Lepton Asymmetries in Heavy Baryon Decays of $Λ_b\toΛ l^+l^-$

Details Lepton Asymmetries in Heavy Baryon Decays of $Λ_b\toΛ l^+l^-$ Lepton Asymmetries in Heavy Baryon Decays of $Λ_b\toΛ l^+l^-$

2001-01-18

arxiv.org/abs/hep-ph/0101201v2

Phys.Lett. B516 (2001) 327-336

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 9 figures, revised version

Scientific paper

10.1016/S0370-2693(01)00937-6

We study the dilepton forward-backward and the longitudinal, normal and transverse lepton polarization asymmetries in the heavy baryon decays of $\Lambda_b\to\Lambda l^+l^-$. We show that the asymmetries have a less dependence on the non-perturbative 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 $\Lambda_b\to\Lambda\mu^+\mu^-$ and $-0.04 (-0.03)$ and $(10.9,-10.0,-0.39)%$ ($(10.9,-0.2,-0.34)%$) for $\Lambda_b\to\Lambda\tau^+\tau^-$, respectively.

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