Heavy tetraquarks production at the LHC

In the current work, spectroscopy and the possibility of observation at the LHC of tetraquarks composed of four heavy quarks are discussed. The tetraquarks concerned are T4c=[cc][c̄c̄], T4b=[bb][b̄b̄], and T2[bc]=[bc][b̄c]̄. By solving the nonrelativistic Schr\"odinger equation, masses of these states are found with the hyperfine splitting that is accounted for. It is shown that masses of tensor tetraquarks T4c(2⁺⁺) and T2[bc](2⁺⁺) are high enough to observe these states as peaks in the invariant mass distributions of heavy quarkonia pairs in pp→T4c+X→2J/ψ+X, pp→T2[bc]+X→2Bc+X and pp→T2[bc]+X→J/ψΥ(1S)+X channels, while T4b is under the threshold of decay into a vector bottomonia pair.