Publications associated with TORCH


Observation of the doubly charmed baryon Ξcc++.

Physical Review Letters American Physical Society 119 (2017) 112001-

B Adeva, R Aaij, M Adinolfi, M Bjoern, T Evans, P Gandini, BR Gruberg Cazon, T Hadavizadeh, TH Hancock, N Harnew, DR Hill, PG Jalocha, MJJ John, NP Jurik, S Malde, AK Nandi, HL Pullen, S Topp-Joergensen, A Rollings, G Veneziano, M Vesterinen, GR Wilkinson

A highly significant structure is observed in the Λ+cK−π+π+ mass spectrum, where the Λ+c baryon is reconstructed in the decay mode pK−π+. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Ξ++cc. The difference between the masses of the Ξ++cc and Λ+c states is measured to be 1334.94±0.72(stat.)±0.27(syst.)  MeV/c^2, and the Ξ++cc mass is then determined to be 3621.40±0.72(stat.)±0.27(syst.)±0.14(Λ+c)  MeV/c^2, where the last uncertainty is due to the limited knowledge of the Λ+c mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7  fb^−1, and confirmed in an additional sample of data collected at 8 TeV.


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