Inclusive semileptonic decays of polarized Λb Baryons into polarized τ-leptons

TECHNION - PH 97 - 02 Inclusive Semileptonic Decays of Polarized Λ b Baryons into Polarized τ - Leptons

Inclusive Semileptonic B and Polarized Λb Decays from QCD

The differential decay spectrum dΓ/dEedq 2 for the semileptonic decay of an unpolarized hadron containing a b-quark, and the decay spectrum dΓ/dEedq dcos θ for polarized Λb decay are computed to second order in the 1/mb expansion. Most of the 1/m 2 b corrections have a simple physical interpretation, which is discussed in detail. The implications of the results for the determination of Vub are ...

Spin - Momentum Correlations in Inclusive Semileptonic Decays of Polarized Λ b - Baryons

We consider spin-momentum correlations between the spin of the bottom baryon Λ b and the momenta of its decay products in its inclusive semilep-tonic decay. We define several polar and azimuthal spin-momentum correlation measures in different event coordinate systems. The values of the spin-momentum correlation measures are calculated up to O(1/m 2 b) using the standard OPE und HQET methods. So...

Strong Corrections to Inclusive B → Xτν τ Decays

We calculate the αs corrections to the form factors which parameterize the hadronic tensor relevant for inclusive semileptonic B → Xτντ and Λb → Xτντ decays. We apply our results to the double differential decay rates for the decays of B mesons and polarized Λb baryons to polarized τ leptons, presenting them in terms of one-dimensional integrals. Formulas appropriate for insertion into a Monte-...

Testing Time-Reversal: Λb Decays into Polarized Resonances

Weak decays of beauty baryons like Λb into ΛV (J P = 1−), where the produced resonances are polarized, offer interesting opportunity to perform tests of TimeReversal Invariance. This paper emphasizes the particular role of the resonance polarization-vectors and their physical properties by symmetry transformations. In particular, it is shown that the normal component of a polarization-vector, a...