[en] The masses of $uuddbar{d}, uudd^{s}$ and $uussbar{d}$ pentaquarks are calculated in the framework of a semirelativistic effective QCD Hamiltonian, but with all auxiliary fields eliminated. The use of a diquark picture allows a correct treatment of the confinement, supposed here to be a Y-junction. With diquark masses fitted on the baryon spectra, ground state pentaquarks are found around 2 GeV
