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- W1490497114 abstract "The resonancelike signal with axial-vector quantum numbers ${J}^{PC}={1}^{++}$ at a mass of 1420 MeV and a width of 140 MeV, recently observed by the COMPASS and VES experiments in the ${f}_{0}(980)ensuremath{pi}$ final state and tentatively called ${a}_{1}(1420)$, is discussed. Instead of a genuine new meson, we interpret this signal as a dynamical effect due to a singularity (branching point) in the triangle diagram formed by the processes ${a}_{1}(1260)ensuremath{rightarrow}{K}^{ensuremath{star}}overline{K}$, ${K}^{ensuremath{star}}ensuremath{rightarrow}Kensuremath{pi}$, and $Koverline{K}ensuremath{rightarrow}{f}_{0}(980)$ ($+mathrm{c}.mathrm{c}$). The amplitude for this diagram is calculated. The result exhibits a peak in the intensity with a sharp phase motion with respect to the dominant ${a}_{1}(1260)ensuremath{rightarrow}ensuremath{rho}ensuremath{pi}$ $S$-wave decay, in good agreement with the data. The branching ratio of ${a}_{1}(1260)ensuremath{rightarrow}{f}_{0}(980)ensuremath{pi}$ via the triangle diagram is estimated and compared to the dominant decay ${a}_{1}(1260)ensuremath{rightarrow}ensuremath{rho}ensuremath{pi}$." @default.
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- W1490497114 date "2015-05-14" @default.
- W1490497114 modified "2023-09-25" @default.
- W1490497114 title "Nature of the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>a</mml:mi><mml:mn>1</mml:mn></mml:msub><mml:mo stretchy=false>(</mml:mo><mml:mn>1420</mml:mn><mml:mo stretchy=false>)</mml:mo></mml:math>" @default.
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- W1490497114 doi "https://doi.org/10.1103/physrevd.91.094015" @default.
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