Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such

Details Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such Three-body Baryonic anti-B -->Lambda anti-p pi Decays and Such

2002-11-15

arxiv.org/abs/hep-ph/0211240v2

Eur.Phys.J.C29:27-35,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 3 figures; use updated Belle results, add Lambda polarization study

Scientific paper

10.1140/epjc/s2003-01203-8

We study decay rates and spectra of anti-B --> Lambda anti-p pi, Sigma0 anti-p pi, Sigma- anti-n pi, Xi0 anti-Sigma+ pi, Xi- anti-Sigma0 pi and Xi- anti-Lambda pi modes under a 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 anti-p pi rate (~4.0x10^{-6}) and spectrum can be understood, and Lambda should be dominantly left-hand polarized, while we expect Br(Sigma0 anti-p pi)~1.6x10^{-6}. These results and other predictions can be checked soon.

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