Proton radius puzzle tie in?
I wonder what the chances are that this links to the proton radius puzzle?
Here they are talking about a force-carrying boson that interacts primarily with electrons. It doesn't sound too far fetched that it would interact with muons in an unexpected way, and the paper highlights a possibility. That might shine some light on the proton radius measurements, which are unexpectedly inconsistent when measured with muons c.f. electrons.
Too bad my particle physics and math aren't of the required standard.