24-27 November 2022
Karlsruhe Institute of Technology
Europe/Berlin timezone

Sensitivity studies for eV scale sterile neutrino searches with KATRIN

26 Nov 2022, 16:00
2h
Foyer (KIT Campus South)

Foyer

KIT Campus South

KIT Campus map: https://www.kit.edu/campusplan/ Building: 30.22 Room: Foyer im 1. und 2. OG Address: Institute of Technology, Engesserstraße 7, 76131 Karlsruhe Coordinates: 49.01244, 8.41062
Poster Physics Posters Poster session

Speaker

Ms. Shailaja Mohanty (IAP, Karlsruhe Institute of Technology)

Description

KATRIN has recently reported an unrivalled sub-eV direct constraint of the neutrino mass from tritium beta-decay spectrum measurements [1]. Along with the neutrino-mass search, KATRIN has published first results of searching for a fourth (sterile) neutrino with a mass in the eV-range using the precision beta-decay spectra[2],[3].

The fourth neutrino mass-eigenstate introduces an additional branch into the tritium $\beta$-spectrum which manifests as a kink in the model of the differential spectrum. Position and amplitude of this kink correspond to the sterile neutrino mass $m_4$ and effective mixing angle sin$^2(\theta) = |U_{e4}|^{2}$, respectively. In this work sensitivity studies to light sterile neutrinos based on additional science runs and the effect of systematic uncertainties are presented. The analysis region is a two-dimensional parameter space given by $m_4^2<1000$ eV$^2$ and sin$^2(\theta)<5\times 10^{-1}$. A scanning grid with 50$\times$50 points in the ($m_4^2$, sin$^2(\theta)$) plane is chosen and sensitivity contours are calculated within this parameter space. Future strategies for a combined analysis of successive measurement campaigns are discussed.

References:
[1] Direct neutrino-mass measurement with sub-electronvolt sensitivity, KATRIN Collaboration, Nature Phys. 18 (2022) 2, 160-166
[2] Bound on 3+1 Active-Sterile Neutrino Mixing from the First Four-Week Science Run of KATRIN, DOI: 10.1103/PhysRevLett.126.091803,(2021), KATRIN Collaboration
[3] Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign, DOI: 10.1103/PhysRevD.105.072004},(2022), KATRIN Collaboration

Category Particle / Astroparticle / Cosmology (Experiment)

Primary author

Ms. Shailaja Mohanty (IAP, Karlsruhe Institute of Technology)

Presentation Materials

There are no materials yet.
Your browser is out of date!

Update your browser to view this website correctly. Update my browser now

×