scholarly journals STERILE NEUTRINO PRODUCTION THROUGH A MATTER EFFECT ENHANCEMENT AT LONG BASELINES

2013 ◽  
Vol 28 (16) ◽  
pp. 1350067 ◽  
Author(s):  
JOSEPH BRAMANTE
Keyword(s):  
Standard Model ◽  
Sterile Neutrino ◽  
Neutral Current ◽  
Sterile Neutrinos ◽  
Vector Coupling ◽  
Neutrino Production ◽  
Long Baseline ◽  
Current Events ◽  
Matter Effect ◽  
Long Baselines

If sterile neutrinos have a neutral coupling to standard model fermions, matter effect resonant transitions to sterile neutrinos and excess neutral-current events could manifest at long baseline experiments. Assuming a single sterile neutrino with a neutral coupling to fermionic matter, we re-examine bounds on sterile neutrino production at long baselines from the MINOS result Pνμ →νs < 0.22 (90% CL). We demonstrate that sterile neutrinos with a neutral vector coupling to fermionic matter could evade the MINOS limit, allowing a higher fraction of active to sterile neutrino conversion at long baselines. Scanning the parameter space of sterile neutrino matter effect fits of the LSND and MiniBooNe data, we show that in the case of a vector singlet coupling of sterile neutrinos to matter, some favored parametrizations of these fits would create neutral-current event excesses above standard model predictions at long baseline experiments (e.g. MINOS and OPERA).

scholarly journals NEUTRINO SHORTCUTS IN SPACETIME

2012 ◽  
Vol 27 (21) ◽  
pp. 1250127 ◽  
Author(s):  
A. NICOLAIDIS
Keyword(s):  
Extra Dimensions ◽  
Sterile Neutrino ◽  
Large Extra Dimensions ◽  
Resonance Phenomenon ◽  
Neutrino Beam ◽  
Strong Mixing ◽  
Sterile Neutrinos ◽  
Large Extra Dimension ◽  
Long Baseline ◽  
Experimental Side

Theories with large extra dimensions may be tested using sterile neutrinos living in the bulk. A bulk neutrino can mix with a flavor neutrino localized in the brane leading to unconventional patterns of neutrino oscillations. A resonance phenomenon, strong mixing between the flavor and the sterile neutrino, allows one to determine the radius of the large extra dimension. If our brane is curved, then the sterile neutrino can take a shortcut through the bulk, leading to an apparent superluminal neutrino speed. The amount of "superluminality" is directly connected to parameters determining the shape of the brane. On the experimental side, we suggest that a long baseline neutrino beam from CERN to NESTOR neutrino telescope will help to clarify these important issues.

scholarly journals Neutrino oscillations in the presence of super-light sterile neutrinos

2016 ◽  
Vol 31 (20n21) ◽  
pp. 1650123 ◽  
Author(s):  
Paraskevi Divari ◽  
John Vergados
Keyword(s):  
Sterile Neutrino ◽  
Neutral Current ◽  
Neutron Number ◽  
Electron Neutrino ◽  
Number Density ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
The Earth ◽  
Reactor Neutrino ◽  
Neutrino Experiments

In this paper, we study the effect of conversion of super-light sterile neutrino (SLSN) to electron neutrino in matter like that of the Earth. In the Sun the resonance conversion between SLSN and electron neutrino via the neutral current is suppressed due to the smallness of neutron number. On the other hand, neutron number density can play an important role in the Earth, making the scenario of SLSN quite interesting. The effect of CP-violating phases on active-SLSN oscillations is also discussed. Reactor neutrino experiments with medium or short baseline may probe the scenario of SLSN.

scholarly journals IMPLICATIONS OF QUARK–LEPTON SYMMETRY FOR NEUTRINO MASSES AND OSCILLATIONS

2000 ◽  
Vol 15 (06) ◽  
pp. 439-443 ◽  
Author(s):  
T. GOLDMAN ◽  
G. J. STEPHENSON ◽  
B. H. J. McKELLAR
Keyword(s):  
Model Prediction ◽  
Neutral Current ◽  
Charged Current ◽  
Solar Model ◽  
Neutrino Masses ◽  
Current Signal ◽  
Standard Solar Model ◽  
Sterile Neutrinos ◽  
Long Baseline ◽  
Flavor Mixing

We identify a plausible scenario based on quark–lepton symmetry which correlates long baseline oscillations with maximal mixing to sterile neutrinos. The implication for the Sudbury Neutrino Observatory (SNO) is that the neutral current signal will be found to suffer the same suppression from the standard solar model prediction as obtains for the charged current signal. Flavor mixing among active neutrinos is expected to occur on shorter baselines with smaller mixing amplitudes.

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 A model-independent analysis of $$b{\rightarrow }s\mu ^{+}\mu ^{-}$$transitions with GAMBIT ’s FlavBit

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
Jihyun Bhom ◽  
Marcin Chrzaszcz ◽  
Farvah Mahmoudi ◽  
Markus T. Prim ◽  
Pat Scott ◽  
...  
Keyword(s):  
Standard Model ◽  
Neutral Current ◽  
Current Data ◽  
Operator Product ◽  
Beyond The Standard Model ◽  
Vector Coupling ◽  
Independent Analysis ◽  
The Standard Model ◽  
Model Independent ◽  
Best Fit

AbstractThe search for flavour-changing neutral current effects in B-meson decays is a powerful probe of physics beyond the Standard Model. Deviations from SM behaviour are often quantified by extracting the preferred values of the Wilson coefficients of an operator product expansion. We use the module of the package to perform a simultaneous global fit of the Wilson coefficients $$C_7$$ C 7 , $$C_9$$ C 9 , and $$C_{10}$$ C 10 using a combination of all current data on $$b{\rightarrow }s\mu ^{+}\mu ^{-}$$ b → s μ + μ -  transitions. We further extend previous analyses by accounting for the correlated theoretical uncertainties at each point in the Wilson coefficient parameter space, rather than deriving the uncertainties from a Standard Model calculation. We find that the best fit deviates from the SM value with a significance of 6.6$$\sigma $$ σ . The largest deviation is associated with a vector coupling of muons to b and s quarks.

scholarly journals Search for GeV-Scale Sterile Neutrinos Responsible for Active Neutrino Oscillations and Baryon Asymmetry of the Universe

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
S. N. Gninenko ◽  
D. S. Gorbunov ◽  
M. E. Shaposhnikov
Keyword(s):  
Standard Model ◽  
Neutrino Oscillations ◽  
Sterile Neutrino ◽  
High Energy ◽  
Baryon Asymmetry ◽  
Decay Length ◽  
Neutrino Masses ◽  
Sterile Neutrinos ◽  
Active Neutrino ◽  
The Universe

Standard Model fails to explain neutrino oscillations, dark matter, and baryon asymmetry of the Universe. All these problems can be solved with three sterile neutrinos added to SM. Quite remarkably, if sterile neutrino masses are well below the electroweak scale, this modification—Neutrino Minimal Standard Model (νMSM)—can be tested experimentally. We discuss a new experiment on search for decays of GeV-scale sterile neutrinos, which are responsible for the matter-antimatter asymmetry generation and for the active neutrino masses. If lighter than 2 GeV, these particles can be produced in decays of charm mesons generated by high energy protons in a target, and subsequently decay into SM particles. To fully explore this sector ofνMSM, the new experiment requires data obtained with at least1020incident protons on target (achievable at CERN SPS in future) and a big volume detector constructed from a large amount of identical single modules, with a total sterile neutrino decay length of few kilometers. The preliminary feasibility study for the proposed experiment shows that it has sensitivity which may either lead to the discovery of new particles below the Fermi scale—right-handed partners of neutrinos—or rule out seesaw sterile neutrinos with masses below 2 GeV.

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 The Results of MINOS and the Future with MINOS+

2016 ◽  
Vol 2016 ◽  
pp. 1-25 ◽  
Author(s):  
A. Timmons
Keyword(s):  
Precise Measurement ◽  
Sterile Neutrino ◽  
Atmospheric Neutrino ◽  
Mass Hierarchy ◽  
Muon Neutrinos ◽  
Sterile Neutrinos ◽  
Data Set ◽  
Long Baseline ◽  
Numi Beam ◽  
Minos Detectors

The MINOS experiment took data from 2005 up until 2012. The MINOS experiment took data from 2005 up until 2012, continuing beyond that as the MINOS+ experiment. The experiment is a two-detector, on-axis, long-baseline experiment, sending neutrinos from Fermilab to the Soudan Underground Laboratory in northern Minnesota. By searching for the deficit of muon neutrinos at the Far Detector, MINOS/MINOS+ is sensitive to the atmospheric neutrino oscillation parametersΔm322andθ23. By using the full MINOS data set looking at bothνμdisappearance andνeappearance in both neutrino and antineutrino configurations at the NuMI beam along with atmospheric neutrino data recorded at the FD, MINOS has made the most precise measurement ofΔm322. Using a full three-flavour framework and searching forνeappearance, MINOS/MINOS+ gains sensitivity toθ13, the mass hierarchy, and the octant ofθ23. Exotic phenomenon is also explored with the MINOS detectors looking for nonstandard interactions and sterile neutrinos. The current MINOS+ era goals are to build on the previous MINOS results improving the precision on the three-flavour oscillation parameter measurements and strengthening the constraints placed on the sterile neutrino parameter space.

scholarly journals Exploring fake solutions in the sterile neutrino sector at long-baseline experiments

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Sandhya Choubey ◽  
Debajyoti Dutta ◽  
Dipyaman Pramanik
Keyword(s):  
Neutrino Oscillation ◽  
Sterile Neutrino ◽  
Neutrino Mixing ◽  
Neutrino Sector ◽  
Long Baseline ◽  
Fast Oscillations ◽  
Long Baselines

AbstractActive-sterile neutrino mixing is known to affect the neutrino oscillation probabilities at both short as well as long-baselines. In particular, constraints on active-sterile neutrino oscillation parameters can be obtained from long-baseline experiments such as T2HK and DUNE. We present here existence of fake solution in the appearance channel for the 3 + 1 scenario at long-baseline experiments. We show that the appearance probability is same for values of $$\Delta m_{41}^2$$Δm412 for which the fast oscillations are averaged out and for $$\Delta m_{41}^2=(1/2)\Delta m_{31}^2$$Δm412=(1/2)Δm312. The fake solution does not appear for the disappearance channel.

Sign in / Sign up

Export Citation Format

Share Document