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Observation of a New Ξ_{b}^{-} Resonance.

R Aaij1, B Adeva2, M Adinolfi3

  • 1Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.

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LHCb experiment data reveals a new Ξ_{b}(6227)^{-} resonance. This particle, with quark content bds, was observed in pp collisions at various energies, providing insights into excited beauty baryon states.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • The Standard Model of particle physics predicts various excited baryon states.
  • The Ξ_{b}^{-} baryon is a beauty baryon with quark content bds.
  • Understanding excited states provides crucial tests for theoretical models like the quark model.

Purpose of the Study:

  • To search for and characterize radially and orbitally excited Ξ_{b}^{-} resonances.
  • To measure the mass and natural width of a newly observed resonance.
  • To determine the relative production rates of its decay modes.

Main Methods:

  • Analysis of proton-proton collision data collected by the LHCb experiment.
  • Invariant mass spectrum reconstruction for Λ_{b}^{0}K^{-} and Ξ_{b}^{0}π^{-} final states.
  • Statistical analysis to determine resonance parameters and significance.

Main Results:

  • Observation of a significant peak in the invariant mass spectra, denoted as Ξ_{b}(6227)^{-}.
  • Measurement of the mass: m_{Ξ_{b}(6227)^{-}} = 6226.9 ± 2.0 ± 0.3 ± 0.2 MeV/c².
  • Measurement of the natural width: Γ_{Ξ_{b}(6227)^{-}} = 18.1 ± 5.4 ± 1.8 MeV/c².
  • Measurement of relative production rates for the observed decay channels.

Conclusions:

  • The observed Ξ_{b}(6227)^{-} is consistent with theoretical expectations for excited Ξ_{b}^{-} states.
  • This discovery enriches the spectrum of known beauty baryons.
  • Further studies can refine measurements and explore other decay modes.