We study the dilepton forward-backward and the longitudinal, normal and transverse lepton polarization asymmetries in the heavy baryon decays of Λb → Λl+l-. We show that the asymmetries have a less dependence on the nonperturbative QCD effects. In the standard model, we find that the integrated forward-backward asymmetries (FBAs) and three components of the polarizations in the QCD sum rule approach (pole model) are -0.13 (-0.12) and (58.3, -9.4, -0.07)% ((58.3,-12.6,-0.07)%) for Λb → Λμ+μ- and -0.04 (-0.03) and (10.9, -10.0, -0.39)% ((10.9, -0.2, -0.34)%) for Λb → Λτ+τ-, respectively.
|頁（從 - 到）||327-336|
|期刊||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|出版狀態||Published - 2001 九月 20|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics