Confronting spectral functions from e+e− annihilation and τ decays: Consequences for the muon magnetic moment
نویسندگان
چکیده
منابع مشابه
Confronting Spectral Functions from ee Annihilation and τ Decays: Consequences for the Muon Magnetic Moment
Vacuum polarization integrals involve the vector spectral functions which can be experimentally determined from two sources: (i) e+e− annihilation cross sections and (ii) hadronic τ decays. Recently results with comparable precision have become available from CMD-2 on one side, and ALEPH, CLEO and OPAL on the other. The comparison of the respective spectral functions involves a correction from ...
متن کاملConfronting Spectral Functions from e+e− Annihilation and τ Decays: Consequences for the Muon Magnetic Moment
Vacuum polarization integrals involve the vector spectral functions which can be experimentally determined from two sources: (i) ee annihilation cross sections and (ii) hadronic τ decays. Recently results with comparable precision have become available from CMD-2 on one side, and ALEPH, CLEO and OPAL on the other. The comparison of the respective spectral functions involves a correction from is...
متن کاملUpdated Estimate of the Muon Magnetic Moment Using Revised Results from ee Annihilation
A new evaluation of the hadronic vacuum polarization contribution to the muon magnetic moment is presented. We take into account the reanalysis of the low-energy ee annihilation cross section into hadrons by the CMD-2 Collaboration. The agreement between ee and τ spectral functions in the ππ channel is found to be much improved. Nevertheless, significant discrepancies remain in the center-of-ma...
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We discuss the decay τ − → ν τ π − π 0 γ in terms of a model with the correct low-energy structure and with the relevant resonance degrees of freedom. The nontrivial radiative dynamics becomes visible for large photon momenta only. We use the model to calculate electromagnetic corrections for the two-pion contribution to hadronic vacuum polarization extracted from photon-inclusive two-pion deca...
متن کاملSpectral Functions from Hadronic τ Decays and QCD
Hadronic decays of the τ lepton provide a clean environment to study hadron dynamics in an energy regime dominated by resonances, with the interesting information captured in the spectral functions. Recent results from ALEPH on exclusive channels are presented, with some emphasis on the ππ final state which plays a crucial role for the determination of the hadronic contribution to the muon anom...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2003
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(03)02179-0