Search for Lepton Flavor Violation in $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$

Lees, J.P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D.N.; Kolomensky, Yu.G.; Fritsch, M.; Koch, H.

doi:10.1103/PhysRevLett.128.091804

Search for Lepton Flavor Violation in $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$

BaBar

Collaboration

Sep 7, 2021

7 pages

Published in:

Phys.Rev.Lett. 128 (2022) 9, 091804

Published: Mar 3, 2022

e-Print:

2109.03364 [hep-ex]

DOI:

10.1103/PhysRevLett.128.091804 (publication)

PDG:

{{\mathit \Upsilon}{(3S)}}

\rightarrow

{{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}

Report number:

BABAR-PUB-21/003,
SLAC-PUB-17617

Experiments:

SLAC-PEP2-BABAR

View in:

pdf

reference search10 citations

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Abstract: (APS)

We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a

b

quark and

b

antiquark bound state. We look for the LFV decay

ϒ (3 S) \to e^{\pm} μ^{\mp}

in a sample of 118 million

ϒ (3 S)

mesons from

27 {fb}^{- 1}

of data collected with the BABAR detector at the SLAC PEP-II

e^{+} e^{-}

collider operating with a 10.36 GeV center-of-mass energy. No evidence for a signal is found, and we set a limit on the branching fraction

B [ϒ (3 S) \to e^{\pm} μ^{\mp}] < 3.6 \times 10^{- 7}

at 90% C. L. This result can be interpreted as a limit

Λ_{NP} / g_{NP}^{2} > 80 TeV

on the energy scale

Λ_{NP}

divided by the coupling-squared

g_{NP}^{2}

of relevant new physics (NP).

11.30.j
11.30.Fs
13.20.Gd
13.20.v
14.40.Gx
14.40.n
14.60.-z
14.60.Cd
14.60.Ef
14.65.Fy

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Search for Lepton Flavor Violation in Υ(3S)→e±μ∓\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}Υ(3S)→e±μ∓

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Search for Lepton Flavor Violation in $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$