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Author  |
Lopez Castro, G.; Miranda, A.; Roig, P. |
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Title |
Isospin breaking corrections in 2π production in tau decays and e plus e – annihilation: Consequences for the muon g -2 and conserved vector current tests |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
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Volume |
111 |
Issue |
7 |
Pages |
073004 - 26pp |
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Abstract |
We revisit the isospin-breaking corrections relating the e+e- hadronic cross section and the tau decay spectral function, focusing on the dipion channel, that gives the dominant contribution to the hadronic vacuum polarization piece of the muon g – 2. We test different types of electromagnetic and weak form factors and show that both, the Gounaris-Sakurai and a dispersive-based approach, describe accurately z lepton and e+e- data (less when KLOE measurements are included in the fits) and comply reasonably well with analyticity constraints. From these results we obtain the isospin-breaking contribution to the conserved vector current (CVC) prediction of the BR(z -> vz) and to the 2hadronic vacuum polarization (HVP) contribution to the muon g – 2, in agreement with previous determinations and with similar precision. Our results abound in the utility of using tau data-based results in the updated data-driven prediction of the muon g – 2 in the Standard Model. |
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Address |
[Castro, Gabriel Lopez; Roig, Pablo] Ctr Invest & Estudios Avanzados IPN, Dept Fis, Apartado Postal 14-740, Ciudad De Mexico 07000, Mexico, Email: gabriel.lopez@cinvestav.mx; |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
Summary Language |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
2470-0010 |
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Notes |
WOS:001501327400018 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6703 |
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