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Title of Journal: Nuovo Cim

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Abbravation: Il Nuovo Cimento (1955-1965)

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Società Italiana di Fisica

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1827-6121

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The energy dependence of meson multiplicity in the

Authors: S Kaneko M Okazaki
Publish Date: 2008/02/08
Volume: 8, Issue: 4, Pages: 521-532
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Abstract

An attempt has been made to analyse some experimental data of highenergy showers so far reported It is shown that the dependence of the meson multiplicity on the primary energy seems to be explained phenomenologically at least within the present limitation of experimental accuracy in terms of the single nucleonnucleon collision by making allowance for the fluctuation in inelasticity The result seems to be consistent with the assumption that the average energy of produced mesons in the centerofmass system is fairly constant about 200 MeV kinetic energy independently of the primary energy at least up to about 100 GeV in the laboratory system so that the meson multiplicity normalized at the value 1 of inelasticity increases rather sharply with the primary energy At higher energies the collimation of highenergy mesons into the forward and backward cones would result in increasing the average meson energy so that the increase of the normalized multiplicity with the primary energy seems to become slower than at lower energies The results of the analysis are discussed in comparison with the existing theories of multiple meson productionSi analizzano alouni dati sperimentali su sciami di alta energia finora resi noti Si dimostra che tenuto conto delle fluttuazioni dell’anelasticità appare possibile spiegare fenomenologicamente la dipendenza della molteplicità mesonica dall’energia primaria almeno nei limiti dell’esattezza attuale della sperimentazione in termini della singola collisione nuoleonenucleone Il risultato sembra accordarsi oon l’ipotesi che l’energia media dei mesoni prodotti è abbastanza costante energia cinetica circa 200 MeV indipendentemente dall’energia primaria almeno fino a circa 100 GeV nel sistema del laboratorio cosicchè la molteplicità mesonica normalizzata al valore 1 dell’anelasticità cresce piuttosto bruscamente con l’energia primaria Ad energie superiori la collimazione dei mesoni di alta energia nei coni anteriore e posteriore risulterebbe nell’accrescere l’energia mesonica media cosicchè l’aumento della molteplicità normalizzata con l’energia primaria sembra esser più lento che alle basse energie Si confrontano i risultati dell’analisi con quelli delle attuali teorie della produzione multipla dei mesoni

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