Figure 5

(Top) Forward-to-backward ratio $R_{\rm FB}$ of inclusive $\Upsilon$(1S) yields compared to the J/$\psi$ $R_{\rm FB}$. The vertical error bars represent the statistical uncertainties and the open boxes the uncorrelated systematic uncertainties.
(Bottom) Inclusive $\Upsilon$(1S) $R_{\rm FB}$ compared to theoretical model calculations. The statistical and systematic uncertainties for the experimental value are added in quadrature. For the calculations, uncertainties are quoted when available.