Should U(1) long-range forces be associated to electron, muon and/or tau quantum number then their "fine structure constants" are seen to be bound by nucleosynthesis data to be less than about 1.8 × 10-11. For Tτand μ this is the best upper limit up to date. © 1997 Elsevier Science B.V.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 20 Mar 1997|