Abstract
The shape of the baryon-(anti)baryon femtoscopic correlation function is influenced by the size of the emission source, strong and Coulomb interactions and Quantum Statistics. Another factor introducing additional correlation structures is related to the residual correlations, which are related to the fact that baryons may come from decays of heavier particles. The correlation function of a given pair of baryons (for example pp) is closely connected with correlation functions of other particles (such as pΛ). Analysing correlation functions of multiple baryon pairs simultaneously can further constrain measured strong scattering parameters. A newly developed fitting procedure allowing for a combined fit of several correlation functions is presented. The procedure was applied to 2.76 TeV and 5.02 TeV Pb-Pb data measured by ALICE. The analysis was performed for all combinations of (anti)protons and (anti)lambdas for different collision centralities. Measured strong interaction parameters for pΛ, ΛΛ and heavier baryon-antibaryon (bb) pairs are shown and possible underlying physical processes are discussed.
Highlights
IntroductionThe strong interaction for (anti)baryons (particles composed of three quarks) is not well know
The strong interaction forbaryons is not well know
Thanks to the similar amount of matter and antimatter being produced in heavy-ion collisions at the LHC and the great capability of the detector to measure particle momenta and to perform precise identification, ALICE is a perfect experiment for the study of interactions between baryons and antibaryons
Summary
The strong interaction for (anti)baryons (particles composed of three quarks) is not well know. Heavy-ion collisions at relativistic energies allow for a study of interactions between (anti)baryons by looking at the collisions products, rather than at the particles scattered from the incoming beams. Experiments such as ALICE at the LHC detect nearly the same number of baryons and antibaryons at midrapidity, they are well suited for the study of the strong interaction. What motivate the research presented in this work are several unanswered questions concerning the interaction between baryons and antibaryons, such as "is the strong potential attractive or repulsive for bbpairs?", "do pairs of non-identical baryons annihilate?" or "do bound states of baryonantibaryon exist?". It will be shown that the recent measurements of ALICE and analysis method based on the femtoscopic correlations may help to find answers to these questions
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