A study of ccc¯c¯ tetraquark decays in 4 muons and in D(⁎)D¯(⁎) at LHC

We perform a quantitative analysis of the decays of c c c ¯ c ¯ tetraquarks with J P C = 0 + + , 2 + + into 4 muons and into hidden- and open-charm mesons and estimate, for the first time, the fully charmed tetraquark decay width. The calculated cross section upper limit is ∼ 39 ( 780 ) fb for the 4 muons channel, and ∼ 42 ( 616 ) pb for the D ( ⁎ ) D ¯ ( ⁎ ) → e μ channel, in the 0 + + ( 2 + + ) case. Decay widths depend upon the additional parameter ξ = | Ψ T ( 0 ) | 2 / | Ψ J / ψ ( 0 ) | 2 , which can be computed with a considerable error. We find Γ ( 0 + + ) ∼ Γ ( 2 + + ) = 97 ± 30 . On the basis of our results and with the present sensitivity, LHCb should detect both 0 + + and 2 + + fully-charmed tetraquarks.