Publication: Tau decay into a pseudoscalar and an axial-vector meson
Authors
Dai, L.R. ; Roca Zamora, Luis ; Oset, E.
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Publisher
American Physical Society
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DOI
https://doi.org/10.1103/PhysRevD.99.096003
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info:eu-repo/semantics/article
Description
© 2019, American Physical Society. This document is the Published version of a Published Work that appeared in final form in Physical Review D. To access the final edited and published work see https://doi.org/10.1103/PhysRevD.99.096003
Abstract
We study theoretically the decay τ− → ντP−A, with P− a π− or K− and A an axial-vector resonance b1(1235), h1(1170), h1(1380), a1(1260), f1(1285) or any of the two poles of the K1(1270). The process proceeds through a triangle mechanism where a vector meson pair is first produced from the weak current and then one of the vectors produces two pseudoscalars, one of which reinteracts with the other vector to produce the axial resonance. For the initial weak hadronic production we use a recent formalism to account for the hadronization after the initial quark-antiquark pair produced from the weak current, which explicitly filters G-parity states and obtain easy analytic formulas after working out the angular momentum algebra.
The model also takes advantage of the chiral unitary theories to evaluate the vector-pseudoscalar (VP) amplitudes, where the axial-vector resonances were obtained as dynamically generated from the vectorpseudoscalar interaction. We make predictions for invariant mass distribution and branching ratios for the channels considered.
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Citation
Phys. Rev. D 99, 096003 (2019)
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