B meson decays to baryons in the diquark model

C.-H.V. Chang; W.-S. Hou

doi:10.1007/s100520200894

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2002) 23: 691-699
https://doi.org/10.1007/s100520200894

Theoretical physics

B meson decays to baryons in the diquark model

C.-H.V. Chang and W.-S. Hou

Department of Physics, National Taiwan Normal University, Taipei, Taiwan, R.O.C.
Department of Physics, National Taiwan University, Taipei, Taiwan, R.O.C.

Received: 27 December 2001
Published online: 5 April 2002

Abstract

We study B meson decays to two charmless baryons in the diquark model, including strong and electroweak penguins as well as the tree operators. It is shown that penguin operators can enhance $\bar{B} \rightarrow{\vec B}_s \bar{{\vec B}}$ considerably, but affect $\bar{B} \rightarrow{\vec B}_1 \bar{{\vec B}}_2$ only slightly, where ${\vec B}_{(1,2)}$ and ${\vec B}_s$ are non-strange and strange baryons, respectively. The $\gamma$ dependence of the decay rates due to tree–penguin interference is illustrated. In principle, some of the ${\vec B}_s \bar{{\vec B}}$ modes could dominate over ${\vec B}_1 \bar{{\vec B}}_2$ for $\gamma > 90^\circ$ , but in general the effect is milder than their mesonic counterparts. This is because the $O_6$ operator can only produce vector but not scalar diquarks, while the opposite is true for $O_1$ and $O_4$ . Predictions from the diquark model are compared to those from the sum rule calculation. The decays $\bar{B} \rightarrow{\vec B}_s \bar{{\vec B}}_s$ and inclusive baryonic decays are also discussed.