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Observation of two resonances in the Λ_b⁰ π^pm systems and precise measurement of Sigma_b^pm and Sigma_b^(*pm) properties
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arxiv 1809.07752 v3 pith:3RIBHR6X submitted 2018-09-20 hep-ex
Observation of two resonances in the Λ_b⁰ π^pm systems and precise measurement of Sigma_b^pm and Sigma_b^(*pm) properties
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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 $\Sigma_b^{*\pm}$ are also confirmed and their masses and widths are precisely measured.
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