Please take more care in quoting. What you've quoted does not describe the current work, but rather something they haven't demonstrated yet called "doubly heavy baryons". That sentence was immediately preceded by this one:

Professor Tim Gershon, Professor of Physics at University of Warwick and UK spokesperson for the LHCb experiment, explained what will come next for the LHCb experiment: “After the LHCb experiment is upgraded in the next long shutdown of the LHC (during 2019-20), it will be able to move to the next stage in the search for new particles: namely, doubly heavy baryons.