Summary
B 8-B8scattering is studied making use of the fact that the forces contain the sameBBP Hamiltonian as theP 8-B8problem. This circumstance is exploited to find consistency conditions in low partial waves using experimental data. Results are consistent only if a new particle exists with quantum numbersB=2, T=Y=J=O, andF/D ratio inBBP coupling ≃1/3. It is argued that if this state does not exist the dynamical calculations, based on one-particle exchange and lowestlying threshold dominance, would have to be reconsidered. Besides this, such a particle would have interesting properties, in particular if its mass lies below2mΛ, as could very well be the case: a possibility would then be open to study the weak decays of Σ°.
Riassunto
Si studia lo scatteringB s-Bsfacendo uso del fatto che le forze oontengono lo stesso Hamiltoniano BBPche nel problemaP s-Bs. Si sfrutta questa circostanza per trovare le eondizioni di coneordanza nelle onde parziali deboli facendo uso dei dati sperimentali. I risultati eoncordano solo se esiste una nuova particella con numeri quanticiB=2, T=Y=J=0 ed un rapportoF/D nell’accoppiamento BBP~1/3. Si deduce ehe, se questo stato non esiste, i calcoli dinamici, basati sullo scambio di una particella e sul predominio della soglia più bassa, devono essere esaminati nuovamente. A parte ciò, tale particella dovrebbe avère interessanti proprietà, particolarmente nel caso in cui la sua massa sia inferiore a 2mΛ, come potrebbe verosimilmente essere: si aprirebbe allora una via per studiare i decadimenti deboli del 2°.
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Diu, B., Rubinstein, H.B. Baryon number 2, unitary singlet as a test of one-particle-exchange dynamical models. Nuovo Cim 38, 831–843 (1965). https://doi.org/10.1007/BF02748601
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DOI: https://doi.org/10.1007/BF02748601