arXiv subjects
Publications and source records attributed to M. Gremm.
We consider the effects of quark-binding on the angular distribution and polarization characteristics of the inclusive decays $Λ_b \to X_s γ$ and $Λ_b \to X_c l \bar{\n}_l$ $(l=e, τ)$, using the methods of heavy quark effective theory.
We study the angular distribution of photons produced in the inclusive decay of a polarized $Λ_b$, $Λ_b\to X_s\,γ$, using the technique of Heavy Quark Effective Theory. Finite non-perturbative corrections are obtained relative to the free quark decay $b\to sγ$. These corrections affect significantly the intensity and polarization of photons emitted at small angles relative to the $Λ_b$ spin direction.
We discuss the longitudinal and transverse $τ$-polarization in inclusive decays of hadrons containing $b$-quarks. The calculation is performed by means of an OPE in HQET. Some mathematical difficulties in calculating transverse polarizations are explained. Numerical results are presented for longitudinal and for transverse polarizations, both in and perpendicular to the decay plane.