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HK: Fachverband Physik der Hadronen und Kerne

HK 71: Hadron Structure and Spectroscopy X

HK 71.4: Talk

Thursday, March 14, 2024, 16:30–16:45, HBR 62: EG 19

p-d femtoscopy and p-p source size measurement in PbPb collisions with ALICE at the LHC — •Dongfang Wang for the ALICE Germany collaboration — Fudan university, Shanghai, China

The ALICE Collaboration recently published a measurement of p-d correlation function in pp collisions at 13TeV. In order to describe the data a three-body analysis was needed. The small source size (of 1 fm) makes the measurement sensitive to the interaction of the proton with the compositions of the deuteron. However we do not know the sensitivity in Pb-Pb which has about 5-10 fm of the typical distances depending on the centralities. In general, these studies depend on a precise measurement of the effective particle emitting source. In small systems extensive studies performed by ALICE showed that the source exhibits an m_T-scaling behavior. Currently, relevant for proton-deuteron studies measurements of proton mt scaling are absent in Pb-Pb 5.02TeV. In this contribution, we extend proton-deuteron study from pp to Pb-Pb collisions and the p-p correlation function analysis differentially in m_T and centrality has to be performed. The obtained correlation functions are fitted and the source size is extracted. Next the detailed information about the source dependence on mT are used as an input to state-of-the-art of source prediction of correlation function. This control of source is necessary for investigation of the sensitivity of 3-body effects present in the p-d correlation function in Pb-Pb.

Keywords: Femtoscopy; mT-scaling; source size; p-d study; Pb-Pb@5.02TeV