Tau decay into ντ and a1(1260), b1(1235), and two K1(1270)

Abstract

We study the τ → ντ A decay, with A an axialvector meson. We produce the a1(1260) and b1(1235) resonances in the Cabibbo favored mode and two K1(1270) states in the Cabibbo suppressed mode. We take advantage of previous chiral unitary approach results where these resonances appear dynamically from the vector and pseudoscalar meson interaction in s-wave. Actually two different poles were obtained associated to the K1(1270) quantum numbers. We find that the unmeasured rates for b1(1235) production are similar to those of the a1(1260) and for the two K1 states we suggest to separate the present information on the K¯ ππ invariant masses into K¯ ∗π and ρK modes, the channels to which these two resonances couple most strongly, predicting that these modes peak at different energies and have different widths. These measurements should shed light on the existence of these two K1 states. In addition, we have gone one step further making a comparison with experimental results of three meson decay channels, letting the vector mesons of our approach decay into pseudoscalars, and we find an overall good agreement with experiment.