$\mathit CP$ VIOLATION

$\mathit A_{CP}$ is defined as
${B( {{\overline{\mathit B}}} \rightarrow {{\overline{\mathit f}}} )–B( {{\mathit B}} \rightarrow {{\mathit f}} )\over B( {{\overline{\mathit B}}} \rightarrow {{\overline{\mathit f}}} )+B( {{\mathit B}} \rightarrow {{\mathit f}} )}$,
the $\mathit CP$-violation charge asymmetry of inclusive ${{\mathit B}^{\pm}}$ and ${{\mathit B}^{0}}$ decay.

$\Delta \mathit A_{CP}$( ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) = $\mathit A_{CP}$( ${{\mathit B}^{\pm}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) $−$ $\mathit A_{CP}$( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ )

INSPIRE   PDGID:
S049DA1
This is the isospin difference of the $\mathit CP$ asymmetries.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 0.041 \pm0.023}$ OUR AVERAGE
$0.0369$ $\pm0.0265$ $\pm0.0076$ 1
WATANUKI
2019
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$0.050$ $\pm0.039$ $\pm0.015$ 2
LEES
2014K
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
1  Using a sum-of-exclusive technique with ${\mathit m}_{{{\mathit X}_{{s}}}}$ $<$ 2.8 GeV/c${}^{2}$.
2  Measured with 16 exclusively reconstructed ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ decays with 0.6 $<$ ${\mathit m}_{{{\mathit X}_{{s}}}}<$ 2.0 GeV/c${}^{2}$ (ten charged and six neutral self-tagging ${{\mathit B}}$ modes).
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
WATANUKI 2019
PR D99 032012 Measurements of isospin asymmetry and difference of direct $CP$ asymmetries in inclusive $B \to X_s \gamma$ decays
LEES 2014K
PR D90 092001 Measurements of Direct $\mathit CP$ Asymmetries in ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ Decays using Sum of Exclusive Decays