Measurement of the properties of the ${\Xi }_b^{\ast 0}$ baryon

Abstract

We perform a search for near-threshold ${\Xi }_b^0$ resonances decaying to ${\Xi }_b^{-}{\pi }^{+}$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb${}^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(Ξ_b^{*0}) - m(Ξ_b^-) - m(π^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, Γ(Ξ_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} . \end{eqnarray*} This confirms the previous observation by the CMS collaboration. The state is consistent with the $J^P=3/2^{+}$ ${\Xi }_b^{\ast 0}$ resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio \begin{align*} \frac{σ(pp \to Ξ_b^{*0} X){\cal{B}}(Ξ_b^{*0} \to Ξ_b^- π^+)}{σ(pp \to Ξ_b^- X)} = 0.28 \pm 0.03 \, (\mathrm{stat}) \pm 0.01 \, (\mathrm{syst}) . \end{align*}

arXiv comment19 pages, 5 figures. All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-010.html

References in corpus (31)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• Big-Bang Nucleosynthesis
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• The LHCb Trigger and its Performance in 2011
• Decay Chain Fitting with a Kalman Filter
• Baryon spectroscopy
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• Charmed bottom baryon spectroscopy from lattice QCD
• Measurement of the track reconstruction efficiency at LHCb
• Towards an understanding of heavy baryon spectroscopy
• Masses of heavy baryons in the relativistic quark model
• Strong decays of charmed baryons
• The Quark Model and $b$ Baryons
• Bottom Baryons
• Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
• Precision measurement of D meson mass differences
• Observation of a new Xi(b) baryon
• Analysis of the ${\frac{3}{2}}^{+}$ heavy and doubly heavy baryon states with QCD sum rules
• Heavy baryon spectroscopy in QCD
• 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
• Bottom baryons from a dynamical lattice QCD simulation
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• Model-Independent Bottom Baryon Mass Predictions in the 1/N Expansion
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Measurement of the D*(2010)+ meson width and the D*(2010)+ - D0 mass difference
• Measurement of the D*(2010)+ natural line width and the D*(2010)+ - D0 mass difference
• Heavy quark spectroscopy and prediction of bottom baryon masses

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