Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-03-09
Mod.Phys.Lett. A19 (2004) 2791-2797
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1142/S0217732304015154
Using the picture of the flux tube model, we propose that the $\Theta_5$ pentaquark as the first candidate of the three-dimensional non-planar hadron with the extremely stable diamond structure. The up and down quarks lie at the corners of the diamond while the anti-strange quark sits in the center. Various un-excited color flux tubes between the five quarks bind them into a stable and narrow color-singlet. Such a configuration allows the lowest state having the negative parity naturally. The decay of the $\Theta_5$ pentaquark into the nucleon and kaon requires the breakup of the non-planar diamond configuration into two conventional planar hadrons, which involves some kind of structural phase transition as in the condensed matter physics. Hence the width of the $\Theta^+$ pentaquark should be narrow despite that it lies above the kaon nucleon threshold. We suggest that future lattice QCD calculation adopt non-planar interpolating currents to explore the underlying structure of the $\Theta_5$ pentaquark.
Song Xing-Chang
Zhu Shi-Lin
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