The masses of various pentaquarks $uudd\bar q$ 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, masses of the $\Theta$ and similar pentaquark candidates with positive parity were found around 2.2 GeV. It is shown that, if a color sextet diquark is present, the lowest $uudd\bar q$ pentaquarks are characterized by much smaller masses with a negative parity. Masses below 1.7 GeV are computed, if the masses of the color antitriplet and color sextet diquarks are taken similar.
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机译：使用二夸克图片，在半相对论有效QCD哈密顿量的框架内计算各种五夸克$ uudd \ bar q $的质量。该近似值可以对限制进行正确的处理，在此假定该限制类似于Y形结。仅使用彩色反三重态夸克，在2.2 GeV附近发现了\\ Theta $和类似奇偶校验的五夸克物质的质量。结果表明，如果存在彩色六重双夸克，最低的$ uudd \ bar q $五夸克的特征是质量更小且具有负的奇偶性。如果彩色反三重态和彩色六重态夸克的质量相似，则将计算低于1.7 GeV的质量。
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