$\Delta \mathit C_{ {{\mathit a}_{{1}}} {{\mathit \pi}} }$ describes the asymmetry between the rates $\Gamma\mathrm {( {{\mathit B}^{0}} \rightarrow {{\mathit a}_{{1}}^{+}} {{\mathit \pi}^{-}} )}$ + $\Gamma\mathrm {( {{\overline{\mathit B}}^{0}} \rightarrow {{\mathit a}_{{1}}^{-}} {{\mathit \pi}^{+}} )}$ and $\Gamma\mathrm {( {{\mathit B}^{0}} \rightarrow {{\mathit a}_{{1}}^{-}} {{\mathit \pi}^{+}} )}$ + $\Gamma\mathrm {( {{\overline{\mathit B}}^{0}} \rightarrow {{\mathit a}_{{1}}^{+}} {{\mathit \pi}^{-}} )}$.

VALUE DOCUMENT ID TECN  COMMENT $\bf{ 0.43 \pm0.14}$ OUR AVERAGE  Error includes scale factor of 1.3. $0.54$ $\pm0.11$ $\pm0.07$ DALSENO 2012 BELL ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$ $0.26$ $\pm0.15$ $\pm0.07$ AUBERT 2007 O 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