Observation of two resonances in the ${\Lambda }_b^0{\pi }^{\pm }$ systems and precise measurement of ${\Sigma }_b^{\pm }$ and ${\Sigma }_b^{\ast \pm }$ properties

Abstract

The first observation of two structures consistent with resonances in the final states ${\Lambda }_b^0{\pi }^{-}$ and ${\Lambda }_b^0{\pi }^{+}$ is reported using samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$ and $8$ TeV, corresponding to an integrated luminosity of 3 ${\mathrm{fb}}^{-1}$. The ground states ${\Sigma }_b^{\pm }$ and ${\Sigma }_b^{\ast \pm }$ are also confirmed and their masses and widths are precisely measured.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-032.html

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