Search for an Invisible <math display="inline"><msup><mi>Z</mi><mo>′</mo></msup></math> in a Final State with Two Muons and Missing Energy at Belle II

Adachi, I.; Adamczyk, K.; Aggarwal, L.; Ahmed, H.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D.M.; Aushev, T.

doi:10.1103/PhysRevLett.130.231801

Search for an Invisible $Z^{'}$ in a Final State with Two Muons and Missing Energy at Belle II

Belle-II

Collaboration

Dec 6, 2022

14 pages

Published in:

Phys.Rev.Lett. 130 (2023) 23, 231801

Published: Jun 7, 2023

e-Print:

2212.03066 [hep-ex]

DOI:

10.1103/PhysRevLett.130.231801 (publication)

PDG: Limits for other

{{\mathit Z}^{\,'}}

Report number:

Belle II Preprint 2022-008,
KEK Preprint 2022-40

Experiments:

KEK-BF-BELLE-II

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Abstract: (APS)

The

L_{μ} - L_{τ}

extension of the standard model predicts the existence of a lepton-flavor-universality-violating

Z^{'}

boson that couples only to the heavier lepton families. We search for such a

Z^{'}

through its invisible decay in the process

e^{+} e^{-} \to μ^{+} μ^{-} Z^{'}

. We use a sample of electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019–2020, corresponding to an integrated luminosity of

79.7 {fb}^{- 1}

. We find no excess over the expected standard-model background. We set 90%-confidence-level upper limits on the cross section for this process as well as on the coupling of the model, which ranges from

3 \times 10^{- 3}

at low

Z^{'}

masses to 1 at

Z^{'}

masses of

8 GeV / c^{2}

.

electron positron: annihilation
electron positron: colliding beams
lepton: flavor: universality
lepton: flavor: violation
lepton: universality: violation
Z': electroproduction
Z': associated production
Z': mass
lepton: family
lepton number: conservation law

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Search for an Invisible Z′ in a Final State with Two Muons and Missing Energy at Belle II

Citations per year

Search for an Invisible $Z^{'}$ in a Final State with Two Muons and Missing Energy at Belle II