Excited doubly heavy baryons production via top-quark decays

Within the framework of NRQCD, we calculate the production of the excited doubly heavy baryons EbQ through the semi-inclusive production process t -> (bQ)[n] -> EbQ + Q over bar + W+, where Q = b or c quark. The intermediate diquark state (bQ)[n] is in the excited P-wave state, including [1P1] and [3PJ] (J = 0, 1, or 2) in both color anitriplet state 3 over bar and color sixtuplet state 6; that is, (bc)[1P1]3 over bar /6, (bc)[3PJ]3 over bar /6, (bb)[1P1]3 over bar , and (bb)[3PJ]6. We find that the contributions from the P-wave states are about one order lower than the S-wave contributions, and this conclusion is consistent with others. We also analyze the invariant mass and angle differential distributions, and the theoretical uncertainty from the mass parameters, the transition probability, and the renormalization scale. Finally, we can expect that about 1.14 x 103-5 events of excited Ebc and 2.47 x 101-3 events of excited Ebb can be produced per year at the LHC with L = 1034-36 cm-2s-1.