Search for a Heavy Neutrino in <math display="inline"><mi>τ</mi></math> Decays at Belle

Liventsev, D.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D.M.; Atmacan, H.; Ayad, R.; Babu, V.; Banerjee, Sw.; Bauer, M.

doi:10.1103/PhysRevLett.131.211802

Search for a Heavy Neutrino in $τ$ Decays at Belle

Belle

Collaboration

•

D. Liventsev

Dec 20, 2022

13 pages

Published in:

Phys.Rev.Lett. 131 (2023) 21, 211802

Published: Nov 22, 2023

e-Print:

2212.10095 [hep-ex]

DOI:

10.1103/PhysRevLett.131.211802 (publication)

PDG: Limits on

\vert {{\mathit U}}_{{{\mathit \tau}} {{\mathit x}}}\vert ^2

Report number:

Belle Preprint 2022-27,
KEK Preprint 2022-36

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

pdf

reference search8 citations

Citations per year

Abstract: (APS)

We report on a search for a heavy Majorana neutrino in the decays

τ^{-} \to π^{-} ν_{h}

,

ν_{h} \to π^{\pm} ℓ^{\mp}

,

ℓ = e

,

μ

. The results are obtained using the full data sample of

988 {fb}^{- 1}

collected with the Belle detector at the KEKB asymmetric energy

e^{+} e^{-}

collider, which contains

912 \times 10^{6} τ τ

pairs. We observe no significant signal and set 95% CL upper limits on the couplings of the heavy right-handed neutrinos to the conventional standard model left-handed neutrinos in the mass range

0.2 - 1.6 GeV / c^{2}

. This is the first study of a mixed couplings of heavy neutrinos to

τ

leptons and light-flavor leptons.

Note:

13 pages, 6 figures, 2 tables, including supplemental material. Published by PRL. arXiv admin note: text overlap with arXiv:1301.1105

electron positron: annihilation
electron positron: colliding beams
neutrino: heavy
neutrino: semileptonic decay
neutrino: left-handed
neutrino: right-handed
tau: semileptonic decay
tau: decay modes
BELLE
KEK-B

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