Diquarks and Exotic Spectroscopy

Details Diquarks and Exotic Spectroscopy Diquarks and Exotic Spectroscopy

2003-07-28

arxiv.org/abs/hep-ph/0307341v4

Phys.Rev.Lett. 91 (2003) 232003

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 2 figures, revtex 4, minor corrections and revisions for journal publication

Scientific paper

10.1103/PhysRevLett.91.232003

We propose that the recently discovered \Theta baryon is a bound state of four quarks and an antiquark, containing two highly correlated ud-pairs. If so, the \Theta baryon has positive parity, and it lies in an near-ideally mixed SU(3)_{f} \mathbf{\bar{10}}_{f} oplus \mathbf{8}_{f}. The Roper resonance and the P_{11}(1710) fit naturally into this classification. We predict an isospin 3/2 multiplet of \Xi's (S=-2) with J^{\Pi}=\half^{+} around 1750 MeV. A search for manifestly exotic \Xi^{+} and \Xi^{--} in this mass range could provide a sharp test of our proposal. We predict that charm and bottom analogues of the \Theta baryon are stable against strong decays.

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