Wavelet analysis of angular distributions of secondary particles in high energy nucleus-nucleus interactions. Irregularity of particle pseudorapidity distributions

TL;DR

This paper uses wavelet analysis to identify irregularities in pseudorapidity distributions of secondary particles in high-energy nucleus-nucleus collisions, suggesting possible Cherenkov gluon emission effects.

Contribution

It applies continuous wavelet transform to experimental data to detect irregularities in particle distributions, linking them to emission angle preferences and Cherenkov gluons.

Findings

Irregularities observed in pseudorapidity distributions.

Positions of irregularities match previous findings.

Irregularities may indicate Cherenkov gluon emission.

Abstract

Experimental data on sulphur and oxygen nuclei interactions with photoemulsion nuclei at the energies of 200 and 60 GeV/nucleon are analyzed with the help of a continuous wavelet transform. Irregularities in pseudorapidity distributions of narrow groups of the secondary shower particles in the mentioned interactions are observed at application of the second order derivative of Gaussian as a wavelet. The irregularities can be interpreted as an existence of the preference emission angles of groups of particles. Such an effect is expected at 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 I.M.Dremin et al. (I.M.Dremin et al. Phys. Lett., 2001, v. B499, p. 97).)