A QCD Sum Rule Study of $\Theta^+$ in Nuclear Matter
Nuclear Theory
2009-11-10 v2 High Energy Physics - Phenomenology
Abstract
We consider a current, in the finite-density QCD sum rule approach, to investigate the scalar and vector self-energies of the recently observed pentaquark state , 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.
Cite
@article{arxiv.nucl-th/0408072,
title = {A QCD Sum Rule Study of $\Theta^+$ in Nuclear Matter},
author = {F. S. Navarra and M. Nielsen and K. Tsushima},
journal= {arXiv preprint arXiv:nucl-th/0408072},
year = {2009}
}
Comments
5 pages, 3 figures replaced version accepted for publication in Phys. Lett. B