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doi:10.1016/S0370-2693(01)00937-6 
Copyright © 2001 Elsevier Science B.V. All rights reserved.
Lepton asymmetries in heavy baryon decays of Λb→Λl+l−
Received 27 February 2001;
revised 18 March 2001;
accepted 21 March 2001
Editor: T. Yanagida
Available online 10 August 2001.
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Abstract
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.
