Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of the Tau Polarization and its Forward-Backward Asymmetry on
  the Z0   This thesis describes a new a measurement of the tau lepton polarization and
its forward-backward asymmetry at the Z resonance using the OPAL detector. This
measurement is based on analyses of the tau->electron, muon and pion (Kaon)
decays from a sample of 30663 tau-pair events collected in the polar angle
range of Abs(cos(theta)) <0.68 during the 1990-1992 data taking period. Taking
then the Standard Model with the V-A structure of the tau lepton decay, we
measure the average tau polarization to be <p_tau>=(-13.5+/-2.9+/-2.2)% and the
tau polarization forward-backward asymmetry to be AFBpol=(-11.0+/-3.5+/-0.5)%
where the first error is statistical and the second systematic. Combining these
figures with the OPAL <p_tau> and AFBpol measured with the tau->rho channel we
get an average tau polarization, <p_tau>=(-14.9+/-1.9+/-1.3)% and for the
asymmetry in the polarization, AFBpol=(-8.9+/-2.2+/-0.9)% . These results are
consistent with lepton universality. Combining the two results we obtain for
the electroweak mixing angle the value sin^2(theta_W)=0.2331+/-0.0023 within
the context of the Standard Model, where the error includes both statistical
and systematic uncertainties.

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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg