%0 Journal Article
%T Observation of the Doubly Charmed Baryon Xi(++)(cc)
%A LHCb Collaboration (Aaij, R. et al
%A Garcia Martin, L. M.
%A Henry, L.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Valls, P.
%A Ruiz Vidal, J.
%A Sanchez Mayordomo, C.
%J Physical Review Letters
%D 2017
%V 119
%N 11
%I Amer Physical Soc
%@ 0031-9007
%G English
%F LHCbCollaborationAaij_etal2017
%O WOS:000410190800002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3290), last updated on Tue, 26 Sep 2017 15:09:54 +0000
%X A highly significant structure is observed in the Lambda K-+(c)-pi(+)pi(+) mass spectrum, where the Lambda(+)(c) baryon is reconstructed in the decay mode pK(-)pi(+). The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Xi(++)(cc). The difference between the masses of the Xi(++)(cc) and Lambda(+)(c) states is measured to be 1334.94 +/- 0.72(stat.) +/- 0.27(syst.) MeV/c(2), and the Xi(++)(cc) mass is then determined to be 3621.40 +/- 0.72(stat.) +/- 0.27(syst.) +/- 0.14(Lambda(+)(c)) MeV/c(2), where the last uncertainty is due to the limited knowledge of the Lambda(+)(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.
%R 10.1103/PhysRevLett.119.112001
%U http://arxiv.org/abs/1707.01621
%U https://doi.org/10.1103/PhysRevLett.119.112001
%P 112001 - 10pp