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Search for Axion-Like Particles produced in $e^+e^-$ collisions at Belle II
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arxiv 2007.13071 v3 pith:RWFJNYQB submitted 2020-07-26 hep-ex
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abstract
We present a search for the direct production of a light pseudoscalar $a$ decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process ${e^+e^-\to\gamma a, a \to\gamma\gamma}$ in the mass range ${0.2} \,< m_a < {9.7}\,{\text{GeV/$c$}^2}$ using data corresponding to an integrated luminosity of $(445\pm 3)\,\text{pb}^{-1}$. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axion-like particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength $g_{a\gamma\gamma}$ of ALPs to photons at the level of $10^{-3}\,{\text{GeV}^{-1}}$. The limits are the most restrictive to date for $0.2\,<\,m_a\,<\,1\,{\text{GeV/$c$}^2}$.
Forward citations
Cited by 3 Pith papers
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Searching for long-lived ALPs with a laser-assisted optical dump
hep-ph 2026-07 conditional novelty 6.0 of 10
A laser-assisted optical dump could probe ALP-electron couplings down to ~10^-6 (10^-7) GeV^-1 with 16.5 (125) GeV electron beams, and when both couplings are present the Primakoff process improves the electron-coupli...
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Real-time graph neural networks on FPGAs for the Belle II electromagnetic calorimeter
physics.ins-det 2026-02 conditional novelty 6.0 of 10
A GNN-based calorimeter clustering and signal classifier ran on an FPGA inside the Belle II L1 trigger readout path, improving position resolution and photon separation at the cost of exceeding the trigger decision latency.
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Axions and Axion-like particles: collider searches
hep-ph 2025-08 accept
A pedagogical review of the ALP effective field theory, production and decay at colliders, indirect search strategies, and a summary of current bounds on the ALP-photon coupling.
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