◽  
Sterile Neutrino ◽  
Expected Improvement ◽  
Neutrino Masses ◽  
Electroweak Scale ◽  
Sterile Neutrinos ◽  
Precision Data ◽  
Electron Positron ◽  
The Standard Model ◽  
The Masses

Extending the Standard Model with sterile (“right-handed”) neutrinos is one of the best motivated ways to account for the observed neutrino masses. We discuss the expected sensitivity of the Circular Electron Positron Collider (CEPC) for testing such extensions. An interesting scenario is given by symmetry protected seesaw models, which theoretically allow for sterile neutrino masses around the electroweak scale with up to order one mixings with the active (SM) neutrinos. When the masses of the sterile neutrinos are well above the electroweak scale, they affect precision data via effective non-unitarity of the leptonic mixing matrix in a model independent way. The expected improvement of the electroweak precision observables from the CEPC may allow to test mixings between active and sterile neutrinos down to [Formula: see text] (using currently discussed CEPC performance parameters). For sterile neutrinos with masses around the electroweak scale, direct searches are possible. Such tests are given by the search for sterile neutrino decays at the [Formula: see text] pole, by deviations from the SM cross section for four leptons at and beyond the [Formula: see text] threshold, and by Higgs boson production and decays. The expected sensitivities at the CEPC could reach down to mixings as small as [Formula: see text].

scholarly journals Coherent Elastic Neutrino-Nucleus Scattering as a Precision Test for the Standard Model and Beyond: The COHERENT Proposal Case

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
O. G. Miranda ◽  
G. Sanchez Garcia ◽  
O. Sanders
Keyword(s):  
Standard Model ◽  
Sterile Neutrino ◽  
New Physics ◽  
Recent Measurement ◽  
Future Perspectives ◽  
Weak Mixing Angle ◽  
Mixing Angle ◽  
The Standard Model ◽  
Nucleus Scattering ◽  
Precision Test

Several experimental proposals expect to confirm the recent measurement of the coherent elastic neutrino-nucleus scattering (CEvNS). Motivated in particular by the next generation experiments of the COHERENT collaboration, we study their sensitivity to different tests of the Standard Model and beyond. We analyze the resolution that can be achieved by each future proposed detector in the measurement of the weak mixing angle; we also perform a similar analysis in the context of Nonstandard Interaction (NSI) and in the case of oscillations into a sterile neutrino state. We show that future perspectives are interesting for these types of new physics searches.

Implications of Higgs’ universality for physics beyond the Standard Model

2017 ◽  
Vol 32 (16) ◽  
pp. 1742003
Author(s):  
T. Goldman ◽  
G. J. Stephenson
Keyword(s):  
Standard Model ◽  
Sterile Neutrino ◽  
Current Data ◽  
Fermion Mass ◽  
Beyond The Standard Model ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Seesaw Mechanism ◽  
The Standard Model ◽  
Mass Terms

We emulate Cabibbo by assuming a kind of universality for fermion mass terms in the Standard Model. We show that this is consistent with all current data and with the concept that deviations from what we term Higgs’ universality are due to corrections from currently unknown physics of nonetheless conventional form. The application to quarks is straightforward, while the application to leptons makes use of the recognition that Dark Matter can provide the “sterile” neutrinos needed for the seesaw mechanism. Requiring agreement with neutrino oscillation results leads to the prediction that the mass eigenstates of the sterile neutrinos are separated by quadratically larger ratios than for the charged fermions. Using consistency with the global fit to LSND-like, short-baseline oscillations to determine the scale of the lowest mass sterile neutrino strongly suggests that the recently observed astrophysical 3.55 keV [Formula: see text]-ray line is also consistent with the mass expected for the second most massive sterile neutrino in our analysis.

scholarly journals Sterile Neutrinos as Dark Matter: Alternative Production Mechanisms in the Early Universe

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 264
Author(s):  
Daniel Boyanovsky
Keyword(s):  
Dark Matter ◽  
Distribution Function ◽  
Kinetic Equation ◽  
Standard Model ◽  
Early Universe ◽  
Quantum Kinetic Equation ◽  
Sterile Neutrinos ◽  
The Standard Model ◽  
Production Mechanisms ◽  
Freeze Out

We study various production mechanisms of sterile neutrinos in the early universe beyond and within the standard model. We obtain the quantum kinetic equations for production and the distribution function of sterile-like neutrinos at freeze-out, from which we obtain free streaming lengths, equations of state and coarse grained phase space densities. In a simple extension beyond the standard model, in which neutrinos are Yukawa coupled to a Higgs-like scalar, we derive and solve the quantum kinetic equation for sterile production and analyze the freeze-out conditions and clustering properties of this dark matter constituent. We argue that in the mass basis, standard model processes that produce active neutrinos also yield sterile-like neutrinos, leading to various possible production channels. Hence, the final distribution function of sterile-like neutrinos is a result of the various kinematically allowed production processes in the early universe. As an explicit example, we consider production of light sterile neutrinos from pion decay after the QCD phase transition, obtaining the quantum kinetic equation and the distribution function at freeze-out. A sterile-like neutrino with a mass in the keV range produced by this process is a suitable warm dark matter candidate with a free-streaming length of the order of few kpc consistent with cores in dwarf galaxies.

Photoproduction of W bosons as a test of the standard model

1991 ◽  
Vol 69 (1) ◽  
pp. 52-56
Author(s):  
Mark A. Samuel ◽  
C. Kalman ◽  
M. Frank ◽  
C. Hamzaoui ◽  
Guowen Li
Keyword(s):  
Standard Model ◽  
Magnetic Moment ◽  
W Bosons ◽  
Sensitive Measure ◽  
The Standard Model ◽  
Radiation Amplitude ◽  
Colliding Beams

The photoproduction of W bosons is proposed as a means of testing the standard model. In particular, the radiation amplitude zero, which may occur in this process, provides a sensitive measure of the magnetic moment of the W bosons. Such experiments, using colliding beams, are feasible with present-day accelerators.

scholarly journals HIDING THE EXISTENCE OF A FAMILY SYMMETRY IN THE STANDARD MODEL

2005 ◽  
Vol 20 (36) ◽  
pp. 2767-2774 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Neutrino Mass Matrix ◽  
Tree Level ◽  
Family Symmetry ◽  
The Standard Model

If a family symmetry exists for the quarks and leptons, the Higgs sector is expected to be enlarged to be able to support the transformation properties of this symmetry. There are, however, three possible generic ways (at tree level) of hiding this symmetry in the context of the Standard Model with just one Higgs doublet. All three mechanisms have their natural realizations in the unification symmetry E6 and one in SO (10). An interesting example based on SO (10)×A4 for the neutrino mass matrix is discussed.

scholarly journals Enhanced Derivation of the Electron Magnetic Moment Anomaly from the Electron Charge using Geometric Principles

2018 ◽  
Vol 10 (6) ◽  
pp. 24 ◽  
Author(s):  
Andrew Worsley ◽  
J.F. Peters
Keyword(s):  
Fine Structure ◽  
Standard Model ◽  
Magnetic Moment ◽  
Geometric Model ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Electron Charge ◽  
Mathematical Equation ◽  
The Standard Model ◽  
Electron Magnetic Moment

The electron magnetic moment anomaly is conventionally derived from the fine structure constant using a complex formula requiring over 13,000 evaluations. However, the charge of the electron is an important parameter of the Standard Model and could provide an enhanced basis for the derivation of the electron magnetic moment anomaly. This paper uses a geometric model to reformulate the equation for the electron’s charge, this is then used to determine a more accurate value for the electron magnetic moment anomaly from first geometric principles. This enhanced derivation uses a single evaluation, using a concise mathematical equation based on the natural log e^pi. This geometric model will lead to further work to theoretically improve the understanding of the electron.

CP VIOLATION IN THE B SYSTEM—A STATISTICAL ANALYSIS

1990 ◽  
Vol 05 (05) ◽  
pp. 337-347
Author(s):  
DAVID LONDON
Keyword(s):  
Statistical Analysis ◽  
Cp Violation ◽  
Standard Model ◽  
Probability Distributions ◽  
New Physics ◽  
Hadronic Decay ◽  
System A ◽  
The Standard Model ◽  
Model Predictions ◽  
Cp Asymmetries

The standard model predictions for CP violating hadronic decay asymmetries are presented in the form of probability distributions. From these distributions, it can be easily seen what the most likely values of these quantities are, which measurements would clearly be signs of new physics, and which values of the CP asymmetries would most constrain the parameters of the standard model.

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