A. P. Balachandran

Low-energy K+-nucleon scattering

SummaryUsing the phase shifts given byRodberg andThaler, an analysis of low energyS-wave K+-nucleon scattering is carried out under the assumption that the scattering amplitude is dominated by the Σ and Λ poles and the recently observed Λπ, Σπ and ππ resonances.RiassuntoFacendo l’ipotesi che l’ampiezza di scattering sia dominata dai poli Σ e Λ e dalle risonanze Λππ, Σπ e ππ, osservate recentemente, si è eseguita una analisi dello scattering K+-nucleone in ondaS di bassa energia, servendosi degli spostamenti di fase dati daRodberg eThaler.

On the Y*-resonances

SummaryOn the assumption that the recently observed A-π and Σ-π resonances are in theS-wave,J=1/2 state, effective range formulae are derived for the Λ-π and Σ-π scattering amplitudes in this state using a static approximation.RiassuntoIn base all’ipotesi che le risonanze Λ-π e Σ-π, osservate di recente, siano nello statoJ = 1/2 dell’ondaS, si deducono, facendo uso di un’approssimazione statica, le formule del range effettivo per le ampiezze di scattering Λ-π e Σ-π in questo stato.

On the value of the axial vector renormalization in β-decay

SummaryA model is presented in which the axial vector renormalization-GA/G in β-deeay is calculable to all orders in the strong coupling constant provided that the strong interaction Lagrangian is γ5-invariant. It turns out that -GA/G = - 1 which would imply that the unrenormalized β-decay interaction isV + A.RiassuntoSi presenta un modello in oui la rinormalizzazione -GA/G del vettore assiale nel deeadimento β è calcolabile a tutte le approssimazioni della costante dell’accoppiamento forte, purchè il lagrangiano dell’interazione forte, sia invariante rispetto a γ5. Risulta che-GA/G = - 1 il che implicherebbe che l’interazione del decadiinento β non rinormalizzato èV + A.

SOME REMARKS ON THE STRUCTURE OF ELEMENTARY PARTICLE INTERACTIONS

6. SummaryThe existence of symmetries which can lead to minimal electromagnetic interactions have been investigated and three specific invariances to obtain this minimal character have been proposed. Applications of these principles to strong and weak interactions are seen to lead to certain suggestive results. A model of strong interactions arising out of these considerations is also discussed.

Some remarks on sakurai’s theory of strong interactions

Remarks are made concerning a theory on strong interactions (NSA 14: 26207). In general, reactions in which the final state is different from the initial state are not allowed. Consequences of the bilinearity of the Lagrangian are discussed. It is assumed that all the fields are elementary. The theory also does not explain why there is no bound system of an n-bar and a SIGMA /sup +/. (L.N.N.)

Some tests for compound models of elementary particles

Experiemntal means are suggested for testing the validity of some compound models of elementary particles. Asymmetry parameters of decay prcducts of hyperons are predictable from decay characteristics of the constituent particles. The effective range theory offers a second ape binding energy of a compound particle and the scattering lengths, effective ranges, and S-wave phase shifts of the constituent particles. A third method involves requiring that charge se it is possible to derive selection rules for K/sup +/, K-bar/sup 0/, K/ sup -/, K/sup 0/, K sK/sup -/, or K/sup 0/K-bar/sup 0/ annihilation into pions. These selection rules may be used in testing some compount models. Examples ofof given, and it is remarked that simular arguments may be used for baryons. (T.F.H.)