Prediction of Narrow $J^π=1/2^+$, $3/2^+$, and $3/2^-$ states of $Θ_+$ in a Quark model with Antisymmetrized Molecular Dynamics

Details Prediction of Narrow $J^π=1/2^+$, $3/2^+$, and $3/2^-$ states of $Θ_+$ in a Quark model with Antisymmetrized Molecular Dynamics Prediction of Narrow $J^π=1/2^+$, $3/2^+$, and $3/2^-$ states of $Θ_+$ in a Quark model with Antisymmetrized Molecular Dynamics

2004-04-17

arxiv.org/abs/hep-ph/0404144v4

Phys.Rev. C71 (2005) 045202

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 2 figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevC.71.045202

The exotic baryon $\Theta^+(uudd\bar{s})$ is studied with microscopic calculations in a quark model by using a method of antisymmetrized molecular dynamics. We predict that the lowest even state is $J^\pi=1/2^+(I=0)$ or $J^\pi=3/2^+(I=0)$, and the lowest odd state is $J^\pi=3/2^-(I=1)$. They nearly degenerate in the $uudd\bar{s}$ system. We discuss $K^+n$ decay widths and estimate them to be $\Gamma< 7$ for the $J^\pi=\{1/2^+,3/2^+\}$, and $\Gamma<1$ MeV for the $J^\pi=3/2^-$ state.

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