A New Light Boson

@inproceedings{Weinberg1978ANL,
  title={A New Light Boson},
  author={Steven Weinberg},
  year={1978}
}
It is pointed out that a global U(1) symmetry, that has been introduced in order to preserve the parity and time-reversal invariance of strong interactions despite the effects of instantons, would lead to a neutral pseudoscalar boson, the ''axion,'' with mass roughly of order 100 keV to 1 MeV. Experimental implications are discussed. 

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