Pentaquark Θ+(1540) in the string model
Abstract
We consider the Θ+(1540) pentaquark in the string model that correctly reproduces the linear Regge trajectories for the case of orbtal excitations of light qq¯ mesons and qqq baryons. Assuming (and arguing in favor of) the diquark-antiquark-diquark ([ud]s¯[ud]) clustering of this orbitally excited object we found its mass about 290MeV above the experimental value 1540MeV. In the model considered this discrepancy could be attributed to the change of the constituent mass of s¯ antiquark as compared to that of s quark localized at the string end.
- Publication:
-
Physical Review D
- Pub Date:
- January 2005
- DOI:
- 10.1103/PhysRevD.71.017502
- arXiv:
- arXiv:hep-ph/0502021
- Bibcode:
- 2005PhRvD..71a7502M
- Keywords:
-
- 12.38.Lg;
- 12.39.Mk;
- 12.40.Yx;
- Other nonperturbative calculations;
- Glueball and nonstandard multi-quark/gluon states;
- Hadron mass models and calculations;
- High Energy Physics - Phenomenology
- E-Print:
- 4 pages, 5 figures