pdgLive Home   >   TESTS OF DISCRETE SPACE-TIME SYMMETRIES  >   $\mathit CP$ INVARIANCE   >   ${{\overline{\mathit A}}}_{CP}$( ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) = ($\mathit A_{CP}$( ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) + $\mathit A_{CP}$( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ))/2

$\mathit CP$ 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.

${{\overline{\mathit A}}}_{CP}$( ${{\mathit B}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) = ($\mathit A_{CP}$( ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ) + $\mathit A_{CP}$( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit X}_{{s}}}{{\mathit \gamma}}$ ))/2

INSPIRE   PDGID:

S049A06

VALUE DOCUMENT ID TECN  COMMENT $0.0091$ $\pm0.0121$ $\pm0.0013$ 1 WATANUKI 2019 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ 1  Using a sum-of-exclusive technique with ${\mathit m}_{{{\mathit X}_{{s}}}}$ $<$ 2.8 GeV/c${}^{2}$.

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

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