Observation of the Ξ_b⁰

Decay chains
Ξ_b^-→ Ξ_c⁰π^-, Ξ_c⁰→ Ξ^-π⁺, Ξ^-→ Λ π^-, Λ → p π^- and Ξ_b⁰→ Ξ_c⁺π^-, Ξ_c⁺→ Ξ^-π⁺π⁺, Ξ^-→ Λ π^-, Λ → p π^-
Figures in support of the analysis:
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pπ distribution in a 44 pb^-1 subset of the data. Shaded area indicates the signal region.
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Λ π distribution in a 44 pb^-1 subset of the data. Shaded area indicates the signal region.
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Λ K; distribution in a 44 pb^-1 subset of the data. Shaded area indicates the signal region. This is not used in this analysis.
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Λπ distribution in a 44 pb^-1 subset of the data, where SVX II hits are required on the Ξ^- track and the impact with respect to the beam is less than 100 μm. Shaded area indicates the signal region. eps version
Λ K distribution in a 44 pb^-1 subset of the data, where SVX II hits are required on the Ξ^- track and the impact with respect to the beam is less than 100 μm. . Shaded area indicates the signal region. This is not used in this analysis.
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The Ξ^-π⁺ mass distribution. Shaded areas indicate the signal region and mass sideband regions.
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The Ξ^-π⁺π⁺ mass distribution. Shaded areas indicate the signal region and mass sideband regions.
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Λ K; distribution in a 44 pb^-1 subset of the data. Shaded area indicates the signal region. This is not used in this analysis.
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The Λ_c⁺π^- mass distribution. A fit to the data is superimposed.
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The Λ_c⁺π^- mass distribution where the impact to the beam is less than 100 μm. A fit to the data is superimposed.
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The Λ_c⁺π^- mass distribution for the subset with -70 μm < ct(Λ_c⁺) < 200 μm. A fit to the data is superimposed.
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The Λ_c⁺π^- mass distribution for the subset with -2σ < ct(Λ_c⁺) < 3c&tau(Λ_c⁺) + 2σ. A fit to the data is superimposed.
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The Ξ_c⁰π^- mass distribution without impact or decay Ξ_c⁰ time requirements.
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The Ξ_c⁰π^- mass vs. the impact.
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The Ξ_c⁰π^- mass distribution for the subset with |impact| < 100 μm.
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The Ξ_c⁰π^- mass vs. the decay time of the Ξ_c⁰.
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The Ξ_c⁰π^- mass distribution for the subset with -2σ_ct < ct(Ξ_c⁰) < 3cτ + 2σ_ct.
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Ξ_c⁰ π^- distribution.
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Ξ_c⁰ π^- distribution.
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The Ξ^-π⁺π^- mass vs. the Ξ^-π⁺ mass.
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The Ξ⁰π⁺π^- mass distribution for candidates consistent with Ξ_c⁰ combinations and for the mass sidebands.
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The Ξ_c⁺π^- mass distribution without impact or decay Ξ_c⁺ time requirements.
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The Ξ_c⁺π^- mass vs. the impact.
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The Ξ_c⁺π^- mass distribution for the subset with |impact| < 100 μm.
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The Ξ_c⁺π^- mass vs. the decay time of the Ξ_c⁺.
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The Ξ_c⁺π^- mass distribution for the subset with -2σ_ct < ct(Ξ_c⁺) < 3cτ + 2σ_ct.
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Ξ_c⁺ π^- distribution.
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Ξ_c⁺ π^- distribution.
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The Ξ^-π⁺π⁺π^- mass vs. the Ξ^-π⁺π⁺ mass.
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The Ξ⁰π⁺π⁺π^- mass distribution for candidates consistent with Ξ_c⁺ combinations and for the mass sidebands.
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Ξ_c⁰ π^- distribution. The projection of the unbinned likelihood fit is overlaid in a dashed line. eps version
Ξ_c⁺ π^- distribution. The projection of the unbinned likelihood fit is overlaid in a dashed line. eps version
Ξ^- π⁺ distribution. The projection of the unbinned likelihood fit is overlaid in a dashed line. eps version
Ξ^- π⁺ π⁺ distribution. The projection of the unbinned likelihood fit is overlaid in a dashed line.