ar X iv : h ep - p h / 03 07 34 1 v 2 2 8 Ju l 2 00 3 Diquarks and Exotic Spectroscopy
نویسنده
چکیده
We propose that the recently discovered Θ(1540) baryon is a bound state of four quarks and an antiquark, containing two highly correlated ud-pairs. If so, the Θ(1540) has positive parity, and it lies in an near-ideally mixed SU(3)f 10f ⊕8f . The Roper resonance and the P11(1710) fit naturally into this classification. We predict an isospin 3/2 multiplet of Ξ’s (S = −2) with J = 1 2 + around 1750 MeV. A search for manifestly exotic Ξ and Ξ−− in this mass range could provide a sharp test of our proposal.
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