Observation of a new ${\Xi }_b^{-}$ resonance

Abstract

From samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$, $8$ and $13$ TeV corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb${}^{-1}$, respectively, a peak in both the ${\Lambda }_b^0{K}^{-}$ and ${\Xi }_b^0{\pi }^{-}$ invariant mass spectra is observed. In the quark model, radially and orbitally excited ${\Xi }_b^{-}$ resonances with quark content $bds$ are expected. Referring to this peak as ${\Xi }_b(6227{)}^{-}$, the mass and natural width are measured to be $m_{{\Xi }_b(6227{)}^{-}}=6226.9\pm 2.0\pm 0.3\pm 0.2$ MeV/$c^2$ and ${\Gamma }_{{\Xi }_b(6227{)}^{-}}=18.1\pm 5.4\pm 1.8$ MeV/$c^2$, where the first uncertainty is statistical, the second is systematic, and the third, on $m_{{\Xi }_b(6227{)}^{-}}$, is due to the knowledge of the ${\Lambda }_b^0$ baryon mass. Relative production rates of the ${\Xi }_b(6227{)}^{-}\to {\Lambda }_b^0{K}^{-}$ and ${\Xi }_b(6227{)}^{-}\to {\Xi }_b^0{\pi }^{-}$ decays are also reported.

arXiv comment8 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

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