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The SU(3) structure of isoscalar, even-signature meson-exchange amplitudes in elastic meson-baryon scattering is explored. The forward amplitudes corresponding to singlet and octet exchange exhibit complicated energy dependences, neither of which can be ascribed to the exchange of a single Regge...
We consider the possibility that nuclear no-neutrino double-beta decay is mediated by a universally coupled heavy Majorana electron neutrino. From the known rates of nuclear double-beta decays we conclude that the mass of this neutrino must be at least 10 4 GeV.
SU(3) and SU(4) are considered as spectrum-generating groups and applied to the decays ρ → e e ¯ , ω → e e ¯ , φ → e e ¯ , and J ( ψ ) → e e ¯ . The results are compared with the experimental data, which leads to predictions of the form of the electromagnetic transition operator...
Recent experiments in nuclear beta decay have indicated a large tensor form factor in the decay B 12 → C 12 + e - + ν ¯ e . Using elementary-particle methods the implications of this result are studied for the μ -capture reaction μ - + C 12 → B 12 + ν μ . Agreement is hard to obtain...
The threshold behavior of the structure function ν W 2 is evaluated for two- and three-body bound states described by the Blankenbecler-Sugar wave functions. In our approach this is completely equivalent to a fully relativistic Bethe-Salpeter treatment. For spin-zero constituents and a two-body...
New closed forms of the inelastic form factors and structure functions W 1 ( ν , Q 2 ) , W 2 ( ν , Q 2 ) as a function of two variables have been obtained in an infinite-multiplet model. The relativistic H atom and a model of the pion are special cases. The nonrelativistic limit in the former...
It is demonstrated, using the static-model crossing matrices, that the π - and ρ -meson Regge trajectories can support each other. Exchange of the π j in the π ρ j + 1 channel (subscripts indicate spin) generates the π j + 2 ; exchange of the ρ j + 1 in the π π j + 2 channel gives the ρ...
Differential cross sections for elastic p - p scattering have been measured at 285, 348, 398, 414, 455, 497, 530, and 572 MeV kinetic energy. The experiment was performed at the CERN synchrocyclotron, using multiwire proportional chambers placed directly in a proton beam. Scattering was observed...
The problem of finiteness and negative sign of the mean square charge radius of the neutron, 〈 r n 2 〉 , is studied in the context of three popular quark-parton models.
Evidence is presented showing that there are nonresonant coherent backgrounds interfering with Δ ( 3 , 3 ) resonance production in both π N elastic scattering and photoproduction. The background in each case is predominantly given by the Born term projected into the resonant channel. Interplay...
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