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First Observation of Excited Ω_{b}^{-} States.

R Aaij1, C Abellán Beteta2, T Ackernley3

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Summary
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LHCb experiment data reveals four new narrow peaks in the Omega_b- (Ωb−) meson spectrum. These findings suggest the potential discovery of excited Omega_b- resonances, opening new avenues in particle physics research.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Hadron Spectroscopy

Background:

  • The study of exotic hadrons provides crucial insights into the strong nuclear force and quantum chromodynamics.
  • Previous searches for excited Omega_b- (Ωb−) states have yielded limited conclusive evidence.

Purpose of the Study:

  • To search for and characterize new narrow resonances in the Ξ_{b}^{0}K^{-} mass spectrum.
  • To investigate the properties, including mass and width, of observed structures in the data.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV.
  • Utilized a total integrated luminosity of 9 fb^{-1}.
  • Performed a mass spectrum analysis of the Ξ_{b}^{0}K^{-} system to identify resonant structures.

Main Results:

  • Observed four narrow peaks in the Ξ_{b}^{0}K^{-} mass spectrum, designated as Ω_{b}(6316)^{-}, Ω_{b}(6330)^{-}, Ω_{b}(6340)^{-}, and Ω_{b}(6350)^{-}.
  • Measured mass values for the peaks range from approximately 6315 MeV to 6350 MeV.
  • The natural widths of the three lower-mass states are consistent with zero, while the Ω_{b}(6350)^{-} has a measured width of 1.4_{-0.8}^{+1.0}±0.1 MeV.
  • Local significances of the peaks range from 3.6σ to 7.2σ, with two higher mass peaks exceeding 5σ after accounting for the look-elsewhere effect.

Conclusions:

  • The observed structures are consistent with expectations for excited Ω_{b}^{-} resonances.
  • The discovery of these narrow peaks provides compelling evidence for new states in the Ω_{b}^{-} baryon family.
  • Further theoretical and experimental studies are warranted to confirm and understand the nature of these newly observed resonances.