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FORWARD-BACKWARD ASYMMETRIES

The forward-backward assymmetry is defined as A$_{FB}({{\mathit \Lambda}_{{b}}^{0}}$) = [ N(F) $−$ N(B)] $/$ [N(F) + N(B) ], where the forward (F) direction corresponds to a particle (${{\mathit \Lambda}_{{b}}^{0}}$ or ${{\mathit \Lambda}_{{b}}^{-}}$) sharing valence quark flavors with a beam particle with the same sign of rapidity.

$\Delta (A{}^{{{\mathit \ell}}}_{FB}$( ${{\mathit \mu}}{{\mathit \mu}}$ )) in ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$

INSPIRE   PDGID:

S040A21

Difference of asymmetries A${}^{{{\mathit \ell}}}_{FB}$( ${{\mathit \mu}}{{\mathit \mu}}$ ) in ${{\mathit \Lambda}_{{b}}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ between ${{\mathit \Lambda}_{{b}}}$ and ${{\overline{\mathit \Lambda}}_{{{b}}}}$ decays

VALUE DOCUMENT ID TECN  COMMENT $-0.05$ $\pm0.09$ $\pm0.03$ AAIJ 2018 AO LHCB ${{\mathit p}}{{\mathit p}}$ at 7, 8 TeV

References:

AAIJ 2018AO JHEP 1809 145 (errat.) Differential branching fraction and angular analysis of $\Lambda^{0}_{b} \rightarrow \Lambda \mu^+\mu^-$ decays

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