Journal
PHYSICAL REVIEW LETTERS
Volume 119, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.112001
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- CAPES (Brazil)
- CNPq (Brazil)
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- MOST (China)
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- OSC (USA)
- AvH Foundation (Germany)
- EPLANET (European Union)
- Marie SklodowskaCurie Actions (European Union)
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- RFBR (Russia)
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- GENCAT (Spain)
- Herchel Smith Fund (United Kingdom)
- The Royal Society (United Kingdom)
- Royal Commission for the Exhibition of 1851 (United Kingdom)
- Leverhulme Trust (United Kingdom)
- STFC [ST/G005974/1, ST/K003410/1, ST/J004332/1, LHCb, LHCb Upgrades, 1641747, ST/N000331/1, 1653105, 1796908, ST/H006737/1, 1707993] Funding Source: UKRI
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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.
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