# Klein-gordan eqn

#### captain

I am having trouble understand why the klein-gordan eqn is accepted to describe spin 0 particles since it gives the wrong statistical interpretation (such as negative probablities).

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#### Fra

I am having trouble understand why the klein-gordan eqn is accepted to describe spin 0 particles since it gives the wrong statistical interpretation (such as negative probablities).
Why have we not observed any supposedly fundamental spin-0 particles in nature? :)

(higgs hasn't been observed)

/Fredrik

#### clem

I am having trouble understand why the klein-gordan eqn is accepted to describe spin 0 particles since it gives the wrong statistical interpretation (such as negative probablities).
The Klein-Gordan equation has to be second quantized to get to a QM wave function.
As a one particle equation, $$\psi^*\psi$$ relates to the charge density.

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