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Precision Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:msub><mml:mi>X</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:mi>γ</mml:mi></mml:math>Photon Energy Spectrum, Branching Fraction, and Direct<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Asymmetry<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi…
The photon spectrum in the inclusive electromagnetic radiative decays of the $B$ meson, $B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma}$ plus $B\ensuremath{\rightarrow}{X}_{d}\ensuremath{\gamma}$, is studied using a data sample of $(382.8\ifmmode\pm\else\textpm\fi{}4.2)\ifmmode\times\else\texttimes\fi{}{10}^{6}\mathit{\ensuremath{\Upsilon}}(4S)\ensuremath{\rightarrow}B\overline{B}$ decays collected by the BABAR experiment at SLAC. The spectrum is used to extract the branching fraction $\mathcal{B}(B\ensuremath{\rightarrow}{X}_{s}\ensuremath{\gamma})=(3.21\ifmmode\pm\else\textpm\fi{}0.33)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ for ${E}_{\ensuremath{\gamma}}>1.8\text{ }\text{ }\mathrm{GeV}$ and the direct $CP$ …