# SPIN 2018

9-14 September 2018
University of Ferrara
Europe/Rome timezone
23RD INTERNATIONAL SPIN SYMPOSIUM

## Femtoscopic correlations of two identical particles with nonzero spin in the model of one-particle multipole sources

Not scheduled
40m
University of Ferrara

#### University of Ferrara

Poster Spin Physics in Nuclear Reactions and Nuclei

### Speaker

Dr Valery Lyuboshitz (Joint Institute for Nuclear Research ( Dubna ))

### Description

The process of emission of two identical particles with nonzero spin $S$ and different helicities in relativistic heavy-ion collisions is theoretically investigated within the model of one-particle multipole sources. Taking into account the unitarity of the finite rotation matrix and the symmetry relations for $d$-functions, the general expression for the probability of emission of two identical particles by two multipole sources with angular momentum $J$, averaged over the angular momentum projections and over the space-time dimensions of the multiple particle generation region, has been obtained. For the case of unpolarized particles, the additional averaging over helicities is performed and the formula for two-particle correlation function at sufficiently large 4-momentum difference $q$ is derived. For particles with nonzero mass, this formula is considerably simplified in the case when the angle $\beta$ between the particle momenta equals zero, and also in the case when $J = S$. In addition, the special cases of emission of two unpolarized photons by dipole and quadrupole sources, and emission of two "left" neutrinos ( "right" antineutrinos ) by sources with arbitrary $J$ have also been considered, and the respective explicit expressions for the correlation function are obtained .

### Primary author

Dr Valery Lyuboshitz (Joint Institute for Nuclear Research ( Dubna ))