Abstract
We perform an effective field theory analysis of the τ− → π−π0ντ decays, that includes the most general interactions between Standard Model fields up to dimension six, assuming left-handed neutrinos. We constrain as much as possible the necessary Standard Model hadronic input using chiral symmetry, dispersion relations, data and asymptotic QCD properties. As a result, we show that it is possible to set precise (competitive with low-energy and LHC measurements) bounds on (non-standard) charged current tensor interactions, finding a very small preference for their presence, according to Belle data. Belle-II near future measurements can thus be very useful in either confirming or further restricting new physics tensor current contributions to these decays. For this, the spectrum in the di-pion invariant mass turns out to be particularly promising. Distributions in the angle defined by the τ− and π− momenta can also be helpful if measured with less than 10% accuracy, both for non-standard scalar and tensor interactions.
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Miranda, J.A., Roig, P. Effective-field theory analysis of the τ− → π−π0ντ decays. J. High Energ. Phys. 2018, 38 (2018). https://doi.org/10.1007/JHEP11(2018)038
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DOI: https://doi.org/10.1007/JHEP11(2018)038