QCS2026

Session

Session 5

1 May 2026, 09:00

Conveners

Session 5

• Tetsuo Hyodo (Tokyo Metropolitan University)

Session 5

• Tetsuo Hyodo (Tokyo Metropolitan University)

59. Experimental studies on hyperons in nuclei and neutrons stars

Hirokazu Tamura (Tohoku University)

01/05/2026, 09:00

Fifteen years have passed since the “hyperon puzzle” in neutron stars was raised, but it remains unsolved yet. Various experimental efforts have been and will be made to investigate hyperon-nucleon interactions in dense nuclear matter. Ξ hypernuclei as well as Λ hypernuclei have been intensively studied at J-PARC, clarifying an attractive Ξ-N interaction. High-quality Σ-N scattering...

41. Hyperon single-particle potentials in nuclear matter by chiral forces up to N2LO

Asanosuke Jinno (Kyoto University)

01/05/2026, 09:35

The appearance of hyperons in dense neutron-star matter strongly affects the corresponding equation of state. The onset density of hyperons depends on their single-particle potentials. In this talk, I report the single-particle potentials [1] of the $\Lambda$ and $\Sigma$ hyperons, calculated using up-to-date baryon–baryon interactions derived within chiral effective field theory up to...

39. Constraining the $\Lambda\Lambda$ interaction with terrestrial and astronomical data

Yusuke Tanimura (Soongsil University)

01/05/2026, 10:10

Terrestrial double-$\Lambda$ hypernuclear data and astronomical observations of neutron stars provide complementary constraints on the $\Lambda\Lambda$ interaction. In this work, we investigate the $\Lambda\Lambda$ interaction within a Skyrme energy density functional framework. We employ a Skyrme-type $\Lambda\Lambda$ interaction that includes the standard $s$- and $p$-wave terms, as well as...

26. Lattice QCD studies on S-wave kaon-nucleon interactions and $\Theta^+$ pentaquark

Kotaro Murakami (Institute of Science Tokyo)

01/05/2026, 11:00

Interactions between a kaon and nucleon provide an essential input for understanding the partial restoration of chiral symmetry and the properties of pentaquarks. Although kaon-nucleon scattering experiments at low momenta have been performed since the 1960s, our understanding of these interactions remains limited due to the scarcity of experimental data near the threshold, which hampers a...

50. Structure of hadrons toward dense matter

Atsushi Hosaka (RCNP, Osaka University)

01/05/2026, 11:35

We discuss hadron structure at low energies based on effective models. Conventional approach such as the quark model needs some updates in view of recent discoveries of non-conventional hadrons especially in resonance regions. The relevance of the chiral structure of resonances and impact on dense matter will be discussed.

54. Studying proton-nucleus collisions to extract the behavior of the phi meson in nuclear matter

Philipp Gubler (JAEA)

01/05/2026, 12:10

At present, there is no clear consensus regarding how the mass and width of
the phi meson are modified in a dense environment such as nuclear matter,
nor on the strength of its chiral mixing with the axial-vector chiral
partner. Although a number of theoretical studies have addressed these
questions, establishing a direct connection with experimental observables
remains a significant...