ar X iv : h ep - p h / 06 10 21 7 v 3 2 8 Ja n 20 07 Clues for the existence of two K 1 ( 1270 ) resonances
نویسنده
چکیده
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−π+π−p at 63GeV, 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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