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- W2009879725 abstract "An analysis based on 124 000 selected τ pairs recorded by the ALEPH detector at LEP provides the vector (V) and axial-vector (A) spectral functions of hadronic τ decays. The spectral functions of the dominant two-and four-pion vector τ decay modes are compared to published results of e+e− annihilation experiments applying isospin symmetry. A precise measurement of αs along with a determination of nonperturbative contributions at the τ mass scale is performed. The experimentally and theoretically most robust determination of αs(Mτ2) is obtained from the (V + A) fit that yields αs(Mτ2) = 0.334 ± 0.022 giving αs(MZ2) = 0.1202 ± 0.0027 after the extrapolation to the mass of the Z boson. In addition, the approach of the Operator Product Expansion (OPE) is tested experimentally by studying the evolution of the τ hadronic widths to masses smaller than the τ mass. An analysis based on finite energy chiral sum rules provides a precise determination of the L10 constant of the chiral lagrangian." @default.
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- W2009879725 date "1999-04-01" @default.
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- W2009879725 title "τ Spectral functions, QCD applications and chiral sum rules" @default.
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- W2009879725 doi "https://doi.org/10.1016/s0920-5632(99)00483-1" @default.
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