对一个新的激发态美奇异重子衰变到Ξ_{b}^{-}π^{+}π^{-}的观测。
Observation of a New Excited Beauty Strange Baryon Decaying to Ξ_{b}^{-}π^{+}π^{-}.
作者信息
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D, Savin A, Shang V, Sharma V, Smith W H, Teague D, Trembath-Reichert S, Vetens W
机构信息
Yerevan Physics Institute, Yerevan, Armenia.
Institut für Hochenergiephysik, Wien, Austria.
出版信息
Phys Rev Lett. 2021 Jun 25;126(25):252003. doi: 10.1103/PhysRevLett.126.252003.
The Ξ_{b}^{-}π^{+}π^{-} invariant mass spectrum is investigated with an event sample of proton-proton collisions at sqrt[s]=13 TeV, collected by the CMS experiment at the LHC in 2016-2018 and corresponding to an integrated luminosity of 140 fb^{-1}. The ground state Ξ_{b}^{-} is reconstructed via its decays to J/ψΞ^{-} and J/ψΛK^{-}. A narrow resonance, labeled Ξ_{b}(6100)^{-}, is observed at a Ξ_{b}^{-}π^{+}π^{-} invariant mass of 6100.3±0.2(stat)±0.1(syst)±0.6(Ξ_{b}^{-}) MeV, where the last uncertainty reflects the precision of the Ξ_{b}^{-} baryon mass. The upper limit on the Ξ_{b}(6100)^{-} natural width is determined to be 1.9 MeV at 95% confidence level. The low Ξ_{b}(6100)^{-} signal yield observed in data does not allow a measurement of the quantum numbers of the new state. However, following analogies with the established excited Ξ_{c} baryon states, the new Ξ_{b}(6100)^{-} resonance and its decay sequence are consistent with the orbitally excited Ξ_{b}^{-} baryon, with spin and parity quantum numbers J^{P}=3/2^{-}.
利用大型强子对撞机（LHC）上的紧凑缪子线圈（CMS）实验在2016 - 2018年收集的质心能量(\sqrt{s}=13) TeV的质子 - 质子碰撞事件样本，研究了(\Xi_{b}^{-}\pi^{+}\pi^{-})不变质量谱，该样本对应的积分亮度为140 (fb^{-1})。通过(\Xi_{b}^{-})衰变为(J/\psi\Xi^{-})和(J/\psi\Lambda K^{-})来重建基态(\Xi_{b}^{-})。在(\Xi_{b}^{-}\pi^{+}\pi^{-})不变质量为6100.3±0.2（统计）±0.1（系统）±0.6（(\Xi_{b}^{-})）MeV处观察到一个窄共振，标记为(\Xi_{b}(6100)^{-})，其中最后一个不确定度反映了(\Xi_{b}^{-})重子质量的精度。在95%置信水平下，(\Xi_{b}(6100)^{-})的自然宽度上限确定为1.9 MeV。在数据中观察到的低(\Xi_{b}(6100)^{-})信号产额不允许对新态的量子数进行测量。然而，根据与已确立的激发(\Xi_{c})重子态的类比，新的(\Xi_{b}(6100)^{-})共振及其衰变序列与轨道激发的(\Xi_{b}^{-})重子一致，自旋和宇称量子数为(J^{P}=3/2^{-})。
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