Positive and negative parity hyperons in nuclear medium
نویسندگان
چکیده
منابع مشابه
Positive and negative parity hyperons in nuclear medium
The effects of 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 ...
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Using SU(3) chiral perturbation theory we calculate the density-dependent complex mean field UΣ(kf ) + iWΣ(kf ) of a Σ-hyperon in isospin-symmetric nuclear matter. The leading long-range ΣN -interaction arises from one-kaon exchange and from two-pion exchange with a Σor a Λ-hyperon in the intermediate state. We find from the ΣN → ΛN conversion process at nuclear matter saturation density ρ0 = 0...
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Chiral symmetry aspects for baryon properties are studied. After a brief discussion on general framework, we introduce two distinctive chiral group representations for baryons: the naive and mirror assignments. Using linear sigma models, nucleon properties are studied in both representations. Finally, we propose an experiment to distinguish the two assignments in the reactions of pion and eta p...
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K. Nakayama,1,2,* Yongseok Oh,3,4,† and H. Haberzettl5,‡ 1Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA 2Institut für Kernphysik and Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany 3Department of Physics, Kyungpook National University, Daegu 702-701, Korea 4Asia Pacific Center for Theoretical Physics, Pohang, Gyeongbuk 790-78...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2015
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.92.054026