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# Pentaquarks $uudd\bar q$ with one color sextet diquark

Abstract : 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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Journal articles
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http://hal.in2p3.fr/in2p3-00022171
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Submitted on : Thursday, August 26, 2004 - 5:06:39 PM
Last modification on : Thursday, November 19, 2020 - 12:58:39 PM

### Citation

C. Semay, F. Brau, B. Silvestre-Brac. Pentaquarks $uudd\bar q$ with one color sextet diquark. Physical Review Letters, American Physical Society, 2005, 94, 062001 (4 p.). ⟨10.1103/PhysRevLett.94.062001⟩. ⟨in2p3-00022171⟩

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