Search for a <math display="inline"><msup><mi>μ</mi><mo>+</mo></msup><msup><mi>μ</mi><mo>-</mo></msup></math> resonance in four-muon final states at Belle II - INSPIRE

DataBETA

Search for a $μ^{+} μ^{-}$ resonance in four-muon final states at Belle II

Belle-II

Collaboration

Mar 5, 2024

13 pages

Published in:

Phys.Rev.D 109 (2024) 11, 112015

Published: Jun 1, 2024

e-Print:

2403.02841 [hep-ex]

DOI:

10.1103/PhysRevD.109.112015 (publication)

Report number:

2024-007,
2023-55

Experiments:

KEK-BF-BELLE-II

View in:

ADS Abstract Service

reference search10 citations

Citations per year

Abstract: (APS)

We report on a search for a resonance

X

decaying to a pair of muons in

e^{+} e^{-} \to μ^{+} μ^{-} X

events in the

0.212 - 9.000 GeV / c^{2}

mass range, using

178 {fb}^{- 1}

of data collected by the Belle II experiment at the SuperKEKB collider at a center of mass energy of 10.58 GeV. The analysis probes two different models of

X

beyond the standard model: a

Z^{'}

vector boson in the

L_{μ} - L_{τ}

model and a muonphilic scalar. We observe no evidence for a signal and set exclusion limits at the 90% confidence level on the products of cross section and branching fraction for these processes, ranging from 0.046 fb to 0.97 fb for the

L_{μ} - L_{τ}

model and from 0.055 fb to 1.3 fb for the muonphilic scalar model. For masses below

6 GeV / c^{2}

, the corresponding constraints on the couplings of these processes to the standard model range from 0.0008 to 0.039 for the

L_{μ} - L_{τ}

model and from 0.0018 to 0.040 for the muonphilic scalar model. These are the first constraints on the muonphilic scalar from a dedicated search.

electron positron: annihilation
electron positron: colliding beams
resonance: production
resonance: leptonic decay
Z': leptonic decay
model: scalar
muon: pair production
final state: (4lepton)
lepton number
BELLE

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Figures(20)

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