TH Seminars

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

by Mr Alejandro Miranda (CINVESTAV IPN, Mexico)

Europe/Madrid
IFAE Virtual Seminar Room (IFAE)

IFAE Virtual Seminar Room

IFAE

https://us02web.zoom.us/j/89787514064?pwd=SkRaOElqanZRNFZXM2d2SE9PN1d0Zz09
Description

We review the isospin-breaking and electromagnetic corrections to the τ⁻ →π⁻ π0 ντ decays, which are used as an input to the two-pion contributions to the hadronic vacuum polarization (at LO) of the anomalous magnetic moment (aμ). We extend previous analyses by Cirigliano et al. working with ChPT with resonances. As an outcome, we improve the agreement between this determination and the other based on e+e- data. The new results are in better agreement with an old estimation that uses Vector Dominance Model (VMD) and thus reduce the discrepancy between the SM prediction and the BNL measurement, soon to be updated by the FNAL Muon g-2 experiment.

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