Constraining the pΛ interaction from a combined analysis of scattering data and correlation functions

Abstract

This work provides the first combined analysis of low-energy pΛ scattering, considering both cross section and correlation data. The obtained results establish the most stringent constraints to date on the two-body pΛ interaction, pointing to a weaker attraction than so far accepted. The best set of scattering lengths for the spin singlet and triplet are found to range from f0,f1=(2.1,1.56) to (3.34,1.18) fm. With a chiral NY potential fine-tuned to those scattering parameters, the in-medium properties of the Λ are explored and a potential depth of UΛ=−36.3±1.3(stat)−6.2+2.5(syst) MeV is found at nuclear matter saturation density.

Keywords

• Scattering
• Femtoscopy
• Chiral effective field theory