scholarly journals Sterile neutrinos produced near the electroweak scale: Mixing angles, MSW resonances, and production rates

2009 ◽  
Vol 80 (10) ◽  
Author(s):  
Jun Wu ◽  
Chiu Man Ho ◽  
Daniel Boyanovsky
Keyword(s):  
Production Rates ◽  
Electroweak Scale ◽  
Sterile Neutrinos ◽  
Mixing Angles

scholarly journals Constraints on the charged currents in general neutrino interactions with sterile neutrinos

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Tong Li ◽  
Xiao-Dong Ma ◽  
Michael A. Schmidt
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Neutral Current ◽  
New Physics ◽  
Effective Field ◽  
Lepton Number ◽  
Low Energy ◽  
Electroweak Scale ◽  
Sterile Neutrinos ◽  
Neutrino Interactions

Abstract In this work we investigate the implication of low-energy precision measurements on the quark-lepton charged currents in general neutrino interactions with sterile neutrinos in effective field theories. The physics in low-energy measurements is described by the low-energy effective field theory extended with sterile neutrinos (LNEFT) defined below the electroweak scale. We also take into account renormalization group running and match the LNEFT onto the Standard Model (SM) effective field theory with sterile neutrinos (SMNEFT) to constrain new physics (NP) above the electroweak scale. The most sensitive low-energy probes are from leptonic decays of pseudoscalar mesons and hadronic tau lepton decays in terms of precise decay branching fractions, the lepton flavor universality and the Cabibbo-Kobayashi-Maskawa (CKM) unitarity. We also consider other constraints including nuclear beta decay. The constraints on charged current operators are generally stronger than the ones for quark-neutrino neutral current operators. We find that the most stringent bounds on the NP scale of lepton-number-conserving and lepton- number-violating operators in SMNEFT are 74 (110) TeV and 9.8 (13) TeV, respectively, for the operators with down (strange) quark.

scholarly journals IceCube Sterile Neutrino Searches

2019 ◽  
Vol 207 ◽  
pp. 04005 ◽  
Author(s):  
B. J. P. Jones
Keyword(s):  
Large Volume ◽  
Sterile Neutrino ◽  
Large Mass ◽  
Neutrino Telescope ◽  
Muon Neutrino ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Mixing Angles ◽  
Neutrino Telescopes ◽  
Ongoing Work

Anomalies in short baseline experiments have been interpreted as evidence for additional neutrino mass states with large mass splittings from the known, active flavors. This explanation mandates a corresponding signature in the muon neutrino disappearance channel, which has yet to be observed. Searches for muon neutrino disappearance at the IceCube neutrino telescope presently provide the strongest limits in the space of mixing angles for eVscale sterile neutrinos. This proceeding for the Very Large Volume Neutrino Telescopes (VLVnT) Workshop summarizes the IceCube analyses that have searched for sterile neutrinos and describes ongoing work toward enhanced, high-statistics sterile neutrino searches.

scholarly journals Search for signatures of sterile neutrinos with Double Chooz

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
T. Abrahão ◽  
H. Almazan ◽  
J. C. dos Anjos ◽  
S. Appel ◽  
J. C. Barriere ◽  
...  
Keyword(s):  
Model Prediction ◽  
Sterile Neutrino ◽  
Profile Likelihood ◽  
Mass Range ◽  
Neutrino Mixing ◽  
Sterile Neutrinos ◽  
Mixing Angles ◽  
Data Comparison ◽  
Mixing Parameter ◽  
Double Chooz

AbstractWe present a search for signatures of neutrino mixing of electron anti-neutrinos with additional hypothetical sterile neutrino flavors using the Double Chooz experiment. The search is based on data from 5 years of operation of Double Chooz, including 2 years in the two-detector configuration. The analysis is based on a profile likelihood, i.e. comparing the data to the model prediction of disappearance in a data-to-data comparison of the two respective detectors. The analysis is optimized for a model of three active and one sterile neutrino. It is sensitive in the typical mass range $${5 \times 10^{-3}}\,\mathrm{eV}^2 \lesssim \varDelta m^2_{41} \lesssim {3 \times 10^{-1}}\,\mathrm{eV}^2 $$ 5 × 10 - 3 eV 2 ≲ Δ m 41 2 ≲ 3 × 10 - 1 eV 2 for mixing angles down to $$\sin ^2 2\theta _{14} \gtrsim {0.02} $$ sin 2 2 θ 14 ≳ 0.02 . No significant disappearance additionally to the conventional disappearance related to $$\theta _{13} $$ θ 13 is observed and correspondingly exclusion bounds on the sterile mixing parameter $$\theta _{14} $$ θ 14 as a function of $$ \varDelta m^2_{41} $$ Δ m 41 2 are obtained.

scholarly journals keV sterile neutrino with large mixing angle is still alive

2018 ◽  
Vol 191 ◽  
pp. 08003
Author(s):  
Anton Chudaykin
Keyword(s):  
Sterile Neutrino ◽  
Sterile Neutrinos ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Hidden Sector ◽  
The Standard Model ◽  
Neutrino Experiments ◽  
Active Mixing ◽  
Neutrino Decay ◽  
Made In

We study production of keV scale sterile neutrinos with large mixing with the Standard Model sector [1]. Conventional mechanism of sterile neutrino generation in the early Universe leads to overproduction of the Dark Matter and strong X-ray signal from sterile neutrino decay. It makes anticipated groundbased experiments on direct searches of sterile-active mixing unfeasible. We argue that for models with a hidden sector coupled to the sterile neutrinos cosmological and astrophysical constraints can be significantly alleviated. In developed scenario a phase transition in the hidden sector modifies the standard oscillation picture and leads to significantly larger mixing angles, thus opening new perspectives for future neutrino experiments such as Troitsk v-mass and KATRIN. This work was made in collaboration with Fedor Bezrukov and Dmitry Gorbunov.

scholarly journals Supernova bounds on keV-mass sterile neutrinos

2015 ◽  
Vol 30 (13) ◽  
pp. 1530033 ◽  
Author(s):  
Shun Zhou
Keyword(s):  
Dark Matter ◽  
Energy Loss ◽  
Cold Dark Matter ◽  
Sterile Neutrino ◽  
Small Scale ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Sterile Neutrinos ◽  
Mixing Angles ◽  
Standard Energy

Sterile neutrinos of keV masses are one of the most promising candidates for the warm dark matter, which could solve the small-scale problems encountered in the scenario of cold dark matter. We present a detailed study of the production of such sterile neutrinos in a supernova core, and derive stringent bounds on the active-sterile neutrino mixing angles and sterile neutrino masses based on the standard energy-loss argument.

scholarly journals STERILE NEUTRINOS AND PULSAR VELOCITIES REVISITED

2012 ◽  
Vol 27 (37) ◽  
pp. 1250215 ◽  
Author(s):  
LEONARD S. KISSLINGER ◽  
MIKKEL B. JOHNSON
Keyword(s):  
Neutron Star ◽  
Sterile Neutrinos ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Wide Range ◽  
Temperature Equilibrium ◽  
Proto Neutron Star

We calculate the momentum given to a proto-neutron star during the first 10 s after temperature equilibrium is reached, using recent evidence of sterile neutrinos and a measurement of the mixing angle. This is a continuation of an earlier estimate with a wide range of possible mixing angles. Using the new mixing angle we find that sterile neutrinos can account for the observed pulsar velocities.

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 Neutrino mixing in nuclear rapid neutron-capture processes

2020 ◽  
Vol 29 (04) ◽  
pp. 2050022
Author(s):  
M. M. Saez ◽  
O. Civitarese ◽  
M. E. Mosquera
Keyword(s):  
Neutron Capture ◽  
Nuclear Reactions ◽  
Decay Rates ◽  
Core Collapse ◽  
Neutrino Mixing ◽  
Sterile Neutrinos ◽  
Mixing Angles ◽  
Core Collapse Supernova ◽  
Neutrino Sector ◽  
Massive Neutrinos

A possible mechanism for the formation of heavy-mass elements in supernovae is the rapid neutron-capture-mechanism ([Formula: see text]-process). It depends upon the electron-fraction [Formula: see text], a quantity which is determined by beta-decay-rates. In this paper, we focus on the calculation of electroweak decay-rates in presence of massive neutrinos. The resulting expressions are then used to calculate nuclear reactions entering the rapid-neutron capture. We fix the astrophysical parameters to the case of a core-collapse supernova. The neutrino sector includes a mass scheme and mixing angles for active neutrinos, and also by including the mixing between active and sterile neutrinos. The results of the calculations show that the predicted abundances of heavy-mass nuclei are indeed affected by the neutrino mixing.

scholarly journals Numerical estimate of minimal active-sterile neutrino mixing

2018 ◽  
Vol 191 ◽  
pp. 03003
Author(s):  
Igor Krasnov
Keyword(s):  
Neutrino Mass ◽  
Sterile Neutrino ◽  
Numerical Estimate ◽  
Strong Dependence ◽  
Type I ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Sterile Neutrinos ◽  
Mixing Angles ◽  
Active Neutrino

Seesaw mechanism constrains from below mixing between active and sterile neutrinos for fixed sterile neutrino masses. Signal events associated with sterile neutrino decays inside a detector at fixed target experiment are suppressed by the mixing angle to the power of four. Therefore sensitivity of experiments such as SHiP and DUNE should take into account minimal possible values of the mixing angles. We extend the previous study of this subject [1] to a more general case of non-zero CP-violating phases in the neutrino sector. Namely, we provide numerical estimate of minimal value of mixing angles between active neutrinos and two sterile neutrinos with the third sterile neutrino playing no noticeable role in the mixing. Thus we obtain a sensitivity needed to fully explore the seesaw type I mechanism for sterile neutrinos with masses below 2 GeV, and one undetectable sterile neutrino that is relevant for the fixedtarget experiments. Remarkably, we observe a strong dependence of this result on the lightest active neutrino mass and the neutrino mass hierarchy, not only on the values of CP-violating phases themselves. All these effects sum up to push the limit of experimental confirmation of sterile-active neutrino mixing by several orders of magnitude below the results of [1] from 10-10 - 10-11 down to 10-12 and even to 10-20 in parts of parameter space; non-zero CP-violating phases are responsible for that.

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