Speaker
Description
Understanding the complexities of hadron-hadron interactions, particularly in the strangeness sector, is crucial for both hadron physics and the study of dense nuclear matter. Traditionally, these interactions have been investigated through direct scattering experiments, which are inherently limited by the available beam and target channels. To overcome these limitations, two pioneering approaches have recently emerged as indispensable tools: femtoscopy and cusp spectroscopy.
Femtoscopy, which is actively driven by experiments such as LHC-ALICE and RHIC-STAR, has become a powerful method for probing hadronic interactions in high-energy heavy-ion collisions. By measuring two-particle correlations at small relative momenta, femtoscopy at ALICE and STAR provides critical insights into previously inaccessible channels, extracting spin-averaged scattering parameters for various hyperon-nucleon ($YN$) and hyperon-hyperon ($YY$) pairs.
Complementary to this, cusp spectroscopy allows for the precise determination of scattering lengths by analyzing threshold structures. For example, the upcoming J-PARC E90 experiment utilizes the $d(K^{-}, \pi^{-})\Lambda p$ reaction to measure the $\Sigma N$ cusp. By leveraging a deuteron target, this experiment can isolate and determine the scattering length for a specific isospin-spin state, $(T,S)=(1/2,1)$.
This presentation will focus on the strong synergy between these two distinct methods. While femtoscopy provides essential spin-averaged scattering parameters, cusp spectroscopy at J-PARC isolates specific spin configurations. By integrating these results, we can achieve a comprehensive decomposition of all possible isospin-spin states in $\Sigma N$ interactions. Furthermore, we will discuss future prospects for extending these interaction studies, including the upcoming femtoscopy programs at the J-PARC-HI project.
