$\mathit CP$ VIOLATION

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

$\mathit A_{CP}$( ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \eta}}{{\mathit K}^{+}}{{\mathit \gamma}}$ )

INSPIRE   PDGID:
S041CQ3
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ -0.12 \pm0.07}$ OUR AVERAGE
$-0.09$ $\pm0.10$ $\pm0.01$ 1
AUBERT
2009
BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$-0.16$ $\pm0.09$ $\pm0.06$ 2
NISHIDA
2005
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-0.09$ $\pm0.12$ $\pm0.01$ 1
AUBERT,B
2006M
 BABR Repl. by AUBERT 2009
1  ${\mathit m}_{ {{\mathit \eta}} {{\mathit K}} }$ $<$ 3.25 GeV/c${}^{2}$.
2  ${\mathit m}_{ {{\mathit \eta}} {{\mathit K}} }$ $<$ 2.4 GeV/c${}^{2}$
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
AUBERT 2009
PR D79 011102 Branching Fractions and $\mathit CP$-Violating Asymmetries in Radiative ${{\mathit B}}$ Decays to ${{\mathit \eta}}{{\mathit K}}{{\mathit \gamma}}$
AUBERT,B 2006M
PR D74 031102 Measurement of Branching Fractions in Radiative ${{\mathit B}}$ Decays to ${{\mathit \eta}}{{\mathit K}}{{\mathit \gamma}}$ and Search for ${{\mathit B}}$ Decays to ${{\mathit \eta}^{\,'}}{{\mathit K}}{{\mathit \gamma}}$
NISHIDA 2005
PL B610 23 Observation of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit K}^{+}}{{\mathit \eta}}{{\mathit \gamma}}$