# A new light boson

@article{Weinberg1978ANL, title={A new light boson}, author={S. Weinberg}, journal={Physical Review Letters}, year={1978}, volume={40}, pages={223-226} }

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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VoLUMK 40, +UMBER 4 PHYSICAL REVIEW LETTERS 2)

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This lower bound does not apply here, because U(1)pp requires at least two scalar doublets. ) Empirical lower bounds on Higgs boson masses have been discussed by

- This lower bound does not apply here, because U(1)pp requires at least two scalar doublets. ) Empirical lower bounds on Higgs boson masses have been discussed by
- 1976

and references cited therein. However, these bounds refer specifically to 0+ particles, not to a 0 particle like the axlon, For a review

- and references cited therein. However, these bounds refer specifically to 0+ particles, not to a 0 particle like the axlon, For a review
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