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Title: First Observation of the Doubly Charmed Baryon Decay Ξ++cc→Ξ+cπ+
Authors: Aaij, Roel
Adeva, Bernardo
Adinolfi, Marco
Aidala, Christine
Panshin, Gennady Leonidovich
Strokov, Sergey Aleksandrovich
Vagner, Aleksandr Rudolfovich
Issue Date: 2018
Publisher: Томский политехнический университет
Citation: First Observation of the Doubly Charmed Baryon Decay Ξ++cc→Ξ+cπ+ / R. Aaij [et al.] // Physical Review Letters. — 2018. — Vol. 121, iss. 16. — [162002, 10 p.].
Abstract: The doubly charmed baryon decay Ξ++cc→Ξ+cπ+ is observed for the first time, with a statistical significance of 5.9σ, confirming a recent observation of the baryon in the Λ+cK−π+π+ final state. The data sample used corresponds to an integrated luminosity of 1.7  fb−1, collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV. The Ξ++cc mass is measured to be 3620.6±1.5(stat)±0.4(syst)±0.3(Ξ+c)  MeV/c2 and is consistent with the previous result. The ratio of branching fractions between the decay modes is measured to be[B(Ξ++cc→Ξ+cπ+)×B(Ξ+c→pK−π+)]/[B(Ξ++cc→Λ+cK−π+π+)×B(Λ+c→pK−π+)]=0.035±0.009(stat)±0.003(syst).
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