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Analysis of properties of secondary particles in nucleon-nucleon collisions at very high energy

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Il Nuovo Cimento (1955-1965)

Summary

Momentum measurements were made on the individual secondary particles emitted in the « outer » cone of theS-star. A lower limit to the momentum of the particles in the « inner » cone was obtained. The transformation from the laboratory system to the center-of-mass system can be made, using suitable approximations, on the assumption that all charged secondaries are pions. This leads to a symmetrical angular and energy distribution with all particles included in a forward or backward cone of half-angle 20°. The results are compared with various multiple production theories. It is possible to infer that there is no more than one pair of particles of protonic mass among the secondaries and that even the presence of one pair would violate symmetry. The number of K-mesons must also be small. The methods of analysis should be useful on other events in this energy range.

Riassunto

Si sono eseguite misure di quantità di moto sulle singole particelle secondarie emesse nel cono « esterno » della stellaS. Si è ottenuto un limite inferiore per l’impulso delle particelle nel cono « interno ». La trasformazione dal sistema del laboratorio al sistema del centro di massa può esser fatta, servendosi di opportune approssimazioni, assumendo che tutti i secondari carichi siano pioni. Ciò porta a una distribuzione angolare simmetrica dell’energia con tutte le particelle contenute in un cono anteriore o posteriore di semiapertura 20°. Si confrontano i risultati con diverse teorie sulla produzione multipla. È possibile dedurre che fra i secondari non si ha più di una coppia di particelle con massa protonica e che anche la presenza di una sola coppia violerebbe la simmetria. Anche il numero di mesoni K deve essere basso. I metodi di analisi impiegati possono risultare utili anche per lo studio di altri eventi in questo intervallo di energia.

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Schein, M., Glasser, R.G. & Haskin, D.M. Analysis of properties of secondary particles in nucleon-nucleon collisions at very high energy. Nuovo Cim 2, 647–657 (1955). https://doi.org/10.1007/BF02826523

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  • DOI: https://doi.org/10.1007/BF02826523

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