Search for heavy neutral leptons using tau lepton decays at BaBaR - INSPIRE

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Search for heavy neutral leptons using tau lepton decays at BaBaR

BaBar

Collaboration

•

J.P. Lees

Jul 19, 2022

20 pages

Published in:

Phys.Rev.D 107 (2023) 5, 052009

Published: Mar 1, 2023

e-Print:

2207.09575 [hep-ex]

DOI:

10.1103/PhysRevD.107.052009 (publication)

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

Report number:

BABAR-PUB-22/002,
SLAC-PUB-17695

Experiments:

SLAC-PEP2-BABAR

View in:

ADS Abstract Service

reference search25 citations

Citations per year

Abstract: (APS)

This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model

τ

neutrino with a mixing strength of

| U_{τ 4} |^{2}

, corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of

424 {fb}^{- 1}

, are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on

| U_{τ 4} |^{2}

at the 95% confidence level, depend on the HNL mass hypothesis and vary from

2.31 \times 10^{- 2}

to

5.04 \times 10^{- 6}

(with all uncertainties considered), across the mass range

100 < m_{4} < 1300 MeV / c^{2}

; the more stringent limits being placed at higher masses.

Note:

20 pages, 10 figures

electron positron: annihilation
electron positron: colliding beams
tau: decay
lepton: heavy
neutrino: heavy
neutrino: mixing
neutrino: decay modes
kinematics
neutrino: lifetime
neutrino: sterile

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