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- W1966950265 abstract "We investigate the rare baryonic exclusive decays of $Lambda_bto Lambda l^+ (l=e,mu,tau)$ with polarized $Lambda $. Under the approximation of the heavy quark effective theory (HQET), in the standard model we derive the differential decay rates and various polarization asymmetries by including lepton mass effects. We find that with the long-distance effects the decay branching ratios are $5.3times 10^{-5}$ for $Lambda_bto Lambda l^+ l^- (l=e,mu)$ and $1.1times 10^{-5}$ for $Lambda_bto Lambda tau^+tau^-$. The effects of new physics in the decay rates are also discussed. The integrated longitudinal $Lambda$ polarizations are -0.31 and -0.12, while that of the normal ones 0.02 and 0.01, for di-muon and tau modes, respectively. The CP-odd transverse polarization of $Lambda$ is zero in the standard model but it is expected to be sizable in some theories with new physics." @default.
- W1966950265 created "2016-06-24" @default.
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- W1966950265 date "2001-01-17" @default.
- W1966950265 modified "2023-09-24" @default.
- W1966950265 title "Rare Lambda(b) ---> Lambda lepton+ lepton- decays with polarized lambda" @default.
- W1966950265 hasPublicationYear "2001" @default.
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