Clues for the existence of two $K_1(1270)$ resonances

Details Clues for the existence of two $K_1(1270)$ resonances Clues for the existence of two $K_1(1270)$ resonances

2006-10-17

arxiv.org/abs/hep-ph/0610217v3

Phys.Rev.D75:014017,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

published version in PRD; typos corrected; title changed to "Clues for the existence of two $K_1(1270)$ resonances"

Scientific paper

10.1103/PhysRevD.75.014017

The axial vector meson $K_1(1270)$ 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 $K^- p\to K^-\pi^+\pi^- p$ at 63 GeV, which established the existence of both $K_1(1270)$ and $K_1(1400)$, 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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