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Description
The measurement of momentum correlations of identical pions serves as a fundamental tool for probing the space-time properties of a particle-emitting source created in high-energy collisions. Recent experimental results have shown that in pp collisions, the size of the one-dimensional primordial source depends on the transverse mass (mT) of the hadron pairs, following a common scaling behavior similar to that observed in Pb–Pb collisions. In this study, a systematic analysis of the 𝜋- 𝜋 source and correlation functions was performed using the multiphase transport model (AMPT) to understand the properties of the emitting source created in high-multiplicity pp collisions at √s = 13 TeV. The mT-scaling behavior and pion emission source radii measured by the ALICE experiment can be described well by a model with a subnucleon structure. This work sheds new light on the efective size of the 𝜋-𝜋 emission source and the study of intensity interferometry in small systems using a transport model.
