2018/05/23 by R. Aaij, B. Adeva, M. Adinolfi +807 · 1 voice · 1 citation
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1103/physrevlett.121.072002
published as Phys. Rev. Lett. 121, 072002 (2018) · 8 pages, 3 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-013.html
arxiv published 2018/05/23 · arxiv created 2018/08/16 · arxiv updated 2018/08/16
From samples of pp collision data collected by the LHCb experiment at √(s)=7, 8 and 13 TeV corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb-1, respectively, a peak in both the Λb0K- and Ξb0π- invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξb- resonances with quark content bds are expected. Referring to this peak as Ξb(6227)-, the mass and natural width are measured to be m_Ξb(6227)-=6226.9±2.0±0.3±0.2 MeV/c2 and ΓΞb(6227)-=18.1±5.4±1.8 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third, on mΞb(6227)-, is due to the knowledge of the Λb0 baryon mass. Relative production rates of the Ξb(6227)-→Λb0K- and Ξb(6227)-→Ξb0π- decays are also reported.