[Bubble] another application for chamber?

[Jay Benesch]

https://arxiv.org/abs/1805.01028

Eta Decay and Muonic Puzzles
Yu-Sheng Liu, Ian C. Cloët, Gerald A. Miller
(Submitted on 2 May 2018)

     New physics motivated by muonic puzzles (proton radius and muon g−2 
discrepancies) is extensively studied. The scalar boson ϕ, assuming the 
Yukawa interaction, is the only candidate to solve these muonic puzzles 
simultaneously. Our previous work limits the existence of such a scalar 
boson's mass mϕ from about 160 keV to 60 MeV. We improve this result by 
including the influence of all of the possible particles that couple to 
the ϕ in computing the decay rate. Doing this involves including the 
strong interaction physics necessary to compute the ηπϕ vertex function. 
The Nambu-Jona-Lasinio model is employed. Given this information, we 
reanalyze the electron beam dump experiments, with the result is that 
the allowed range of mϕ lies between about 200 keV and 3 MeV. This 
narrow range represents an inviting target for ruling out or discovering 
this scalar boson.

-------------------
skimming the paper: unlikely given allowed coupling coefficients and 
luminosity.  Something to do in UITF?