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Three-body baryonic \(\overline B\to \Lambda \bar p \pi\) decays and such

  • C.-K. Chua
  • W.-S. Hou
Theoretical Physics

Abstract.

We study the decay rates and spectra of \(\overline B\to \Lambda \bar p \pi\), \(\Sigma^0 \bar p \pi\), \(\Sigma^- \bar n \pi\), \(\Xi^0 \overline \Sigma {}^+ \pi\), \(\Xi^- \overline \Sigma {}^0 \pi\) and \(\Xi^- \overline \Lambda \pi\) modes in the factorization approach. The baryon pairs are produced through vector, axial vector, scalar and pseudoscalar operators. Previous predictions, including ours, are an order of magnitude too small compared to experiment. By incorporating QCD counting rules and studying the asymptotic behavior, we find an earlier relation between the pseudoscalar and axial vector form factors to be too restrictive. Instead, the pseudoscalar and scalar form factors are related asymptotically. Following this approach, the measured \(\Lambda \bar p \pi^+\) rate (\(\sim 4.0 \times 10^{-6}\)) and spectrum can be understood, and \(\Lambda\) should be dominantly left-hand polarized, while we expect \(\cal B(\Sigma^0 \bar p \pi^+)\simeq 1.6\times 10^{-6}\). These results and other predictions can be checked soon.

Keywords

Form Factor Asymptotic Behavior Decay Rate Vector Form Scalar Form 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica 2003

Authors and Affiliations

  • C.-K. Chua
    • 1
  • W.-S. Hou
    • 1
  1. 1.Department of Physics, National Taiwan University, Taipei, Taiwan 10764, China CN

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