Summary
In order to describe the low-energy K−-p, K 02 -p and K−-d interactions, six new sets of energy-dependents-wave\(\bar K\)-nucleon interaction parameters solutions, called solutionsX1,X2,Y1,Y2,Z1 andZ2, are constructed as functions of the width of the 1405 MeV Y*0-resonance, by linear interpolations between Ross and Humphrey’s amplitudes at low values of K−-momentum, Watson’s amplitudes at 400 MeV/c and by requiring the Y*0-resonance as ans-wave bound state of\(\bar K\)-nucleon system. It is found that the K−-p and K−-d scattering processes are rather insensitive to the width of Y*0, whereas the Σ-hyperons production cross-sections favor 50 MeV for Y*0 width (solutionZ2). Also, it is observed that the contribution of Y*0-resonance to the at rest K−-d capture rates is within the uncertainties of experimental measurements (< 20%).
Riassunto
Per descrivere le interazioni K−-p, K 02 -p e K−-d di bassa energia, si sono costruiti sei nuovi gruppi di soluzioni dei parametri dell’interazione\(\bar K\)-nucleone in ondas, dipendenti dall’energia, chiamate soluzioniX1,X2,Y1,Y2,Z1,Z2, in funzione dell’ampiezza della risonanza Y*0 di 1405 MeV, con una interpolazione fra le ampiezze di Ross ed Humphrey per bassi valori dell’impulso dei K− e le ampiezze di Watson a 400 MeV/c ed esigendo che la risonanza Y*0 sia uno stato legato in ondas del sistema\(\bar K\)-nucleone. Si trova che i processi di scattering K−-p e K−-d sono poco sensibili all’ampiezza dell’Y*0, mentre la sezione d’urto per la produzione di iperoni Σ favorisce il valore di 50 MeV per l’ampiezza dell’Y*0 (soluzioneZ2). Si osserva anche che il contributo della risonanza Y*0 ai rapporti di cattura K−-d in quiete è compreso entro i limiti di incertezza delle misure sperimentali (< 20%).
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References
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Chand, R. K−-proton, K 02 -proton, K−-deuterium scattering and absorption processes, and 1405 MeV Y*0-resonance. Nuovo Cim 31, 827–857 (1964). https://doi.org/10.1007/BF02733798
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DOI: https://doi.org/10.1007/BF02733798