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The first observation of two structures consistent with resonances in thefinal states $\Lambda_b^0 \pi^-$ and $\Lambda_b^0 \pi^+$ is reported usingsamples 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 $\Sigma_b^{*\pm}$ arealso confirmed and their masses and widths are precisely measured.

Observation of two resonances in the $\Lambda_b^0 \pi^\pm$ systems and precise measurement of $\Sigma_b^\pm$ and $\Sigma_b^{*\pm}$ properties