Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.062004
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- CERN
- CAPES (Brazil)
- CNPq (Brazil)
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- CNRS/IN2P3 (France)
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- Direct For Mathematical & Physical Scien
- Division Of Physics [1205805] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1505719] Funding Source: National Science Foundation
- Science and Technology Facilities Council [ST/L003112/1, 1225314, ST/K001302/1, 1415632, 1299204, ST/K001256/1, ST/L001195/1, ST/M001407/1, LHCb Upgrades, 1511824, ST/M000729/1, ST/L003163/1, 1096173, ST/M001474/1, ST/L003538/1, ST/N000250/1, 1416165, ST/K001310/1 ATLAS, ST/K00137X/1, ST/K001418/1, ST/K001604/1, ST/K000705/1, ST/L003163/1 LHCb Upgrades, ST/H006737/1, ST/K001310/1 LHCb Upgrades, 1369397, 1364044, ST/K003410/1, ST/H00100X/2, 1225304, ST/K001310/1, ST/J004332/1, GRIDPP, ST/L003392/1, ST/K001310/1 ATLAS Upgrades, 1208164, LHCb, 1564711, PP/E000355/1, ST/H00100X/1, ST/K001310/1 LHCb, ST/K00140X/1, ST/J50094X/1] Funding Source: researchfish
- STFC [ST/H00100X/2, ST/H00100X/1, ST/L003392/1, PP/E000355/1, ST/L001195/1, ST/H006737/1, ST/M000729/1, ST/K000705/1, ST/M001407/1, ST/L003538/1, ST/K00140X/1, ST/J50094X/1, ST/K001302/1, ST/L003112/1, LHCb Upgrades, ST/L003163/1, LHCb, ST/J004332/1, ST/K003410/1, ST/K00137X/1, ST/K001604/1] Funding Source: UKRI
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Two structures are observed close to the kinematic threshold in the Xi(0)(b)pi(-) mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), recorded by the LEICb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity J(P) = (1/2)(+) and J(P) = (3/2)(+) states, denoted Xi'(-)(b) and Xi*(-)(b). Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to be m(Xi'(-)(b)) - m(Xi(0)(b)) - m(pi(-))=3.653 +/- 0.018 +/- 0.006 MeV/c(2), m(Xi*(-)(b)) - m(Xi(0)(b)) - m(pi(-)) = 23.96 +/- 0.12 +/- 0.06 MeV/e(2), Gamma(Xi*(-)(b)) = 1.65 +/- 0.31 +/- 0.10 MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Gamma(Xi'(-)(b)) < 0.08 MeV at 95% confidence level. Relative production rates of these states are also reported.
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