Search for a light Higgs boson in single-photon decays of $\Upsilon(1S)$ using $\Upsilon(2S) \to \pi^+ \pi^- \Upsilon(1S)$ tagging method

Jia, S.; Shen, C.P.; Adachi, I.; Aihara, H.; Said, S. Al; Asner, D.M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.

doi:10.1103/PhysRevLett.128.081804

Search for a light Higgs boson in single-photon decays of $\Upsilon(1S)$ using $\Upsilon(2S) \to \pi^+ \pi^- \Upsilon(1S)$ tagging method

Belle

Collaboration

Dec 22, 2021

9 pages

Published in:

Phys.Rev.Lett. 128 (2022) 8, 081804

Published: Feb 23, 2022

e-Print:

2112.11852 [hep-ex]

DOI:

10.1103/PhysRevLett.128.081804 (publication)

PDG:

{{\mathit \Upsilon}{(1S)}}

\rightarrow

{{\mathit \gamma}}{{\mathit A}^{0}}

\rightarrow

{{\mathit \gamma}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}

Report number:

Belle Preprint 2021-30; KEK Preprint 2021-35

Experiments:

KEK-BF-BELLE

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Abstract: (APS)

We search for a light Higgs boson (

A^{0}

) decaying into a

τ^{+} τ^{-}

or

μ^{+} μ^{-}

pair in the radiative decays of

ϒ (1 S)

. The production of

ϒ (1 S)

mesons is tagged by

ϒ (2 S) \to π^{+} π^{-} ϒ (1 S)

transitions, using

158 \times 10^{6}

ϒ (2 S)

events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant

A^{0}

signals in the mass range from the

τ^{+} τ^{-}

or

μ^{+} μ^{-}

threshold to

9.2 GeV / c^{2}

are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for

ϒ (1 S) \to γ A^{0}

and

A^{0} \to τ^{+} τ^{-}

varying from

3.8 \times 10^{- 6}

to

1.5 \times 10^{- 4}

. Our results represent an approximately twofold improvement on the current world best upper limits for the

ϒ (1 S) \to γ A^{0} (\to τ^{+} τ^{-})

production. For

A^{0} \to μ^{+} μ^{-}

, the upper limits on the product branching fractions for

ϒ (1 S) \to γ A^{0}

and

A^{0} \to μ^{+} μ^{-}

are at the same level as the world average limits, and vary from

3.1 \times 10^{- 7}

to

1.6 \times 10^{- 5}

. The upper limits at 90% credibility level on the Yukawa coupling

f_{ϒ (1 S)}

and mixing angle

\sin θ_{A^{0}}

are also given.

Note:

9 pages, 5 figures; accepted for publication as a Letter in Physical Review Letters

electron positron: annihilation
electron positron: colliding beams
electron positron: energy
energy: asymmetry
coupling: Yukawa
Upsilon(9460): radiative decay
Upsilon(10020): hadronic decay
branching ratio
Higgs particle: mass
Higgs particle: leptonic decay

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Search for a light Higgs boson in single-photon decays of Υ(1S)\Upsilon(1S)Υ(1S) using Υ(2S)→π+π−Υ(1S)\Upsilon(2S) \to \pi^+ \pi^- \Upsilon(1S)Υ(2S)→π+π−Υ(1S) tagging method

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Search for a light Higgs boson in single-photon decays of $\Upsilon(1S)$ using $\Upsilon(2S) \to \pi^+ \pi^- \Upsilon(1S)$ tagging method