# Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN

## Abstract

The KATRIN experiment aims to determine the absolute neutrino mass by measuring the endpoint region of the tritium β-spectrum. As a large-scale experiment with a sharp energy resolution, high source luminosity and low background it may also be capable of testing certain theories of neutrino interactions beyond the standard model (SM). An example of a non-SM interaction are right-handed currents mediated by right-handed W bosons in the left-right symmetric model (LRSM). In this extension of the SM, an additional SU(2){sub R} symmetry in the high-energy limit is introduced, which naturally includes sterile neutrinos and predicts the seesaw mechanism. In tritium β decay, this leads to an additional term from interference between left- and right-handed interactions, which enhances or suppresses certain regions near the endpoint of the beta spectrum. In this work, the sensitivity of KATRIN to right-handed currents is estimated for the scenario of a light sterile neutrino with a mass of some eV. This analysis has been performed with a Bayesian analysis using Markov Chain Monte Carlo (MCMC). The simulations show that, in principle, KATRIN will be able to set sterile neutrino mass-dependent limits on the interference strength. The sensitivity is significantly increased if the Q value of themore »

- Authors:

- Institute for Nuclear Physics, University of Münster, Wilhelm Klemm-Str. 9, 41849 Münster (Germany)
- Institute for Nuclear Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe (Germany)
- Institute of Experimental Nuclear Physics, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe (Germany)
- Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C (Denmark)

- Publication Date:

- OSTI Identifier:
- 22676170

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 06; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BETA DECAY; BETA SPECTRA; CERN LHC; ENERGY RESOLUTION; INTERFERENCE; LUMINOSITY; MARKOV PROCESS; MASS; MONTE CARLO METHOD; Q-VALUE; SENSITIVITY; SIMULATION; STANDARD MODEL; STERILE NEUTRINOS; SU-2 GROUPS; SYMMETRY; VISIBLE RADIATION; W MINUS BOSONS; W PLUS BOSONS

### Citation Formats

```
Steinbrink, Nicholas M.N., Weinheimer, Christian, Glück, Ferenc, Valerius, Kathrin, Heizmann, Florian, Kleesiek, Marco, and Hannestad, Steen, E-mail: n.steinbrink@uni-muenster.de, E-mail: ferenc.glueck@kit.edu, E-mail: florian.heizmann@kit.edu, E-mail: marco.kleesiek@kit.edu, E-mail: kathrin.valerius@kit.edu, E-mail: weinheimer@uni-muenster.de, E-mail: steen@phys.au.dk.
```*Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN*. United States: N. p., 2017.
Web. doi:10.1088/1475-7516/2017/06/015.

```
Steinbrink, Nicholas M.N., Weinheimer, Christian, Glück, Ferenc, Valerius, Kathrin, Heizmann, Florian, Kleesiek, Marco, & Hannestad, Steen, E-mail: n.steinbrink@uni-muenster.de, E-mail: ferenc.glueck@kit.edu, E-mail: florian.heizmann@kit.edu, E-mail: marco.kleesiek@kit.edu, E-mail: kathrin.valerius@kit.edu, E-mail: weinheimer@uni-muenster.de, E-mail: steen@phys.au.dk.
```*Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN*. United States. doi:10.1088/1475-7516/2017/06/015.

```
Steinbrink, Nicholas M.N., Weinheimer, Christian, Glück, Ferenc, Valerius, Kathrin, Heizmann, Florian, Kleesiek, Marco, and Hannestad, Steen, E-mail: n.steinbrink@uni-muenster.de, E-mail: ferenc.glueck@kit.edu, E-mail: florian.heizmann@kit.edu, E-mail: marco.kleesiek@kit.edu, E-mail: kathrin.valerius@kit.edu, E-mail: weinheimer@uni-muenster.de, E-mail: steen@phys.au.dk. Thu .
"Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN". United States. doi:10.1088/1475-7516/2017/06/015.
```

```
@article{osti_22676170,
```

title = {Statistical sensitivity on right-handed currents in presence of eV scale sterile neutrinos with KATRIN},

author = {Steinbrink, Nicholas M.N. and Weinheimer, Christian and Glück, Ferenc and Valerius, Kathrin and Heizmann, Florian and Kleesiek, Marco and Hannestad, Steen, E-mail: n.steinbrink@uni-muenster.de, E-mail: ferenc.glueck@kit.edu, E-mail: florian.heizmann@kit.edu, E-mail: marco.kleesiek@kit.edu, E-mail: kathrin.valerius@kit.edu, E-mail: weinheimer@uni-muenster.de, E-mail: steen@phys.au.dk},

abstractNote = {The KATRIN experiment aims to determine the absolute neutrino mass by measuring the endpoint region of the tritium β-spectrum. As a large-scale experiment with a sharp energy resolution, high source luminosity and low background it may also be capable of testing certain theories of neutrino interactions beyond the standard model (SM). An example of a non-SM interaction are right-handed currents mediated by right-handed W bosons in the left-right symmetric model (LRSM). In this extension of the SM, an additional SU(2){sub R} symmetry in the high-energy limit is introduced, which naturally includes sterile neutrinos and predicts the seesaw mechanism. In tritium β decay, this leads to an additional term from interference between left- and right-handed interactions, which enhances or suppresses certain regions near the endpoint of the beta spectrum. In this work, the sensitivity of KATRIN to right-handed currents is estimated for the scenario of a light sterile neutrino with a mass of some eV. This analysis has been performed with a Bayesian analysis using Markov Chain Monte Carlo (MCMC). The simulations show that, in principle, KATRIN will be able to set sterile neutrino mass-dependent limits on the interference strength. The sensitivity is significantly increased if the Q value of the β decay can be sufficiently constrained. However, the sensitivity is not high enough to improve current upper limits from right-handed W boson searches at the LHC.},

doi = {10.1088/1475-7516/2017/06/015},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 06,

volume = 2017,

place = {United States},

year = {Thu Jun 01 00:00:00 EDT 2017},

month = {Thu Jun 01 00:00:00 EDT 2017}

}