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In $B \to X_s \gamma $ there are perturbative $QCD$ corrections at order$\alpha_s$ not only to the single quark line process $ b \to s \gamma$ but alsocoming from a set of diagrams where the weak interaction vertex involves agluon which interacts with the spectator quark in the B hadron. We discuss theimpact of the full set of these diagrams. These can influence the decay rateand also the line shape of the photon spectrum as they favor a softer photonenergy than does the pure spectator decay $b \to s \gamma$. A subset of thesediagrams generate differences in the decay rates for charged and neutral B's ,$B^+ \to X_s \gamma$ vs. $B^0 \to X_s \gamma$ which can be searched forexperimentally, although our calculation indicates that the effect will be hardto observe. Bound state effects turn out to be required to give rise tospectator corrections to the decay rate at order $\alpha_s$. The resultingcontribution to the total rate is rather small (of about $5 \% $ ), althoughthe effect is somewhat larger on portions of the photon spectrum.Comment: 17 pages, 3 Postscript figures, uses epsf.st

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

IsB→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">X</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">s</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>γ equal tob→sγ? Spectator contributions to rare inclusiveBdecays

IsB→Xsγ equal tob→sγ? Spectator contributions to rare inclusiveBdecays