Search for the ring-like structures in the emission of secondary particles in central 197Au collisions with emulsion nuclei at 11.6A GeV/c

Angular spectra of the relativistic secondary particles produced in Au+Em nuclear collisions at 11.6A GeV/c are analyzed by the method of continuous wavelet transform in order to search for the ring-like structures which could indicate either the production of Cherenkov gluons or the occurrence of Mach shock waves in excited nuclear matter. The analysis is based on the assumption that the presence of the above-mentioned effects would be manifested by excess of particles at some characteristic pseudorapidities. In addition, the involved particles are expected to be azimuthally uniformly distributed. The irregularities are revealed in the wavelet pseudorapidity spectra in the scale pseudorapidity region up to 0.5. These irregularities are interpreted as the preferred pseudorapidities of groups of emitted particles. The performed study of the azimuthal structure of the above-mentioned pseudorapidity irregularities suggests that they are not related to the sought ring-like structures