The femtoscopy analysis allows extracting radii that describe the regions of homogeneity of particles emitting sources in a heavy-ion collision, i.e. the fireball at kinetic freeze-out; a state successor to the chemical freeze-out. The dependence of transverse mass of these radii is sensitive to a variety of properties of the produced matter, like order of the phase transition from Quark-Gluon Plasma (QGP) to hadrons, existence of pre-flow stage, viscosity of QGP, time scales of the evolution, and temperature. The femtoscopic analysis for baryons would enable testing the possible decrease of apparent source size with transverse mass of the particle at masses much higher than the lightest Goldstone bosons. The standard way of carrying out this analysis is to investigate pairs of identically charged particles. The baryon yields reported recently at LHC energies are below expectations from thermal models. Annihilation in final-state rescattering has been proposed as an explanation. Such processes should also be reflected in baryon-antibaryon correlations, which are studied in this work. Furthermore, the correlation functions between produced opposite charges are conjectured as signature differentiating between early and late-stages of hadronization. They are able to describe the temporal evolution of partonic fireball and determine time span since deconfinement phase transition. They are proposed to investigate the hadronization from the producing jets in pp collisions and can be defined in terms of different quantities such as the azimuthal angle $phi$ the rapidity difference $delta y$ the pseudo rapidity difference $delta eta$ and the invariant momentum $q_{inv}$. |
