Multi-Quark Hadrons in the Quark Model Makoto Oka Advanced Science - PowerPoint PPT Presentation

Multi-Quark Hadrons 
 in the Quark Model Makoto Oka Advanced Science Research Center, JAEA 
 March 2019, YITP Makoto Oka (ASRC, JAEA)

Contents 1. Introduction 2. Dibaryon d*= D Δ = ΔΔ (I=0, J=3) 3. Pentaquark P cs (cc bar uds) 4. Pentaquark P c (cc bar uud) 5. Conclusion Makoto Oka (ASRC, JAEA) 2

Introduction Hadrons are made of quarks bound by gluonic forces. Dynamics of quarks and gluons are highly non-perturbative. Low-lying hadrons are described in terms (only) of valence, or constituent quarks. No hadron with constituent gluon is confirmed. The constituent quark seems to exhibit “non-relativistic” degrees of freedom even for light (chiral) quarks, i.e. , orbital motion, spin, flavor and color. The short-range interactions among the quarks are described by spin-color-flavor dependent two-body forces. The color Coulomb interaction and the color-magnetic interaction are dominant. At long distances, the color confinement is to be realized, but no consensus is reached for how the confinement is described by potentials. The pair production/annihilation of quarks are not under control in the potential model. Makoto Oka (ASRC, JAEA) 3

Color Interactions of Quarks