Diquarks and Exotic Spectroscopy

Preprint

12 August 2003

preprint
Published by arXiv in arXiv

Abstract

We propose that the recently discovered \Theta(1540) baryon is a bound state of four quarks and an antiquark, containing two highly correlated ud-pairs. If so, the \Theta(1540) has positive parity, and it lies in an near-ideally mixed SU(3)_{f} {\bar{10}}_{f} \oplus 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=-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^+(1540) are stable against strong decays.

Keywords

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

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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