Pentaquark $Θ^+$ in nuclear matter and $Θ^+$ hypernuclei

Details Pentaquark $Θ^+$ in nuclear matter and $Θ^+$ hypernuclei Pentaquark $Θ^+$ in nuclear matter and $Θ^+$ hypernuclei

2004-10-17

arxiv.org/abs/nucl-th/0410072v2

Phys.Rev. C71 (2005) 065208

Physics

Nuclear Physics

Nuclear Theory

16 pages, 5 figures

Scientific paper

10.1103/PhysRevC.71.065208

We study the properties of the $\Theta^+$ in nuclear matter and $\Theta^+$ hypernuclei within the quark mean-field (QMF) model, which has been successfully used for the description of ordinary nuclei and $\Lambda$ hypernuclei. With the assumption that the non-strange mesons couple only to the $u$ and $d$ quarks inside baryons, a sizable attractive potential of the $\Theta^+$ in nuclear matter is achieved as a consequence of the cancellation between the attractive scalar potential and the repulsive vector potential. We investigate the $\Theta^+$ single-particle energies in light, medium, and heavy nuclei. More bound states are obtained in $\Theta^+$ hypernuclei in comparison with those in $\Lambda$ hypernuclei.

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