Pentaquarks $uudd\bar q$ with One Color Sextet Diquark

Details Pentaquarks $uudd\bar q$ with One Color Sextet Diquark Pentaquarks $uudd\bar q$ with One Color Sextet Diquark

2004-08-20

arxiv.org/abs/hep-ph/0408225v2

Phys.Rev.Lett. 94 (2005) 062001

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevLett.94.062001

The masses of pentaquarks $uudd\bar s$ 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 $\Theta$ with positive parity is found around 2.2 GeV. It is shown that, if a color sextet diquark is present, the lowest $uudd\bar s$ 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.

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