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, AFB, in bb¯ 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 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 AFB(bb¯)=(1.2±0.7)% at the particle level for b-quark pairs with invariant mass, mbb¯, down to 40 GeV/c2 and measure the dependence of AFB(bb¯) on mbb¯. The results are compatible with expectations from the standard model.

Note:

submitted to Phys. Rev. D

14.65.Fy
anti-p p: colliding beams
angular distribution: asymmetry: measured
anti-p p: scattering
B: semileptonic decay
bottom: pair production
mass spectrum: (bottom anti-bottom)
mass dependence
CDF
Batavia TEVATRON Coll

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