Observation of the Doubly Charmed Baryon Ξcc++

Weak decays of doubly heavy baryons: the $$1/2\rightarrow 1/2$$ 1 / 2 → 1 / 2 case

“…However, this evidence has not been confirmed by any other experiments [5][6][7][8]. Very recently, the LHCb collaboration has observed the doubly charmed baryon ++ cc with mass given as [9] m ++ cc = (3621.40 ± 0.72 ± 0.27 ± 0.14) MeV.…”

“…• Very recently, LHCb has observed ++ cc in the final state of + c K − π + π + with the significance of more than 12σ [9]. The multi-body charmed hadron decays are usually dominated by the resonant contributions, since there are many resonances below the charm scale.…”

“…4 and 5, we apply our results to calculate the partial widths for semileptonic B → B ν decays, and the nonleptonic decays, respec- Table 2 Masses (in units of GeV) and lifetimes (in units of fs) of doubly heavy baryons. We have used the experimental data for the mass of ++ cc [9] and theoretical results from Refs. [21,46,58,61,62] Baryons…”

“…Masses 3.621 [9] 3.621 [9] 3.738 [58] 6.943 [58] 6.943 [58] 6.998 [58] 10.143 [58] 10.143 [58] 10.273 [58] Lifetimes 300 [21] 100 [21] 270 [61,62] 244 [46] 93 [46] 220 [61,62] 370 [46] 370 [46] 800 [61,62] tively. A brief summary and some discussions on the future improvements are given in the last section.…”

Doubly charmed baryon production in heavy ion collisions

“…Recently the LHCb Collaboration reported the observation of a doubly charmed baryon carrying two units of positive charge, Ξ þþ cc , with a mass mðΞ cc Þ ≈ 3621 MeV [1]. Though it is still unclear why the observed mass differs from the previous SELEX result [2], the existence of such doubly charmed baryons is now on a more solid ground.…”