Doubly heavy tetraquarks in a chiral-diquark picture
Yonghee Kim, Makoto Oka, Kei Suzuki
Abstract
Energy spectrum of doubly heavy tetraquarks, ${T}_{QQ}$ ($QQ\overline{q}\overline{q}$ with $Q=c$, $b$ and $q=u,d,s$), is studied in the potential chiral-diquark model. Using the chiral effective theory of diquarks and the quark-diquark-based potential model, the ${T}_{bb}$, ${T}_{cc}$, and ${T}_{cb}$ tetraquarks are described as a three-body system composed of two heavy quarks and an antidiquark. We find several ${T}_{bb}$ bound states, while no ${T}_{cc}$ and ${T}_{cb}$ (deep) bound state is seen. We also study the change of the ${T}_{QQ}$ tetraquark masses under restoration of chiral symmetry.
Topics & Concepts
TetraquarkDiquarkPhysicsParticle physicsQuarkBound stateBar (unit)Chiral symmetryMeteorologyQuantum Chromodynamics and Particle InteractionsParticle physics theoretical and experimental studiesHigh-Energy Particle Collisions Research