ROCKSTAR: Towards a ROadmap of the Crucial measurements of Key observables in Strangeness reactions for neutron sTARs equation of state

Session

Session II

9 Oct 2023, 14:15

Aula Renzo Leonardi (ECT*)

Conveners

Session II

• Fuminori Sakuma (RIKEN Nishina Center of Accelerator-Based Science)

5. Search for the Kbar-NN state in photoproduction with LEPS2 spectrometer

Ryo Kobayakawa (Osaka Univ. (RCNP))

09/10/2023, 14:15

The behavior of kaon and anti-kaon in dense matter is an important topic, as their nature is closely related to symmetry breaking in low-energy QCD.
The interaction of kaons and anti-kaon with nucleon has been extensively studied with various experiments.These studies found that the Kbar-N interaction in the isospin I=0 channel is sufficient to produce the quasi-bound state Λ(1405).
This...

15. Study of mesonic decay of KbarNN using J-PARC E15 data

Takumi Yamaga (RIKEN)

09/10/2023, 14:45

The lightest kaonic nuclear bound state, $\bar{K}NN$, was observed by measuring a non-mesonic decay of $\bar{K}NN \to \Lambda p$ in the J-PARC E15 experiment. The obtained binding energy, $B.E. \sim 40~{\rm MeV}$ is compatible with those of theoretical predictions. On the other hand, the obtained decay width, $\Gamma_{\bar{K}NN} \sim 100~{\rm MeV}$, is rather larger than the predictions. It is...

14. Development of large acceptance spectrometer for systematic study of kaonic nuclei at J-PARC

Takuya Nanamura (Japan Atomic Energy Agency)

09/10/2023, 15:45

Bound states caused by attractive $\bar{K}N (I=0)$ interaction, such as $\Lambda(1405)$ and kaonic nuclei, are interesting systems with strangeness.
Many experimental attempts have tried to establish an existence of the lightest kaonic nuclei, "$K^- pp$". However, no clear conclusion was reached. Recently, J-PARC E15 collaboration searched for "$K^- pp$", using the in-flight $K^-...

16. New calculations of the K-pp system

Nina Shevchenko (Nuclear physics institute, Rez)

09/10/2023, 16:15

E15 collaboration at J-PARK reported a clear signal of a KNN quasi-bound state. The width of the state is much larger than theoretical predictions. A series of calculations of the K-pp quasibound state characteristics with different input was performed in order to check, whether it is possible to reach the experimental values.