Nucleus-Nucleus Collisions at Low Energies. The Effects from Non Vacuum Exchange

TL;DR

This paper analyzes low-energy nucleus-nucleus collisions, using experimental elastic scattering data to model non-vacuum contributions, which could influence baryon distribution and chemical potential in the collision's central region, relevant for FAIR and NICA.

Contribution

It introduces a model incorporating non-vacuum reggeons to explain baryon transfer in low-energy collisions, highlighting potential effects on chemical potential in the central region.

Findings

Non vacuum contributions shift baryon number to the central rapidity region.

Model parameters fitted to experimental elastic scattering data.

Implications for increased chemical potential at low energies.

Abstract

Experimental data on total and differential elastic cross sections for $p+p(\bar{p})$, $n+p(\bar{p})$, $K^\pm+p$, $K^\pm+n$, $\pi^\pm+p$ starting from energy 3.5 GeV in CMS are used to determine parameters of vacuum contribution and parameters of basic non vacuum reggeons: $f$, $\omega$, $\rho$ and $A_2$. It is argued that non vacuum contributions to proton-proton and proton-neutron collisions correspond to spectrum in which baryon number is moved from the fragmentation region to central region in rapidity space. In this case it is possible that chemical potential is increased in central region of spectrum of nucleus-nucleus interaction at low energies. This effect might be important for facilities FAIR and NICA.