Determination of quark and gluon vacuum condensates from τ-lepton decay data |
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Authors: | C A Dominguez J Solà |
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Institution: | 1. Deutsches Elektronen-Synchrotron DESY, D-2000, Hamburg, Federal Republic of Germany
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Abstract: | The values of the gluon and four-quark vacuum condensates are estimated using recent experimental data on the semileptonic τ-lepton decays τ→vτ+nπ, which determine the vector and axialvector hadronic spectral functions. An optimal estimate is achieved through a systematic combined use Finite Energy, Laplace and Gaussian transform QCD sum rules. As a byproduct, the values of the dimensiond=8 vacuum condensates in the vector and axial-vector channels are also estimated. |
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