Abstract
Data from a number of experiments in high-energy physics indicate difficulties in the description of the production of pions and \(\rho^{0}\) -mesons using existing models of hadronic interactions. One of the possibilities for introducing new non-collective effects is to modernize the fragmentation models of relativistic Nambu–Goto strings. As an option, the use of initially extended strings is proposed, which makes it possible to calculate string parameters in configurations that are realistic for hadronic and nucleus–nucleus interactions. For this purpose, a special gauge is introduced, suitable for calculations with arbitrary initial conditions. The ability to determine the spin–orbital characteristics of strings allows us to impose additional restrictions on the mass of string fragments.
