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${{\mathit K}^{\pm}}$
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A$_{FB}({{\mathit K}}{}^{\pm{}}_{{{\mathit \pi}} {{\mathit \mu}} {{\mathit \mu}} }$) = ${\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })>0)}−\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })<0)}\over \Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })>0)}+\Gamma\mathrm {(cos({{\mathit \theta}}_{ {{\mathit K}} {{\mathit \mu}} })<0)}}$
FORWARD-BACKWARD ASYMMETRY IN ${{\boldsymbol K}^{\pm}}$ DECAYS
A$_{FB}({{\boldsymbol K}}{}^{\pm{}}_{{{\boldsymbol \pi}} {{\boldsymbol \mu}} {{\boldsymbol \mu}} }$) = ${\Gamma\mathrm {(cos({{\boldsymbol \theta}}_{ {{\boldsymbol K}} {{\boldsymbol \mu}} })>0)}−\Gamma\mathrm {(cos({{\boldsymbol \theta}}_{ {{\boldsymbol K}} {{\boldsymbol \mu}} })<0)}\over \Gamma\mathrm {(cos({{\boldsymbol \theta}}_{ {{\boldsymbol K}} {{\boldsymbol \mu}} })>0)}+\Gamma\mathrm {(cos({{\boldsymbol \theta}}_{ {{\boldsymbol K}} {{\boldsymbol \mu}} })<0)}}$
INSPIRE search
VALUE
CL%
DOCUMENT ID
TECN
$\bf{<0.023}$
90
1
BATLEY
2011
A
NA48
1
BATLEY 2011A
gives a corresponding value of the asymmetry A$_{FB}$ = $-0.024$ $\pm0.018$.
References:
BATLEY
2011A
PL B697 107
New Measurement of the ${{\mathit K}^{\pm}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ Decay
