Positive and negative parity hyperons in nuclear medium

K. Azizi, N. Er, and H. Sundu
Phys. Rev. D 92, 054026 – Published 22 September 2015

Abstract

The effects of the nuclear medium on the residue, mass, and self-energy of the positive- and negative-parity Σ, Λ, and Ξ hyperons are investigated using the QCD sum-rule method. In the calculations, the general interpolating currents of hyperons with an arbitrary mixing parameter are used. We compare the results obtained in medium with those of the vacuum and calculate the shifts in the corresponding parameters. It is found that the shifts on the residues in nuclear matter are overall positive for both the positive- and negative-parity hyperons, except for the positive-parity Σ hyperon which has a negative shift. The shifts on the masses of these baryons are found to be negative. The shifts on the residues and masses of negative-parity states are large compared to those of positive-parity states. The maximum shift belongs to the residue of the negative-parity Λ hyperon. The vector self-energies gained by the positive-parity baryons are large compared to the vector self-energies of the negative-parity particles. The maximum value of the vector self-energy belongs to the positive-parity Σ hyperon. The numerical values are compared with the existing predictions in the literature.

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  • Received 16 June 2015

DOI:https://doi.org/10.1103/PhysRevD.92.054026

© 2015 American Physical Society

Authors & Affiliations

K. Azizi1,*, N. Er1,2,†, and H. Sundu3,‡

  • 1Department of Physics, Doğuş University, Acıbadem-Kadıköy, 34722 İstanbul, Turkey
  • 2Department of Physics, Abant İzzet Baysal University, Gölköy Kampüsü, 14980 Bolu, Turkey
  • 3Department of Physics, Kocaeli University, 41380 İzmit, Turkey

  • *kazizi@dogus.edu.tr
  • nuray@ibu.edu.tr
  • hayriye.sundu@kocaeli.edu.tr

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Vol. 92, Iss. 5 — 1 September 2015

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