Artículos de revistas
A QCD sum rule study of Theta(+) in nuclear matter
Fecha
2005-01-27Registro en:
Physics Letters B. Amsterdam: Elsevier B.V., v. 606, n. 3-4, p. 335-341, 2005.
0370-2693
10.1016/j.physletb.2004.12.016
WOS:000226696600015
Autor
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Univ Mackenzie
Institución
Resumen
We consider a [ud](2)(s) over bar current, in the finite-density QCD sum rule approach, to investigate the scalar and vector self-energies of the recently observed pentaquark state Theta(+)(1540), propagating in nuclear matter. We find that, opposite to what was obtained for the nucleon, the vector self-energy is negative, and the scalar self-energy is positive. There is a substantial cancellation between them resulting in an attractive net self-energy of the same order as in the nucleon case. (C) 2004 Elsevier B.V. All rights reserved.