Journal Article

Spectroscopy and decays of the fully-heavy tetraquarks

Bing-Song Zou, Feng-Kun, Guo, Santopinto, Elena, Muhammad Naeem Anwar, Ferretti, Jacopo

2018

Overview

We discuss the possible existence of the fully-heavy tetraquarks. We calculate the ground-state energy of the \\[bb {\\bar{b}} {\\bar{b}}\\] bound state, where b stands for the bottom quark, in a nonrelativistic effective field theory framework with one-gluon-exchange (OGE) color Coulomb interaction, and in a relativized diquark model characterized by OGE plus a confining potential. Our analysis advocates the existence of uni-flavor heavy four-quark bound states. The ground state \\[bb{\\bar{b}}{\\bar{b}}\\] tetraquark mass is predicted to be \\[(18.72\\pm 0.02)\\] GeV. Mass inequality relations among the lowest \\[QQ\\bar{Q}\\bar{Q}\\] states, where \\[Q\\in \\{c, b\\}\\], and the corresponding heavy quarkonia are presented, which give the upper limit on the mass of ground state \\[QQ\\bar{Q}\\bar{Q}\\]. The possible decays of the lowest \\[bb\\bar{b}\\bar{b}\\] are highlighted, which might provide useful references in the search for them in ongoing LHC experiments, and its width is estimated to be a few tens of MeV.

• Publisher: Springer Nature B.V
• Subject: Confining / Field theory / Ground state / Quarks