par Semay, Claude;Brau, Fabian 
;Silvestre-Brac, B.
Référence Physical review letters, 94, 6, 062001
Publication Publié, 2005
;Silvestre-Brac, B.Référence Physical review letters, 94, 6, 062001
Publication Publié, 2005
Article révisé par les pairs
| Résumé : | The masses of pentaquarks uudds 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 uudds̄ 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. |
