Diquarks and Exotic Spectroscopy

Preprint

29 October 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0307341

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

EXOTIC SPECTROSCOPY
CLASSIFICATION
THETA BARYON
BOUND STATE
FOUR QUARKS
DIQUARKS
QUARKS
MATHBF

All Related Versions

Version 1, 2003-07-28, ArXiv
Version 2, 2003-07-28, ArXiv
Version 3, 2003-08-12, ArXiv
Version 4, 2003-10-29, ArXiv
Published version: Physical Review Letters, 91 (23), 232003.

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