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Setting Limits on Supersymmetry Using Simplified Models
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Search for Axionlike Particles Produced in e^{+}e^{-} Collisions at Belle II.

F Abudinén1, I Adachi2,3, H Aihara4

  • 1INFN Sezione di Trieste, I-34127 Trieste.

Physical Review Letters
|October 30, 2020
PubMed
Summary
This summary is machine-generated.

Researchers searched for light pseudoscalar particles (axionlike particles or ALPs) decaying into two photons using Belle II data. No evidence was found, leading to the most restrictive limits to date for ALPs in a specific mass range.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Beyond Standard Model Physics

Background:

  • Axionlike particles (ALPs) are hypothetical light pseudoscalar particles.
  • ALPs are predicted by extensions of the Standard Model, interacting with gauge bosons.
  • Searches for ALPs probe fundamental physics beyond established theories.

Purpose of the Study:

  • To search for the direct production of light pseudoscalar particles (ALPs) decaying into two photons.
  • To investigate the process e^{+}e^{-}→γa, a→γγ at the Belle II detector.
  • To set limits on the coupling strength of ALPs to photons.

Main Methods:

  • Utilized data from the Belle II detector at the SuperKEKB collider.
  • Analyzed electron-positron collision data corresponding to an integrated luminosity of (445±3) pb^{-1}.
  • Searched for a→γγ decays within the mass range 0.2

Main Results:

  • No significant evidence for the direct production of ALPs was observed.
  • Set 95% confidence level upper limits on the ALP-photon coupling strength (g_{aγγ}) at the level of 10^{-3} GeV^{-1}.
  • Established the most restrictive limits to date for ALPs in the mass range 0.2

Conclusions:

  • The search places stringent constraints on the existence of light ALPs in the studied mass range.
  • The results contribute to narrowing the parameter space for ALPs and theories beyond the Standard Model.
  • Future searches with increased luminosity at Belle II can further probe ALP properties.