A search for the exotic meson X(5568) decaying into the B_{s}^{0}π^{±} final state is performed using data corresponding to 9.6 fb^{-1} from pp[over ¯] collisions at sqrt[s]=1960 GeV recorded by the Collider Detector at Fermilab. No evidence for this state is found and an upper limit of 6.7% at the 95% confidence level is set on the fraction of B_{s}^{0} produced through the X(5568)→B_{s}^{0}π^{±} process.
We measure the particle-level forward-backward production asymmetry in bb pairs with masses (m bb ) larger than 150 GeV=c 2 , using events with hadronic jets and employing jet charge to distinguish b fromb. The measurement uses 9.5 fb −1 of pp collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m bb is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV=c 2 , whereas a model containing a heavier 345 GeV=c 2 axigluon is not excluded.
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