Phys. Rev. Lett. 94, 062001 (2005) [4 pages]Pentaquarks uudds̅ with One Color Sextet DiquarkReceived 20 August 2004; published 18 February 2005 The masses of pentaquarks uudds̅ are calculated within the framework of a semirelativistic effective QCD Hamiltonian using a diquark picture. This approximation allows a correct treatment of the confinement, assumed here to be similar to a Y junction. With only color antitriplet diquarks, the mass of the pentaquark candidate Θ with positive parity is found around 2.2 GeV. It is shown that, if a color sextet diquark is present, the lowest uudds̅ pentaquark is characterized by a much smaller mass with a negative parity. A mass below 1.7 GeV is computed if the masses of the color antitriplet and color sextet diquarks are taken similar. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.062001
DOI:
10.1103/PhysRevLett.94.062001
PACS:
12.39.Pn, 12.39.Ki, 14.20.–c
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