Wavelet Analysis of Angular Distributions of Secondary Particles in High-Energy Nucleus–Nucleus Interactions: Irregularity of Particle Pseudorapidity Distributions

摘要

Experimental data on interactions of sulfur and oxygen nuclei with photoemulsion nuclei at energies of 200 and 60 GeVucleon are analyzed with the help of a continuous wavelet transform. Irregularities in pseudorapidity distributions of narrow groups of the secondary shower particles in these interactions are observed upon application of the second-order derivative of a Gaussian as a wavelet. The irregularities can be interpreted as the existence of preference emission angles of groups of particles. Such an effect is expected during emission of Cherenkov gluons in nucleus–nucleus collisions. Some of the positions of the observed peculiarities on the pseudorapidity axis coincide with those found by Dremin et al. (I. M. Dremin et al., Phys. Lett. B 499, 97 (2001)).