Eur. Phys. J. C (2018) 78: 647
https://doi.org/10.1140/epjc/s10052-018-6073-9

Regular Article - Theoretical Physics

Spectroscopy and decays of the fully-heavy tetraquarks

¹ CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China
² University of Chinese Academy of Sciences, Beijing, 100049, China
³ Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany
⁴ School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
⁵ INFN, Sezione di Genova, via Dodecaneso 33, 16146, Genoa, Italy

^* e-mail: naeem@itp.ac.cn

Received: 30 April 2018
Accepted: 13 July 2018
Published online: 13 August 2018

Abstract

We discuss the possible existence of the fully-heavy tetraquarks. We calculate the ground-state energy of the 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 tetraquark mass is predicted to be  GeV. Mass inequality relations among the lowest states, where , and the corresponding heavy quarkonia are presented, which give the upper limit on the mass of ground state . The possible decays of the lowest 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.