ICHEP 2022

Non-identical particle femtoscopy in Pb-Pb collisions at 5.02 TeV with ALICE

8 Jul 2022, 18:10

15m

Room 3 (Verde)

Parallel Talk Heavy Ions Heavy Ions

Speaker

Pritam Chakraborty

Description

Femtoscopy is a tool that can be used to measure the space-time dimensions of the particle-emitting source created in heavy-ion collisions using two-particle correlations. Additionally to the measurement of the system size, one can extract the average pair-emission asymmetry between two particles with different masses. In this context, the measurement of femtoscopic correlations between charged pion and kaon pairs for different charge combinations obtained in Pb-Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 TeV with ALICE at the LHC is presented. The spherical harmonics
representations of the correlation functions ($C_0^0$ and $\mathrm{\Re }{C}_1^1$) have been studied in different centrality bins. The obtained correlation functions are analysed after taking into account a precise treatment of the non-femtoscopic background. The extracted source size ($R$) and the pair emission asymmetry ($\mu$) show an increase from peripheral to central events. Moreover, it is observed that pions are emitted closer to the centre of the particle-emitting system than kaons and this result is associated to the hydrodynamic evolution of the source. Also, the source radii are found to be decreasing with increasing average momentum ($k_{\mathrm{T}}$) and transverse mass ($m_{\mathrm{T}}$) of the pair which indicates the presence of strong radial flow in the system.

Presentation materials

Pritam_ICHEP2022_08072022.pdf