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| Paper IPM / P / 15090 |
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| Abstract: | |||||||
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The structure, spectroscopic parameters and width of the resonance with quantum numbers
JPC=1++ discovered by the COMPASS Collaboration and classified as
the a1(1420) meson are examined in the context of QCD sum rule
method. In the calculations the axial-vector meson a1(1420) is
treated as a four-quark state with the diquark-antidiquark structure. The
mass and current coupling of a1(1420) are evaluated using QCD two-point
sum rule approach. Its observed decay mode a1(1420) → f0(980)π, and
kinematically allowed ones, namely a1 → K∗±K±, a1 →K∗0 ―K0 and a1 → ―K∗0 K0 channels are
studied employing QCD sum rules on the light-cone. Our prediction for the
mass of the a1(1420) state ma1=1416−79+81 MeV is
in excellent agreement with the experimental result. Width of this state Γ = 145.52 ±20.79 MeV within theoretical and experimental
errors is also in accord with the COMPASS data.
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