M. Gremm et al., ANGULAR-DISTRIBUTION AND POLARIZATION OF PHOTONS IN THE INCLUSIVE DECAY LAMBDA(B)-]X(S)GAMMA, Physics letters. Section B, 355(3-4), 1995, pp. 579-583
We study the angular distribution of photons produced in the inclusive
decay of a polarized Lambda(b), Lambda(b) --> X(s) gamma, using the t
echnique of heavy quark effective theory. Finite non-perturbative corr
ections are obtained relative to the free quark decay b --> s gamma. T
hese corrections affect significantly the intensity and polarization o
f photons emitted at small angles relative to the Lambda(b) spin direc
tion.