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Recent studies based on unitary chiral perturbation theory (U$\chi$PT) foundthat the low-lying axial vector mesons can be dynamically generated due to theinteraction of the pseudoscalar octet of the pion and the vector nonet of therho. In particular, two poles in the second Riemann sheet have been associatedto the nominal $K_1(1270)$ resonance. In this talk, we present a recentanalysis of the WA3 data on $K^-p\to K^-\pi^+\pi^- p$ at 63 GeV using theU$\chi$PT amplitudes, and show that it is in favor of the existence of two$K_1(1270)$'s [Phys. Rev. D 75, 014017 (2007)].

The WA3 data and the two $K_1(1270)$ resonances