1212.1534 (G. Calderon et al.)

Axial-vector mesons from $τ\to APν_τ$ decays    [PDF]

G. Calderon, J. H. Munoz, C. E. Vera

Axial-vector mesons $a_1(1260)$, $f_1(1285)$, $h_1(1170)$, $K_1(1270)$ and $K_1(1400)$ can be produced in semileptonic $\tau\to A P \nu_{\tau}$ decays, where $P$ stands for the pseudoscalar mesons $\pi$ or $K$. We calculate the branching ratios based in a meson dominance model. The exclusive channels $\tau^-\to a_1(1260)^-\pi^0\nu$, $\tau^-\to a_1(1260)^0\pi^-\nu$, $\tau^-\to f_1(1285)\pi^-\nu$ and $\tau^-\to h_1(1170)\pi^-\nu$ turn out to be of order ${\cal O}(10^{-4})$ and channels $\tau^-\to K_1(1270)^-\pi^0\nu$, $\tau^-\to K_1(1270)^0\pi^-\nu$, $\tau^-\to K_1(1400)^-\pi^0\nu$ and $\tau^-\to K_1(1400)^0\pi^-\nu$ of order ${\cal O}(10^{-6})$. These results indicate that the branching ratios could be measured in experiments.

View original: http://arxiv.org/abs/1212.1534