Diquarks and Exotic Spectroscopy
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0307341,
title = {Diquarks and Exotic Spectroscopy},
author = {R. L. Jaffe and F. Wilczek},
journal= {arXiv preprint arXiv:hep-ph/0307341},
year = {2009}
}
Comments
5 pages, 2 figures, revtex 4, minor corrections and revisions for journal publication