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The experimentally established sign of the π 0 → 2 γ matrix element is used to discriminate between various models of elementary particles and of the decay mechanism. The quark model seems to be excluded.
Measurements of the differential production cross sections of pions, kaons, protons, and antiprotons from 12.3-BeV/ c protons incident upon copper and beryllium targets were made at the Zero-Gradient Synchrotron at Argonne National Laboratory. These measurements were taken at production angles...
It is noted that CPT invariance can be tested by comparing the charge asymmetry in K 2 0 → π ± l ∓ ν with certain terms in the time distribution of the decay K 0 → π l ν . It is pointed out that, under reasonable assumptions, the charge asymmetries for the electronic and muonic decay...
In the ρ bootstrap, the generalized potential is usually computed by assuming that the ρ resonance is the main feature of the scattering amplitude in the crossed channels, making the narrow-width approximation, and using crossing symmetry to obtain the generalized potential in the direct...
An estimate is made for the contribution of the decuplet poles to the weak decays of hyperons using the Rarita-Schwinger formalism for spin- 3 2 fields. SU ( 3 ) symmetry is used in conjunction with the Gourdin-Salin model for the D - B - π and D - B - γ couplings. It is shown that the decuplet...
A new approach to the problem of the singularity of the weak interactions is presented. Its aim is to provide a theoretical interpretation of the extreme smallness of the violation of selection rules associated with the weak-vector-current operator appearing in the conventional Fermi or...
Among a sample of 1222 mesonically decaying hypernuclei of range greater than 20 μ, we have observed three cases of π + decay of He 4 Λ . We estimated the total number of π - decays of He 4 Λ to be 184±52. This yields a π + -to- π - branching ratio of (1.6±1.3)%. This value is lower than...
Use of a double-Regge-pole-exchange model to describe peripheral three-body final-state processes, especially at near-threshold values of the invariant mass of a pair of final-state particles, is described and discussed. The fact is stressed that the model provides an understanding of the entire...
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