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Observation of B+ --> Lambda c+ Lambda c- K+ and B0 --> Lambda c+ Lambda c- K0 decays.

N Gabyshev1, K Abe, K Abe

  • 1Budker Institute of Nuclear Physics, Novosibirsk.

Physical Review Letters
|December 13, 2006
PubMed

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Summary
This summary is machine-generated.

Researchers observed new doubly charmed baryonic B decays, specifically B+ to Lambda c+ Lambda c- K+ and B0 to Lambda c+ Lambda c- K0. These findings advance understanding of particle physics and B meson decays.

Area of Science:

  • High Energy Physics
  • Particle Physics
  • Quantum Chromodynamics

Background:

  • Baryonic B decays provide a unique window into the Standard Model.
  • Doubly charmed baryons, containing two charm quarks, are rare and complex systems.
  • Previous studies have explored various B decay modes, but doubly charmed baryonic decays remain less explored.

Purpose of the Study:

  • To report the first measurements of the doubly charmed baryonic B decays B --> Lambda c+ Lambda c- K.
  • To determine the branching fractions and statistical significance of these newly observed decay modes.
  • To contribute to the understanding of heavy quark dynamics and B meson structure.

Main Methods:

  • Analysis of 357 fb^-1 of data collected at the Upsilon(4S) resonance using the Belle detector.

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  • Reconstruction of B+ --> Lambda c+ Lambda c- K+ and B0 --> Lambda c+ Lambda c- K0 decay channels.
  • Statistical analysis to determine branching fractions and significance, accounting for various error sources.

    • Main Results:

    • Observation of the B+ --> Lambda c+ Lambda c- K+ decay with a branching fraction of (6.5(-0.9)(+1.0)±1.1±3.4)x10^-4 and 15.4 sigma significance.
    • Observation of the B0 --> Lambda c+ Lambda c- K0 decay with a branching fraction of (7.9(-2.3)(+2.9)±1.2±4.1)x10^-4 and 6.6 sigma significance.
    • Branching fraction uncertainties include statistical, systematic, and contributions from Lambda c+ decay uncertainty.

    Conclusions:

    • The first experimental evidence for doubly charmed baryonic B decays has been established.
    • These measurements provide crucial data for theoretical models of heavy meson decays and particle spectroscopy.
    • Further studies can explore the properties of these decays and search for other related phenomena.