Low-energy probes of sterile neutrino transition magnetic moments

Abstract Sterile neutrinos with keV-MeV masses and non-zero transition magnetic moments can be probed through low-energy nuclear or electron recoil measurements. Here we determine the sensitivities of current and future searches, showing how they can probe a previously unexplored parameter region. Future coherent elastic neutrino-nucleus scattering (CEνNS) or elastic neutrino-electron scattering (EνES) experiments using a monochromatic 51Cr source can fully probe the region indicated by the recent XENON1T excess.

Download Full-text

Probing neutrino dipole portal at COHERENT experiment

Journal of High Energy Physics ◽

10.1007/jhep11(2021)120 ◽

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.

Download Full-text

Sterile Neutrino Fits to Short-Baseline Neutrino Oscillation Measurements

Advances in High Energy Physics ◽

10.1155/2013/163897 ◽

2013 ◽

Vol 2013 ◽

pp. 1-26 ◽

Cited By ~ 103

Author(s):

J. M. Conrad ◽

C. M. Ignarra ◽

G. Karagiorgi ◽

M. H. Shaevitz ◽

J. Spitz

Keyword(s):

Neutrino Oscillation ◽

Neutrino Mass ◽

Goodness Of Fit ◽

Sterile Neutrino ◽

Low Energy ◽

Data Sets ◽

Sterile Neutrinos ◽

Short Baseline ◽

Energy Excess ◽

Global Fit

This paper reviews short-baseline oscillation experiments as interpreted within the context of one, two, and three sterile neutrino models associated with additional neutrino mass states in the~1 eV range. Appearance and disappearance signals and limits are considered. We show that fitting short-baseline datasets to a 3 + 3 (3 + 2) model, defined by three active and three (two) sterile neutrinos, results in an overall goodness of fit of 67% (69%) and good compatibility between data sets—to be compared to a 3 + 1 model with a 55% goodness of fit. While the (3 + 3) fit yields the highest quality overall, it still finds inconsistencies with the MiniBooNE appearance datasets; in particular, the global fit fails to account for the observed MiniBooNE low-energy excess. Given the overall improvement, we recommend using the results of (3 + 2) and (3 + 3) fits, rather than (3 + 1) fits, for future neutrino oscillation phenomenology. These results motivate the pursuit of further short-baseline experiments, such as those reviewed in this paper.

Download Full-text

Heavy Sterile Neutrino in Dark Matter Searches

Advances in High Energy Physics ◽

10.1155/2018/1479313 ◽

2018 ◽

Vol 2018 ◽

pp. 1-14 ◽

Cited By ~ 2

Author(s):

Paraskevi C. Divari ◽

John D. Vergados

Keyword(s):

Dark Matter ◽

Kinetic Energy ◽

Low Temperatures ◽

Sterile Neutrino ◽

Event Rate ◽

Sterile Neutrinos ◽

Point Energy ◽

Electron Recoil ◽

Atomic Excitations ◽

Detection Mechanisms

Sterile neutrinos are possible dark matter candidates. We examine here possible detection mechanisms, assuming that the neutrino has a mass of about 50 keV and couples to the ordinary neutrino. Even though this neutrino is quite heavy, it is nonrelativistic with a maximum kinetic energy of 0.1 eV. Thus new experimental techniques are required for its detection. We estimate the expected event rate in the following cases: (i) measuring electron recoil in the case of materials with very low electron binding; (ii) low temperature crystal bolometers; (iii) spin induced atomic excitations at very low temperatures, leading to a characteristic photon spectrum; (iv) observation of resonances in antineutrino absorption by a nucleus undergoing electron capture; (v) neutrino induced electron events beyond the end point energy of beta decaying systems, for example, in the tritium decay studied by KATRIN.

Download Full-text