On the problem of isodoublet of 1 3P 1 meson state

In the framework of meson-meson mass mixing, we investigate the mass of isodoublet of the 1 3P 1 meson nonet in the presence of a 1(1260), f 1(1285) and f 1(1420) being the 1 3P 1 meson state and the decays of the states f 1(1285) and f 1(1420). The results are in agreement with the values predicted by other theoretical approaches and the experimental data. As a byproduct, with the help of the mass of isodoublet of the 1 3P 1 meson nonet, we obtain the mixing angle between the K 1(1270) and K 1(1400) mesons. Our results should be tested in the experiment in the future. © 2012 IACS.