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- W2017494996 abstract "The forward-backward asymmetry of $$e^ + e^ - to Z^0 to bbar b$$ has been measured using approximately 2.15 million hadronicZ 0 decays collected at the LEP e+e− collider with the OPAL detector. A lifetime tag technique was used to select an enriched $$bbar b$$ event sample. The measurement of the $$bbar b$$ asymmetry was then performed using a jet charge algorithm to determine the direction of the primary quark. Values of: $$begin{gathered} A_{FB}^b = 0.062 pm 0.034 pm 0.002 - 0.082Delta (Gamma _{bbar b} /Gamma _{had} ) hfill atsqrt s = 89.52GeV, hfill A_{FB}^b = 0.0963 pm 0.0067 pm 0.0038 - 0.471Delta (Gamma _{bbar b} /Gamma _{had} ) hfill atsqrt s = 91.25GeV, hfill A_{FB}^b = 0.172 pm 0.028 pm 0.007 - 0.055Delta (Gamma _{bbar b} /Gamma _{had} ) hfill atsqrt s = 92.94GeV, hfill end{gathered}$$ were measured where, in each case, the first error is statistical, the second is systematic and the third term gives the variation due to a change $$Delta (Gamma _{bbar b} /Gamma _{had} )$$ in the value of $$Gamma _{bbar b} /Gamma _{had} = 0.216$$ assumed. The dependence on the assumed charm asymmetry at the same energy is Δ(A FB b )≈+0.07Δ(A FB c ). Assuming the Standard Model form for the couplings, these measurements correspond to an effective weak mixing angle of: $$sin ^2 theta _W^{eff,e} = 0.2313 pm 0.0012 pm 0.0006$$ giving Mtop=196 −38−19 +33+16 GeV/c 2, where the first error is statistical and the second is systematic. The Higgs mass assumed is 300 GeV/c 2. A variation in the assumed mass of the Higgs boson between 60 and 1000 GeV/c 2 corresponds to an uncertainty in sin2θ W eff,e of ±0.00006 and on Mtop of −26 +20 GeV/c 2." @default.
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