Clues for the existence of two K-1(1270) resonances

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2007
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The axial-vector meson K1(1270) was studied within the chiral unitary approach, where it was shown that it has a two-pole structure. We reanalyze the high-statistics WA3 experiment K-p-->K-pi+pi-p at 63 GeV, which established the existence of both K1(1270) and K1(1400), and we show that it clearly favors our two-pole interpretation. We also reanalyze the traditional K-matrix interpretation of the WA3 data and find that the good fit of the data obtained there comes from large cancellations of terms of unclear physical interpretation.
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Geng, Li Sheng Oset Báguena, Eulogio Roca Zamora, Luis Oller Berber, José Antonio 2007 Clues for the existence of two K-1(1270) resonances Physical Review D 75 1 014017
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