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Search for Axion-Like Particles produced in $e^+e^-$ collisions at Belle II
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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 7 Pith papers
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Real-time graph neural networks on FPGAs for the Belle II electromagnetic calorimeter
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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New Physics at the Muon (Synchrotron) Ion Collider: MuSIC for several scales
A TeV-scale muon-ion collider (MuSIC) could probe new physics in four BSM scenarios with reach surpassing the HL-LHC and other future facilities.
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Probing Heavy Axion-like Particles from Massive Stars with X-rays and Gamma Rays
Decay photons from heavy ALPs produced in Wolf-Rayet stars can be probed by INTEGRAL SPI down to gaγ ~ 4e-11 GeV^-1 for ma ~ 10-100 keV, modestly extending existing limits.
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Dark photons and axion-like particles at the Electron-Ion Collider in China
Projected EicC searches could probe dark photons from about 1 MeV to 3 GeV and photon-coupled axion-like particles from 0.1 to 5 GeV, covering parameter space not yet excluded by other experiments.
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Measurement of light-by-light scattering and the Breit-Wheeler process, and search for axion-like particles in ultraperipheral PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV
In PbPb ultraperipheral collisions at 5.02 TeV, CMS measured the Breit-Wheeler and light-by-light fiducial cross sections in agreement with QED and set the most stringent axion-like particle limits in the 5-10 GeV mass range.
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Axions and Axion-like particles: collider searches
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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