Generalized structure functions are derived for tau decays including tensor beyond-SM contributions, enabling maximal model-independent use of data for CP/T violation studies.
Chiral Perturbation Theory with tensor sources
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abstract
We construct the most general chirally-invariant Lagrangian for mesons in the presence of external sources coupled to the tensor current \bar{\psi}\sigma_{\mu\nu}\psi. In order to have only even terms in the chiral expansion, we consider the new source of O(p^2). With this choice, we build the even-parity effective Lagrangian up to the p^6-order (NLO). While there are only 4 new terms at the p^4-order, at p^6-order we find 78 terms for n_f=2 and 113 terms for n_f=3. We provide a detailed discussion on the different mechanisms that ensure that our final set of operators is complete and non-redundant. We also examine the odd-parity sector, to conclude that the first operators appear at the p^8-order (NNLO).
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hep-ph 2representative citing papers
The forward-backward asymmetry in τ⁻ → ω π⁻ ν_τ decay provides a sensitive probe for non-standard tensor interactions in resonance chiral theory.
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Generalized structure functions in semileptonic tau decays
Generalized structure functions are derived for tau decays including tensor beyond-SM contributions, enabling maximal model-independent use of data for CP/T violation studies.
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$\tau^- \to \omega \pi^- \nu_\tau$ decay in R$\chi$T with tensor sources
The forward-backward asymmetry in τ⁻ → ω π⁻ ν_τ decay provides a sensitive probe for non-standard tensor interactions in resonance chiral theory.