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Why can't neutral pion decay to two neutrino's

I think the best answer is a chirality argument, much in the same way that $\Gamma( \pi^- \to \mu^- \overline{\nu}_\mu) \gg \Gamma (\pi^- \to e^- \overline{\nu}_e)$. See here. A $\pi^0$ has a $J^P = 0^...
Josh's user avatar
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5 votes

Quark condensate and VEV of $\pi^0$

Nonono! You've made a bad hash of standard notation. The interpolating operator for the neutral pion you wrote is far too schematic/complacent, and lacks an all-important $\gamma^5$. You might ...
Cosmas Zachos's user avatar

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