These types of signals are a very common path that people who look for new forces follow. The phase space to search for deviations in the standard model is ver

These types of signals are a very common path that people who look for new forces follow. The phase space to search for deviations in the standard model is very big, so when things like this pop up they offer better avenues of exploration than throwing darts. Is it a new force? It looks like the type of particle that would explain it hasn't been entirely ruled out from all the global data we have. If other planned experiments that will be sensitive to the same properties of the proposed particle and aren't dependent on nuclear decays do see it, then there you go. If they don't then they don't.