Measurement of the forward-backward asymmetry in low-mass bottom-quark   pairs produced in proton-antiproton collisions
  We report a measurement of the forward-backward asymmetry, $A_{FB}$, in $b\bar{b}$ pairs produced in proton-antiproton collisions and identified by muons from semileptonic $b$-hadron decays. The event sample was collected at a center-of-mass energy of $\sqrt{s}=1.96$ TeV with the CDF II detector and corresponds to 6.9 fb$^{-1}$ of integrated luminosity. We obtain an integrated asymmetry of $A_{FB}(b\bar{b})=(1.2 \pm 0.7)$\% at the particle level for $b$-quark pairs with invariant mass, $m_{b\bar{b}}$, down to $40$ GeV/$c^2$ and measure the dependence of $A_{FB}(b\bar{b})$ on $m_{b\bar{b}}$. The results are compatible with expectations from the standard model. 
CDF Collaboration: T. Aaltonen, S. Amerio, D. Amidei, A. Anastassov,   A. Annovi, J. Antos, G. Apollinari, J.A. Appel, T. Ar...
hep-ex