Second-class current effects from isospin breaking in tau-->omega pi nu_tau

Abstract

Second-class weak currents can in the standard model be induced by chiral symmetry breaking. In the specific case of the decay tau-->omega pi nu_tau, dominated by the first-class vector current with the rho quantum numbers, such effects would manifest themselves by small axial vector (or, generally, non-vector) contributions to the decay rate. We present an attempt to estimate such effects, based on a vector and axial-vector dominance model of the relevant matrix elements supplemented by omega-rho mixing. We also give an indication on the amplitude directly mediated by b_1(1235)-->omega pi, in principle also allowed in the standard model by isotopic spin violation.

8 pages, revtex

References in corpus (6)

• tau -> pi pi pi nu_tau decays and the a_1(1260) off-shell width revisited
• Study of tau- --> V P- nu(tau) in the framework of resonance chiral theory
• Consequences of the BaBar e^+e^- --> pi^+pi^- Measurement for the Determination of Model-Dependent rho-omega Mixing Effects in Pi_{ρω}(m_ρ^2) and (g-2)_mu
• On meson dominance in the `second class' tau \to eta pi nu_tau decay
• On the branching ratio of the "second class" tau --> eta' pi nu_tau decay
• (ω, ϕ) P^- decays of tau leptons

Cited by in corpus (5)

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• The $2_1^{+}\to 3_1^{+}$ gamma width in ${}^{22}$Na and second class currents
• Superfactory of bottomed hadrons Belle II
• The $\rho (770,1450)\to \omega \pi$ contributions for three-body decays $B\to {\bar{D}}^{(\ast )}\omega \pi$
• Contributions of $\rho (770,1450)\to \omega \pi$ for the Cabibbo-favored $D\to h\omega \pi$ decays