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New τ -based evaluation of the hadronic contribution to the vacuum polarization piece of the muon anomalous magnetic moment

Miranda, J. A. ; Roig, P.

Physical review. D, 2020-12, Vol.102 (11), Article 114017 [Periódico revisado por pares]

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Título:
New τ -based evaluation of the hadronic contribution to the vacuum polarization piece of the muon anomalous magnetic moment
Autor: Miranda, J. A. ; Roig, P.
Assuntos: Decay ; Magnetic moments ; Muons ; Pions ; Polarization ; Standard model (particle physics)
É parte de: Physical review. D, 2020-12, Vol.102 (11), Article 114017
Descrição: We revisit the isospin-breaking and electromagnetic corrections to the decay τ− → π−π0ντ, which allow its use as input in the two-pion contribution to the (leading-order) hadronic vacuum polarization part of the muon anomalous magnetic moment. We extend a previous resonance chiral Lagrangian analysis, which included those operators saturating the next-to-leading-order chiral low-energy constants, by including the contributions appearing at the next order. As a result, we improve agreement between the two-pion tau decay and e+e− data and reduce the discrepancy between experiment and the Standard Model prediction of aμ (using τ input) to the approximately 2σ level.
Editor: College Park: American Physical Society
Idioma: Inglês

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