A QCD Sum Rule Study of $Θ^+$ in Nuclear Matter

Details A QCD Sum Rule Study of $Θ^+$ in Nuclear Matter A QCD Sum Rule Study of $Θ^+$ in Nuclear Matter

2004-08-30

arxiv.org/abs/nucl-th/0408072v2

Phys.Lett. B606 (2005) 335-341

Physics

Nuclear Physics

Nuclear Theory

5 pages, 3 figures replaced version accepted for publication in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2004.12.016

We consider a $[ud]^2\bar{s}$ 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 mater. 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.

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