Abstract: We report a measurement of the forward-backward asymmetry, AFB, in b¯b pairs produced in proton-antiproton collisions and identified by muons from semileptonic b-hadron decays. The event sample is collected at a center-of-mass energy of vs=1.96??TeV with the CDF II detector and corresponds to 6.9??fb-1 of integrated luminosity. We obtain an integrated asymmetry of AFB(b¯b)=(1.2±0.7)% at the particle level for b-quark pairs with invariant mass, mb¯b, down to 40??GeV/c2 and measure the dependence of AFB(b¯b) on mb¯b. The results are compatible with expectations from the standard model.

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