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Observation of the doubly strange b baryon Omega_b-

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arxiv 0808.4142 v2 pith:M5UBB3IS submitted 2008-08-29 hep-ex

Observation of the doubly strange b baryon Omega_b-

classification hep-ex
keywords omegabaryondoublyobservationomega-signalstatstrange
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the observation of the doubly strange b baryon Omega_b- in the decay channel Omega_b- to J/psi Omega-, with J/psi to mu+ mu- and Omega- to Lambda K-, in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV. Using approximately 1.3 fb$^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8 +/- 4.9 (stat) +/- 0.8 (syst) Omega_b- signal events at a mass of 6.165 +/- 0.010 (stat) +/- 0.013(syst.) GeV. The significance of the observed signal is 5.4 sigma, corresponding to a probability of 6.7 x 10^{-8} of it arising from a background fluctuation.

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Cited by 3 Pith papers

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  2. Semileptonic and nonleptonic weak decays of bottom baryons $\Omega^{(*)}_{b}$

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    QCD sum-rule calculation predicts Ω_b^*→Ω_c and Ω_b→Ω_c^* semileptonic and nonleptonic decay widths, e.g. Γ(Ω_b^*→Ω_c eν)=(1.54+0.29−0.27)×10^-14 GeV.

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    hep-ph 2026-05 unverdicted novelty 3.0

    Mass spectra of 1F-wave singly heavy baryons computed via Regge trajectory model in quark-diquark configuration with spin-dependent mass shifts.