Calculated properties of μ-mesonic atoms

Phenomenological consequences of singlet neutrinos

“…For [18] and Z ef f = 17.6 [19]. From the present data [10], the branching ratios, B(µ → eγ), B(µ → 3e) and B(µ T i → e T i) = Γ(µ T i → e T i)/Γ(µ − capture) are 4.9 × 10 −11 , 1.0 × 10 −12 and 4.6 × 10 −12 , respectively, which translate into At the first sight, it would seem that µ → eγ provides the most stringent constraint among all three processes.…”

“…Within the standard model, this situation is accomodated quite naturally by restricting Higgs fields to the usual isodoublets, so that there are no direct Yukawa couplings among the left-handed lepton fields and scalar bosons. Nevertheless, gravity effects could induce a dimension five operator, but these would imply Majorana neutrino masses of the order m ν ∼ v 2 /M P l ∼ 10 −5 eV , where v = 250 GeV is the scale of electroweak breaking and M P l = 10 19 GeV is the Planck mass.…”

Strength of spin-isospin transitions in A = 28 nuclei

“…We approximate ϕ µ , as is done usually for light and medium nuclei, by the average value calculated in [8].…”

Production of Tauonic Uranium in e+ -e- Machines

“…Instead, the Dirac equation must be solved exactly numerically. Reference [5] gives the uranium protonic charge density for a radial distribution. Using this density, the energy levels are presented in Table 2, while I give in Fig.…”

“…159 which should be compared to a value rH = 8 x 10 9 s _1 for hydrogen 5 . This weak capture in uranium will be accompanied by prompt fission, which is an unmistakable signature.…”