Showing papers on "Strangeness published in 1969"

Amelioration of divergence difficulties in the theory of weak interactions

Abstract: 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 intermediate-vector-boson interaction Lagrangian. To illustrate what we have in mind, we note that on account of this singular character, the conventional theories have not yet yielded an understanding of the weakness of strangeness and parity violation in hadronic processes and the weakness of semileptonic neutral decays. We begin with an interaction Lagrangian in which the constituents of the conventional weak current (e.g., strangenesschanging, axial-vector, muonic, etc.) are coupled to possibly distinct local vector operators. This is done in such a way that the effective weak interaction between two currents decomposes into two parts, one having the universality of the weak interaction, the other, called diagonal, acting only between a constituent and itself. It is then possible to transfer the singularity of the weak interaction to the diagonal interaction and to impose any desired degree of symmetry upon the singular part of the diagonal interaction. Two realizations of this approach are presented. Both are intermediate-boson theories involving gradient-coupled spin-0 bosons as well as spin-1 bosons. An important consequence of these theories is that, apart from implying a lower bound, the weak interactions give no indication of the magnitude of the diagonal interactions. Thus while the scattering of μ-neutrinos by electrons should be governed by the conventional universality formula, there is no reason to expect universality to hold for the scattering of e-neutrinos by electrons.

A non-linear realisation ofSU(3)⊗SU(3)

Abstract: A non-linearSU(3)⊗SU(3) invariant Lagrangian is constructed. The non-linear transformations are required to be linear only on the subgroup of isospin rotations and strangeness gauges: π,K, η and scalarκ-mesons appear as goldstone bosons; masses of vector- and axialvector, as well as strange and non-strange, Yang-Mills fields are split. Results predicted by thisSU(3)⊗SU(3) invariant Lagrangian are similar to those obtained previously by Ward-identity techniques, however, no assumption on symmetry-breaking has to be made. TheKl3-formfactors are discussed.

Possible contributions of ΔS=−ΔQ amplitudes to Kℓ30 decay rates

Abstract: General expressions are given for the lifetime distributions of the positive and negative leptons in the π±l-+ν decay modes in a neutralkaon beam of known initial strangeness. For Kμ30 decays the contribution of a possible violation of ΔS=ΔQ in thef− form factor is included. The Ks0, KL0 interference region and the KL0 decays are considered separately. Experimental methods of determining the two complex, Lorentz invariant, ΔS=−ΔQ amplitudes,x+ andx− are discussed.

Properties and interactions of new particles.

Abstract: : The general objective of the research is to study the nature of fundamental particles and their production mechanisms. A counter experiment was completed relating the basic coupling constant of some of these mesons to electro-magnetic forces. In addition a search for new mesons gave a negative result for strangeness plus one baryons, but did produce recently discovered Q and L mesons and a possible new candidate for a negative 1 meson. Various properties of these particles and their production mechanisms were determined.

Do the Z* hyperons, with strangeness + 1, exist ?

Abstract: The answer to the question asked in the title of this talk «do theZ* exist?» remains, at this time: nobody knows, but probably not with formation cross sections as large as shown in Table I.