Bose-Einstein correlations of two identical particles through their first measurements by CMS at the LHC

We look at the new two-particle correlation function that can provide the space-time information about the source of two charged pions. This function clearly reflects the chaotic and incoherent nature of the particle emission source disturbed by external forces (fields). We argue that such an investiga- tion could probe the size and the temperature of the expanded source where two pions are emitted in thermal environment.