Some interesting features of charged particles produced in high-energy hadron–emulsion collisions

Abstract

The emission characteristics of secondary charged particles produced in 400 GeV proton-emulsion interactions were compared with those obtained at other energies. The results revealed that the angular distribution of grey particles does not depend on the nature and energy of the projectile. The dependence of the average multiplicity of the grey, black, shower, and heavily ionizing tracks on the mass of the target nucleus (A) and the nature and energy of the projectiles are also examined. The ratio of the valance quarks in pions ( n -) and protons (p) was found to be almost equal to the ratio of the grey particles produced in .rr--A and p-A collisions at the same energy. The values of the normalized moments of the multiplicity distributions of charged shower particles in different N,, intervals were found to be nearly the same. However, this value increased with increasing values of the moment index, K. Finally, the values of the normalized and central moments were almost equal for both p-p and p-A interactions.Les caractCristiques de I'emission de particules secondaires chargtes dans les interactions de protons de 400 GeV dans des Cmulsions sont comparCes avec celles qu'on a observCes i d'autres Cnergies. Les rCsultats rCvklent que la distribution angulaire des particules grises ne dipend pas de la nature et de 1'Cnergie du projectile. On examine aussi l'influence de la masse du noyau cible (A), ainsi que de la nature et de 1'Cnergie des projectiles, sur la multiplicitC moyenne des particules grises ou noires, des cascades et des traces de forte ionisation. On observe que le rapport des quarks de valence dans les pions (a-) et les protons (p) est presque Cgal au rapport des particules grises produites dans les collisions n--A et p-A B la m&me Cnergie. On trouve que les valeurs des moments normalisCs des distributions de multiplicitt dans les cascades de particules chargCes sont presque les mCmes dans differents intervalles N,. La valeur augmente cependant avec la valeur de l'indice K du moment. Enfin, les valeurs des moments normalisCs et des moments centraux sont presque les mCmes pour les interactions p-p et les interactions p-A.[Traduit par la revue]Can. I. Phys. 68, 67 (1990)

The characteristics of Secondary Charged Particles produced in 4.5 A GeV/c 28 Si-Nucleus Interactions.

“…It is interesting to note that the values of C K in 4.5 A GeV/c 12 C-nucleus reactions and 28 Si-nucleus collisions are almost consistent with constant with the statistical limits. It may be further noted in the Table-1 that, the value of this parameter is observed to increase with increasing value of k. On comparing the findings of the present work with those obtained in 50 GeV and 400 GeV hadron-nucleus collisions [4], it may be observed that the value of C K are very similar in both type of interactions. The k th root of the central moment, µ K of the multiplicity distribution is also studied in 4.5 A GeV/c 28 Si-nucleus collisions.…”

“…The normalized moments of the multiplicity distributions of relativistic charged particles produced in high energy hadron-nucleus collisions has been investigated by several workers in the energy range ~ (50-400) GeV [4]. However, a little attention has been paid to study the normalized moments of the multiplicity distributions of relativistic charged particles produced in nucleus-nucleus interactions [3,6].…”