$\mathit CP$ VIOLATION PARAMETERS

$\Delta \mathit S_{ {{\mathit a}_{{1}}} {{\mathit \pi}} }$ ( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit a}_{{1}}{(1260)}^{+}}{{\mathit \pi}^{-}}$ )

INSPIRE   PDGID:
S042SDA
$\Delta \mathit S_{ {{\mathit a}_{{1}}} {{\mathit \pi}} }$ is related to the strong phase difference between the amplitudes contributing to ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit a}_{{1}}}{{\mathit \pi}}$ decays.
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ -0.11 \pm0.12}$ OUR AVERAGE
$-0.09$ $\pm0.14$ $\pm0.06$
DALSENO
2012
BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$-0.14$ $\pm0.21$ $\pm0.06$
AUBERT
2007O
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
Conservation Laws:
$\mathit CP$ INVARIANCE
References:
DALSENO 2012
PR D86 092012 Measurement of Branching Fraction and First Evidence of $\mathit CP$ Violation in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit a}_{{1}}{(1260)}^{\pm}}{{\mathit \pi}^{\pm}}$ Decays
AUBERT 2007O
PRL 98 181803 Measurements of $\mathit CP$-Violating Asymmetries in ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit a}_{{1}}{(1260)}^{\pm}}{{\mathit \pi}^{\mp}}$ Decays