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European Organization for Nuclear Research (CERN), Geneva, Switzerland.
Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
Phys Rev Lett. 2017 Aug 11;119(6):062001. doi: 10.1103/PhysRevLett.119.062001. Epub 2017 Aug 8.
The first observation of the decays Λ_{b}^{0}→χ_{c1}pK^{-} and Λ_{b}^{0}→χ_{c2}pK^{-} is reported using a data sample corresponding to an integrated luminosity of 3.0 fb^{-1}, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λ_{b}^{0}→χ_{c1}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.242±0.014±0.013±0.009,B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→J/ψpK^{-})=0.248±0.020±0.014±0.009,B(Λ_{b}^{0}→χ_{c2}pK^{-})/B(Λ_{b}^{0}→χ_{c1}pK^{-})=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χ_{c1}→J/ψγ and χ_{c2}→J/ψγ decays. Using both decay modes, the mass of the Λ_{b}^{0} baryon is also measured to be m_{Λ_{b}^{0}}=5619.44±0.28±0.26 MeV/c^{2}, where the first and second uncertainties are statistical and systematic, respectively.
报告了对衰变(\Lambda_{b}^{0}\to\chi_{c1}pK^{-})和(\Lambda_{b}^{0}\to\chi_{c2}pK^{-})的首次观测，该观测使用了对应于(3.0,\text{fb}^{-1})积分亮度的数据样本，由大型强子对撞机底夸克实验（LHCb实验）在质心能量为(7)和(8) TeV的质子-质子碰撞中收集。测量了以下分支比的比值：(B(\Lambda_{b}^{0}\to\chi_{c1}pK^{-})/B(\Lambda_{b}^{0}\to J/\psi pK^{-}) = 0.242\pm0.014\pm0.013\pm0.009)，(B(\Lambda_{b}^{0}\to\chi_{c2}pK^{-})/B(\Lambda_{b}^{0}\to J/\psi pK^{-}) = 0.248\pm0.020\pm0.014\pm0.009)，(B(\Lambda_{b}^{0}\to\chi_{c2}pK^{-})/B(\Lambda_{b}^{0}\to\chi_{c1}pK^{-}) = 1.02\pm0.10\pm0.02\pm0.05)，其中第一个不确定度是统计性的，第二个是系统性的，第三个是由于(\chi_{c1}\to J/\psi\gamma)和(\chi_{c2}\to J/\psi\gamma)衰变的分支比的不确定度。使用这两种衰变模式，还测量了(\Lambda_{b}^{0})重子的质量为(m_{\Lambda_{b}^{0}} = 5619.44\pm0.28\pm0.26,\text{MeV}/c^{2})，其中第一个和第二个不确定度分别是统计性的和系统性的数据。
