Heavy QCD axion in b→s transition: Enhanced limits and projections

@article{Chakraborty2021HeavyQA,
  title={Heavy QCD axion in 
b→s
 transition: Enhanced limits and projections},
  author={Sabyasachi Chakraborty and Manfred Kraus and Vazha Loladze and Takemichi Okui and Kohsaku Tobioka},
  journal={Physical Review D},
  year={2021}
}
We study a “heavy” QCD axion whose coupling to the standard model is dominated by aGG̃ but with ma mπfπ/fa. This is well motivated as it can solve the strong CP problem while evading the axion quality problem. It also poses interesting challenges for its experimental search due to its suppressed couplings to photons and leptons. Such axion with mass around a GeV is kinematically inaccessible or poorly constrained by most experimental probes except B-factories. We study B → Ka transitions as a… 
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