Based on the diquark model, we assume that the light scalar mesons are q^2q^-2 states rather than qq^-. The chiral effective Lagrangian for the light scalar meson is constructed, and the mass relations are obtained： ...Based on the diquark model, we assume that the light scalar mesons are q^2q^-2 states rather than qq^-. The chiral effective Lagrangian for the light scalar meson is constructed, and the mass relations are obtained： the isotriplet （a0） and the isosinglet （f0） are the heaviest and are degenerate, the isodoublets （κ） are heavier and the other isosinglet （σ） is the lightest; and 2Mκ^2 = Mα0^2＋ Mσ^2. Using experimental value for a0 and σ mass, we obtain Mκ=794 MeV, which is consistent with the experimental value. Then taking Г（a0^0 →ηπ^0） = 90 MeV and Г（f0→π^0π^0） = 20 MeV, we get the width of σ is： Г（σ0→π^＋π^-）= 150 MeV.展开更多
Background: Horner’s syndrome is defined as a combination of a series of symptoms following the injury of oculosympathetic pathway. This dysfunction is usually acquired during cervical surgery but rarely triggered by...Background: Horner’s syndrome is defined as a combination of a series of symptoms following the injury of oculosympathetic pathway. This dysfunction is usually acquired during cervical surgery but rarely triggered by thyroid-surgery. Case Presentation: Here we present two cases secondary to thyroidectomy. Two young female patients, both diagnosed as tumor in left lobe of thyroid, had Horner’s syndrome after surgery. Fortunately, Horner’s syndrome was relieved after steroid treatment. Conclusions: Indirect mechanism involved in the lesion and the direct factor with mistaken section of nerve fibers may be responsible for Horner’s syndrome. Besides, Horner’s syndrome after thyroid surgery may be revisable after oral steroid treatment.展开更多
基金National Natural Science Foundation of China under Grant No.90503011
文摘Based on the diquark model, we assume that the light scalar mesons are q^2q^-2 states rather than qq^-. The chiral effective Lagrangian for the light scalar meson is constructed, and the mass relations are obtained： the isotriplet （a0） and the isosinglet （f0） are the heaviest and are degenerate, the isodoublets （κ） are heavier and the other isosinglet （σ） is the lightest; and 2Mκ^2 = Mα0^2＋ Mσ^2. Using experimental value for a0 and σ mass, we obtain Mκ=794 MeV, which is consistent with the experimental value. Then taking Г（a0^0 →ηπ^0） = 90 MeV and Г（f0→π^0π^0） = 20 MeV, we get the width of σ is： Г（σ0→π^＋π^-）= 150 MeV.
文摘Background: Horner’s syndrome is defined as a combination of a series of symptoms following the injury of oculosympathetic pathway. This dysfunction is usually acquired during cervical surgery but rarely triggered by thyroid-surgery. Case Presentation: Here we present two cases secondary to thyroidectomy. Two young female patients, both diagnosed as tumor in left lobe of thyroid, had Horner’s syndrome after surgery. Fortunately, Horner’s syndrome was relieved after steroid treatment. Conclusions: Indirect mechanism involved in the lesion and the direct factor with mistaken section of nerve fibers may be responsible for Horner’s syndrome. Besides, Horner’s syndrome after thyroid surgery may be revisable after oral steroid treatment.
