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We have investigated negative-parity uudd\bar{s} pentaquarks by employing aquark model with the meson exchange and the effective gluon exchange as qq andq\bar{q} interactions. The system for the five quarks is dynamically solved;the effects of qq and q\bar{q} correlations on the wave function are taken intoaccount.  It is found that the masses of the pentaquarks are reasonably low. Thelowest-mass state is found to be TJ^P=0{1/2}^-, and the next lowest one is0{3/2}^-. The former is reported to have a large width. We argue the observednarrow peak corresponds to the latter state. It is still necessary to introducean extra attraction to reduce the mass further by 140 -- 280 MeV to reproducethe observed \Theta^+ mass. Since their level splitting is found to be lessthan 80 MeV, the lower level will not become a bound state below the NKthreshold even after such an attraction is introduced.  It is also found that the relative distance of two quarks with the attractiveinteraction is found to be by about 1.2 -- 1.3 times closer than that of therepulsive one. The two-body correlation seems important in the pentaquarksystems.Comment: 5 pages, no figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Pentaquark as a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi mathvariant="italic">NK</mml:mi><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>bound state with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>T</mml:mi><mml:msup><mml:mi>J</mml:mi><mml:mrow><mml:mi>P</mml:mi></mml:mrow></mml:msup><mml:mo>=</mml:mo><mml:mn>0</mml:mn><mml:msup><mml:mfrac><mml:mrow><mml:mn>3</mml:…

Pentaquark as aNK*bound state withTJP=03