Spectroscopy and decays of the fully-heavy tetraquarks

By M. N. Anwar, J. Ferretti, F. Guo, E. Santopinto, B. Zou. The European Physical Journal C, 2017

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We discuss the possible existence of the fully-heavy tetraquarks. We calculate the ground-state energy of the $$bb {\bar{b}} {\bar{b}}$$bbb¯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 $$bb{\bar{b}}{\bar{b}}$$bbb¯b¯ tetraquark mass is predicted to be $$(18.72\pm 0.02)$$(18.72±0.02) GeV. Mass inequality relations among the lowest $$QQ\bar{Q}\bar{Q}$$QQQ¯Q¯ states, where $$Q\in \{c, b\}$$Q∈{c,b}, and the corresponding heavy quarkonia are presented, which give the upper limit on the mass of ground state $$QQ\bar{Q}\bar{Q}$$QQQ¯Q¯. The possible decays of the lowest $$bb\bar{b}\bar{b}$$bbb¯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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/eac6275eb21f4df57b9838bedd92e6dd056d53e1

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