FEMTOSCOPY OF PION-PROTON SYSTEM AT 200 A GeV

摘要

Correlations between non-identical particles at small relative velocity probe asymmetries in the average space-time emission points at freeze-out. Such asymmetries may arise from long-lived resonances, bulk collective effects, or differences in the freeze-out scenario for the different particle species. STAR has extracted pion-proton correlation functions from a high-statistics dataset of Au + Au collisions at (s_(NN))~(1/2) = 200 GeV. We present a femtoscopic analysis (including spherical-harmonics decomposition) of pions and (anti-)protons for collisions of different centrality. Our results suggest that pions and protons have relatively shifted average space-time emission points. At the end we show THERMINATOR simulations which look quantitatively similar to the data.