Speakers
Description
Quantum chromodynamics (QCD), the fundamental theory of strong interactions, allows the existence of exotic hadrons other than mesons and baryons. An exotic hadron consisting of six quarks is called a dibaryon, and a dibaryon containing strange quarks (multi-strangedibaryon) has not yet been discovered. An exotic hadron consisting of four quarks and an antiquark is called a pentaquark, and the recent discovery of the hidden charm pentaquarks P$_{c}(4312)^{+}$ , P$_{c}(4440)^{+}$, and P$_{c}(4457)^{+}$ by LHCb has reopened the question of whether pentaquarks exist in the strange sector.
The recent lattice QCD calculations by HAL QCD showed the attractive potentials between $\Lambda\Lambda$, N${\Xi}$, and N${\Omega}$. The strangeness enhancement, measured by ALICE as a function of increasing charged particle multiplicity even in pp collisions, further adds to the likelihood of observing strange pentaquark and dibaryon states. A consequence of these attractive potentials and strangeness enhancement is that the H-dibaryon can be a resonance state of $\Lambda\Lambda$, or N${\Xi}$, and N${\Omega}$ may appear as a quasi-bound state, strongly decaying at the collision point. Also, following analogous decay channels for the five quark P$_{c}^{+}$ states into the strange sector, a P$_{s}$ decaying strongly with daughters $\phi$p, $\Lambda K$, $\Lambda K^*$, and $\Sigma^{∗}K$ may appear as a bound state.
In this poster, current status of the searches for H-dibaryon, N$\Omega$-dibaryon, and hidden strangeness pentaquark states via invariant mass reconstruction with Run 2 data will be reported. Moreover, perspectives for LHC Run 3 will also be shown.
