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We show, using the same Lagrangian for the $K_1(1270) to pi K^*_0(1430)$ and $K^*_0(1430) to K_1(1270) pi$ decays, that the present PDG data on the partial decay width of $K_1(1270) to pi K^*_0(1430)$ implies a width for $K^*_0(1430) to K_1(1270) pi$ decay which is about ten times larger than the total $K^*_0(1430)$ width. A discussion on this inconsistency is done, stressing its relationship to the existence of two $K_1(1270)$ states obtained with the chiral unitary theory, which are not considered in the experimental analyses of $Kpipi$ data.
We analyze theoretically the $D^+to u e^+ rho bar K$ and $D^+to u e^+ bar K^* pi$ decays to see the feasibility to check the double pole nature of the axial-vector resonance $K_1(1270)$ predicted by the unitary extensions of chiral perturbation the
By looking at the pseudoscalar-vector meson spectra in the $bar{B}to J/psi rhobar{K}$ and $bar{B}to J/psi bar{K}^*pi$ weak decays, we theoretically investigate the double-pole structure of the $K_1(1270)$ resonance by using the Chiral Unitary approac
Recently the radiative B decay to the strange axial-vector mesons, B --> K1(1270) gamma, has been observed with rather large branching ratio. This process is particularly interesting as the subsequent K1 decay into its three body final state allows u
Measurements of the differential branching fraction and angular moments of the decay $B^0 to K^+ pi^- mu^+ mu^-$ in the $K^+pi^-$ invariant mass range $1330<m(K^+ pi^-)<1530~MeV/c^2$ are presented. Proton-proton collision data are used, corresponding
Using 2.93 fb$^{-1}$ of $e^+e^-$ collision data taken with the BESIII detector at a center-of-mass energy of 3.773 $rm ,GeV$, the observation of the $D^0to K_1(1270)^- e^+ u_e$ semileptonic decay is presented. The statistical significance of the deca