Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of two new excited ${\it\Xi}_b^0$ states decaying to
  ${\it\Lambda}_b^0 K^-\pi^+$   Two narrow resonant states are observed in the ${\it\Lambda}_b^0 K^-\pi^+$
mass spectrum using a data sample of proton-proton collisions at a
center-of-mass energy of 13$~\rm TeV$, collected by the LHCb experiment and
corresponding to an integrated luminosity of $6~{\rm fb}^{-1}$. The minimal
quark content of the ${\it\Lambda}_b^0 K^-\pi^+$ system indicates that these
are excited ${\it\Xi}_b^0$ baryons. The masses of the ${\it\Xi}_b(6327)^0$ and
${\it\Xi}_b(6333)^0$ states are $m({\it\Xi}_b(6327)^0) = 6327.28
^{\,+\,0.23}_{\,-\,0.21} \pm 0.12 \pm 0.24~{\rm MeV}$ and
$m({\it\Xi}_b(6333)^0) = 6332.69 ^{\,+\,0.17}_{\,-\,0.18} \pm 0.03 \pm
0.22~{\rm MeV}$, respectively, with a mass splitting of $\Delta m = 5.41
^{\,+\,0.26}_{\,-\,0.27} \pm 0.12 ~{\rm MeV}$, where the uncertainties are
statistical, systematic and due to the ${\it\Lambda}_b^0$ mass measurement. The
measured natural widths of these states are consistent with zero, with upper
limits of $\Gamma({\it\Xi}_b(6327)^0)<2.20~(2.56) ~{\rm MeV}$ and
$\Gamma({\it\Xi}_b(6333)^0)<1.60~(1.92) ~{\rm MeV}$ at a $90\%~(95\%)$
credibility level. The significance of the two-peak hypothesis is larger than
nine (five) Gaussian standard deviations compared to the no-peak (one-peak)
hypothesis. The masses, widths and resonant structure of the new states are in
good agreement with the expectations for a doublet of 1$D$ ${\it\Xi}_b^0$
resonances.

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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph