Summary
On the assumption that the violation of unitary symmetry transforms like theI=0,Y=0 member of a unitary octet the coupling constants corresponding to the four observed decay modes \(\mathcal{N}*^ - \)→nπ−, Y*−→Λπ−, Y*1 −→Σπ and Ξ*−→Ξπ of theJ P=3/2+ baryon decuplet may be expressed in terms of three parameters. The ratio between two of the parameters has been estimated from the observed mass splittings by a simple ansatz. We predictΓ(Y*1 −→Λπ)=46 MeV andΓ(Y*1 −→Σπ)= =0.002 MeV in good agreement with experimental data.
Riassunto
Nell’ipotesi che la violazione della simmetria unitaria si trasformi come il membroI=0,Y=0 di un ottetto unitario, si possono esprimere in funzione di tre parametri le costanti d’accoppiamento corrispondenti ai quattro modi di decadimento \(\mathcal{N}*^ - \)→nπ−, Y−*→Λπ−, Y*1 −→Σπ e Ξ*−→Ξπ del decupletto barionicoJ P = 3/2+. Si è valutato con una semplice posizione il rapporto fra due dei parametri in base ai frazionamenti di masse osservati. Si prediceΓ(Y*1 −→Λπ)⋍46 MeV eΓ(Y*1 −→Σπ)⋍0.002 MeV in buon accordo con i dati sperimentali.
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Ghose, P., Sen, S. A note on brokenSU 3 symmetry. Nuovo Cimento A (1965-1970) 43, 752–756 (1966). https://doi.org/10.1007/BF02756697
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DOI: https://doi.org/10.1007/BF02756697