A QCD sum rule study of Theta(+) in nuclear matter
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Elsevier B.V.
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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.
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Physics Letters B. Amsterdam: Elsevier B.V., v. 606, n. 3-4, p. 335-341, 2005.
