Precision tests via radiative $\mu$ and $\tau$ leptonic decays
| Autor: | Fael, M., Passera, M. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The branching fractions of radiative leptonic $\tau$ decays $(\tau \to l \nu \bar{\nu} \gamma$, $l=e,\mu)$ were recently measured by the Babar collaboration with a relative error of about 3%. The measurement of the branching ratio $\mathcal{B} (\tau \to e \bar{\nu} \nu \gamma)$, for a minimum photon energy of 10 MeV in the $\tau$ rest frame, differs from our recent SM prediction by 3.5 standard deviations, whereas our result agrees with Babar's value for $\mathcal{B} (\tau \to \mu \bar{\nu} \nu \gamma)$. Our predictions also agree with the measurement of $\mathcal{B} (\mu \to e \bar{\nu} \nu \gamma)$ by the MEG collaboration. We also report on a recent proposal to test the $\tau$ dipole moments via precise measurements of radiative leptonic $\tau$ decays at high-luminosity $B$ factories. Comment: 10 pages, 1 figure, to appear in the proceedings of the 12th International Symposium on Radiative Corrections (Radcor 2015) and LoopFest XIV (Radiative Corrections for the LHC and Future Colliders) |
| Databáze: | arXiv |
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