O. Adriani et al., INCLUSIVE SEARCH FOR THE CHARMLESS RADIATIVE DECAY OF THE B-QUARK (B-]S-GAMMA), Physics letters. Section B, 317(4), 1993, pp. 637-646
We report on the search for the electromagnetic penguin decay b --> sg
amma at square-root s almost-equal-to m(Z). We find no evidence for a
signal and place an upper limit on the decay rate Br(b --> sgamma) < 1
.2 x 10(-3) at 90% C.L.