Measurement of the Leptonic Asymmetry in $t \bar t$ Events Produced in $p \bar p$ Collisions at $\sqrt s=$ 1.96  TeV

We measure the asymmetry in the charge-weighted rapidity qyℓ of the lepton in semileptonic tt¯ decays recorded with the CDF II detector using the full Tevatron Run II sample, corresponding to an integrated luminosity of 9.4 fb-1. A parametrization of the asymmetry as a function of qyℓ is used to correct for the finite acceptance of the detector and recover the production-level asymmetry. The result of AFBℓ=0.094-0.029+0.032 is to be compared to the standard model next-to-leading-order prediction of AFBℓ=0.038±0.003.

14.65.Ha
11.30.Er
12.38.Qk
13.85.Qk
top: pair production
lepton: rapidity
higher-order: 1
angular distribution: asymmetry
Batavia TEVATRON Coll
parametrization

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[25]

S (qy ) and A (qy ) represent the continuous symmetric part and asymmetry. AFB (qy ) and S (qy ) are the binned equivalents of these continuous distributions. Simulated samples have very high statistics and may be binned finely enough to be treated as essentially continuous, and so are represented with A (qy ) and S (qy )

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Measurement of the Leptonic Asymmetry in ttˉt \bar tttˉ Events Produced in ppˉp \bar pppˉ​ Collisions at s=\sqrt s=s​= 1.96 TeV

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Measurement of the Leptonic Asymmetry in $t \bar t$ Events Produced in $p \bar p$ Collisions at $\sqrt s=$ 1.96 TeV