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

[Matt Graham]

I'm assuming BaBar (and Belle, if they ever publish) has killed off up 
to 10GeV at that (fairly large) coupling...

I don't think there is a public result from KTeV ...  I've seen a plot 
of the e+e- invariant mass from them in an paper, but as far as I know 
there isn't anywhere with the next steps to get a limit on coupling.

On 1/31/2013 7:17 PM, Yuri Gershtein wrote:
> 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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