Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign - INSPIRE

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Improved eV-scale sterile-neutrino constraints from the second KATRIN measurement campaign

KATRIN

Collaboration

•

M. Aker
(
- KIT, Karlsruhe, IAP
)

Jan 27, 2022

14 pages

Published in:

Phys.Rev.D 105 (2022) 7, 072004

Published: Apr 1, 2022

e-Print:

2201.11593 [hep-ex]

DOI:

10.1103/PhysRevD.105.072004 (publication)

PDG: Search for

{{\mathit \nu}_{{{\mu}}}}

{{\mathit \nu}_{{{e}}}}

\rightarrow

{{\mathit \nu}_{{{s}}}}

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Abstract: (APS)

We present the results of the light sterile neutrino search from the second Karlsruhe Tritium Neutrino (KATRIN) measurement campaign in 2019. Approaching nominal activity,

3.76 \times 10^{6}

tritium

β

-electrons are analyzed in an energy window extending down to 40 eV below the tritium end point at

E_{0} = 18.57 keV

. We consider the

3 ν + 1

framework with three active and one sterile neutrino flavors. The analysis is sensitive to a fourth mass eigenstate

m_{4}^{2} ≲ 1600 {eV}^{2}

and active-to-sterile mixing

| U_{e 4} |^{2} ≳ 6 \times 10^{- 3}

. As no sterile-neutrino signal was observed, we provide improved exclusion contours on

m_{4}^{2}

and

| U_{e 4} |^{2}

at 95% C.L. Our results supersede the limits from the Mainz and Troitsk experiments. Furthermore, we are able to exclude the large

Δ m_{41}^{2}

solutions of the reactor antineutrino and gallium anomalies to a great extent. The latter has recently been reaffirmed by the BEST Collaboration and could be explained by a sterile neutrino with large mixing. While the remaining solutions at small

Δ m_{41}^{2}

are mostly excluded by short-baseline reactor experiments, KATRIN is the only ongoing laboratory experiment to be sensitive to relevant solutions at large

Δ m_{41}^{2}

through a robust spectral shape analysis.

Note:

14 pages, 8 figures, 2 tables

neutrino: sterile
neutrino: flavor
antineutrino: nuclear reactor
KATRIN
tritium: semileptonic decay
neutrino: mixing
neutrino: mass difference
spectral
gallium
shape analysis

References(42)

Figures(8)

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