Angular distributions in three-body baryonic B decays

Abstract

We study the angular distributions of the baryon-antibaryon low-mass enhancements in the three-body baryonic B decays of $B\to p\bar{p}M$ (M=K and $\pi$) in the framework of the perturbative QCD. By writing the most general forms for the transition form factors of $B\to p\bar{p}$, we find that the angular distribution asymmetry in $B^{-}\to p\bar{p}{K}^{-}$ measured by the Belle Collaboration can be explained. We give a quantitative description on the Dalitz plot asymmetry in $B^{-}\to p\bar{p}{K}^{-}$ shown by the BaBar Collaboration and demonstrate that it is equivalent to the angular asymmetry. In addition, we present our results on ${\bar{B}}^0\to p\bar{p}{K}_S$ and $B^{-}\to p\bar{p}{\pi }^{-}$ and we obtain that their angular asymmetries are $-0.35\pm 0.11$ and $0.45\pm 0.10$, respectively, which can be tested by the ongoing experiments at the B factories.

4 pages, 2 figures, version to be published in PRD

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• The Physics of the B Factories
• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Charmful Three-body Baryonic B decays
• Direct CP violation in $B^{\pm }\to p\bar{p}{K}^{(\ast )\pm }$
• Violation of PCAC and two-body baryonic $B$ and $D_s$ decays
• Charmless Two-body Baryonic $B_{u,d,s}$ Decays Revisited
• Direct CP violation in internal W-emission dominated baryonic B decays
• Study of $B\to p\bar{p}{K}^{\ast }$ and $B\to p\bar{p}\rho$
• Identifying Glueball at 3.02 GeV in Baryonic $B$ Decays
• Direct CP and T Violation in Baryonic B Decays
• Three-body charmless baryonic ${\bar{B}}_s^0$ decays
• Final stare interaction enhancement effect on the near threshold p\bar p system in B^\pm\to p\bar p \p^\pm decay
• Baryonic $B$ meson decays
• Factorization and angular distribution asymmetries in charmful baryonic B decays
• Study of $\bar{B}\to \Lambda \bar{p}\rho (\varphi )$ and $\bar{B}\to \Lambda \bar{\Lambda }{\bar{K}}^{\ast }$
• Possibly New Charmed Baryon States from ${\bar{B}}^0\to p\bar{p}{D}^0$ Decay
• $f_J(2220)$ and Hadronic ${\bar{B}}_s^0$ Decays
• Charmful baryonic B\to {\bf B\bar B'}M_c decays
• Semileptonic $B-\to p\bar{p}\ell -{\bar{\nu }}_{\ell }$ decays
• Observation of $B^0\to p\bar{\Lambda }{D}^{(\ast )-}$
• Four-body baryonic $B\to {\mathbf{B}}_1{\bar{\mathbf{B}}}_1^{\prime }{\mathbf{B}}_2{\bar{\mathbf{B}}}_2^{\prime }$ decays
• Study of $B^{-}\to \Lambda \bar{p}{\eta }^{{(}^{\prime })}$ and ${\bar{B}}_s^0\to \Lambda \bar{\Lambda }{\eta }^{{(}^{\prime })}$ decays
• Determination of $|V_{ub}|$ from exclusive baryonic $B$ decays
• Observation of the semileptonic decay $B^{+}\to p\overline{p}{\mu }^{+}{\nu }_{\mu }$
• Angular asymmetries in $B\to \Lambda \bar{p}M$ decays
• Phenomenological Analysis of the Decay $B^{\pm}\to K^{\pm} p {\bar p}
• Observation of the decay $B_s^0\to K^{0}p\bar{p}$ and measurement of the $B_{(s)}^0\to K^{0}p\bar{p}$ branching fractions