A study of cc(c)over-bar(c)over-bar tetraquark decays in 4 muons and in D(*) (D)over-bar(*) at LHC

We perform a quantitative analysis of the decays of cc (c) over bar(c) over bar tetraquarks with J(PC) = 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 similar to 39(780) fb for the 4 muons channel, and similar to 42(616) pb for the D(*) (D) over bar(*) -> e mu channel, in the 0(++)(2(++)) case. Decay widths depend upon the additional parameter xi = vertical bar Psi(T)(0)vertical bar(2)/Psi(J/psi)(0)vertical bar(2), which can be computed with a considerable error. We find Gamma(0(++)) similar to Gamma(2(++)) = 97 +/- 30. On the basis of our results and with the present sensitivity, LHCb should detect both 0(++) and 2(++) fully-charmed tetraquarks. (C) 2020 The Author(s). Published by Elsevier B.V.