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Measurement of the inclusive Z cross section via decays to tau pairs in pp collisions at lass="latex">lass="ss">l">脰s = 7lass="cs">lass="math"> \sqrt {s} = 7 TeV
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摘要
The first measurement of inclusive Z → τ + τ − production in pp collisions at the LHC is presented, in the final states μ + hadrons, e + hadrons, e + μ, and μ + μ. The data sample corresponds to an integrated luminosity of 36 pb−1 collected with the CMS detector. The measured cross section is σ (pp → ZX) 脳 B (Z → τ + τ −) = 1.00 卤 0.05(stat.) 卤 0.08(syst.) 卤 0.04(lumi.)nb, which is in good agreement with the next-to-next-to-leading order QCD prediction and improves on previous measurements in the Z → e+e− and μ + μ − channels. The reconstruction efficiency for hadronic τ decays is determined with a precision of 7%.

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