Observation of the Xi_b^0 Baryon

Abstract

The observation of the bottom, strange baryon ${\Xi }_b^0$ through the decay chain ${\Xi }_b^0\to {\Xi }_c^{+}{\pi }^{-}$, where ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$, ${\Xi }^{-}\to \Lambda {\pi }^{-}$, and $\Lambda \to p{\pi }^{-}$, is reported using data corresponding to an integrated luminosity of 4.2 fb${}^{-1}$ from $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV recorded with the Collider Detector at Fermilab. A signal of $25.3_{-5.4}^{+5.6}$ candidates is observed whose probability of arising from a background fluctuation is $3.6\times 10^{-12}$, corresponding to 6.8 Gaussian standard deviations. The ${\Xi }_b^0$ mass is measured to be $5787.8\pm 5.0(\text{stat})\pm 1.3(\text{syst})$ MeV/$c^2$. In addition, the ${\Xi }_b^{-}$ baryon is observed through the process ${\Xi }_b^{-}\to {\Xi }_c^0{\pi }^{-}$, where ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}$, ${\Xi }^{-}\to \Lambda {\pi }^{-}$, and $\Lambda \to p{\pi }^{-}$.

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Cited by in corpus (24)

• Progress Toward Understanding Baryon Resonances
• Observation of excited Lambda_b0 baryons
• Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
• Observation of a new Xi(b) baryon
• Calculation of the heavy-hadron axial couplings g_1, g_2, and g_3 using lattice QCD
• Observation of two new ${\Xi }_b^{-}$ baryon resonances
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Ground-State Masses and Magnetic Moments of Heavy Baryons
• Studies of beauty baryon decays to $D^{0}p{h}^{-}$ and ${\Lambda }_c^{+}{h}^{-}$ final states
• Magnetic Moments of Bottom Baryons: Effective mass and Screened Charge
• Evidence for a bottom baryon resonance Lambda_b* in CDF data
• Mass and lifetime measurements of bottom and charm baryons in $p\bar{p}$ collisions at $\sqrt{s}= 1.96 TeV
• Measurement of the masses and widths of the bottom baryons Sigma_b+- and Sigma_b*+-
• Systematic analysis of strange single heavy baryons ${\Xi }_c$ and ${\Xi }_b$
• Observation of new baryons in the ${\Xi }_b^{-}{\pi }^{+}{\pi }^{-}$ and ${\Xi }_b^0{\pi }^{+}{\pi }^{-}$ systems
• Axial-Vector Emitting Weak Nonleptonic Deacys of ${\Omega }_c^0$ Baryon
• Dipion decays of heavy baryons
• Decay widths and mass spectra of single bottom baryons
• The $\Lambda$-type P-wave bottom baryon states via the QCD sum rules
• Observation of the ${\Xi }_{\mathrm{b}}^{-}$ $\to$ $\psi$(2S)${\Xi }^{-}$ decay and studies of the ${\Xi }_{\mathrm{b}}$(5945)${}^0$ baryon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• B-physics results from Tevatron
• Review of Physics Results from the Tevatron: Heavy Flavor Physics
• Magnetic moments of ${\Xi }_Q^{\prime }$-${\Xi }_Q$ transitions in light cone QCD
• Probing the inner structures of the observed ${\Xi }_b$ and ${\Xi }_b^{\prime }$ resonances