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## Search for the doubly charmed baryon Ξ cc

Science China Physics, Mechanics & Astronomy. 2020. Vol. 63. No. 2. P. 221062-1-221062-15.

A search for the doubly charmed baryon Ξ cc is performed through its decay to the Λ + c K − π + final state, using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7, 8 and 13 TeV. The data correspond to a total integrated luminosity of 9 fb −1 . No significant signal is observed in the mass range from 3.4 to 3.8 GeV/c 2 . Upper limits are set at 95% credibility level on the ratio of the Ξ cc production cross-section times the branching fraction to that of Λ + c and Ξ cc
baryons. The limits are determined as functions of the Ξ cc mass for different lifetime hypotheses, in the rapidity range from 2.0 to 4.5 and the transverse momentum range from 4 to 15 GeV/c.