[Hps] Constraints on dark photons from $π^0$ decays

[Yuri Gershtein]

Hi Graham,

you mean 100 MeV, not 10 GeV, right?

I'm also a bit confused by the paper.
They look for it in Dalitz pi0 decays, but somehow 
claim that this is the first time it's done?

I thought KTeV had way more stats and excluded 
epison^2 down to 5 e-7 or so? 

I can't seem to find the plot now, though, I'll look tomorrow.

-y

On Jan 31, 2013, at 9:58 PM, Graham, Mathew Thomas wrote:

> 
> From Russia, with pi0's.
> http://arxiv.org/abs/1301.7555
> 
> …they exclude just a bit of unique space…it's pretty safe to say there is no A' with coupling >5x10^3 (at least up to 10GeV).
> 
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