Diquark and light four-quark states
| dc.creator | Zhang, Ailin | |
| dc.creator | Huang, Tao | |
| dc.creator | Steele, T. G. | |
| dc.date | 2006-12-12 | |
| dc.date | 2007-07-12 | |
| dc.date.accessioned | 2026-07-07T11:02:22Z | |
| dc.date.available | 2026-07-07T11:02:22Z | |
| dc.description | Four-quark states with different internal clusters are discussed within the constituent quark model. It is pointed out that the diquark concept is not meaningful in the construction of a tetraquark interpolating current in the QCD sum rule approach, and hence existing sum-rule studies of four-quark states are incomplete. An updated QCD sum-rule determination of the properties of diquark clusters is then used as input for the constituent quark model to obtain the masses of light $0^{++}$ tetraquark states ({\it i.e.\} a bound state of two diquark clusters). The results support the identification of $σ(600)$, $f_0(980)$ and $a_0(980)$ as the $0^{++}$ light tetraquark states, and seem to be inconsistent with the tetraquark state interpretation of the new BES observations of the near-threshold $p\bar p$ enhancements, X(1835) and X(1812), with the possible exception that X(1576) may be an "exotic" first orbital excitation of $f_0(980)$ or $a_0(980)$. | |
| dc.description | 7 pages, 4 eps figures, RevTex, two figures and some references added, published version in PRD | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0612146 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0612146 | |
| dc.identifier | Phys.Rev.D76:036004,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.036004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/188232 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Diquark and light four-quark states | |
| dc.type | text |