منابع مشابه
Erratum: Isospin violation in QCD sum rules for baryons
PACS number(s): 11.55.Hx. , 11.30.Hv, 14.20.Dh, 99.10.+g In a recent paper [1], it was brought to our attention that some numerical factors in our equations were in error. In Eq. (3.12), the second sum rule for the nucleon, the term reading —za2 should read —za . As a consequence, the term sa2 in Eq. (3.34) is replaced by &a . There is also a change in the sum rule for the Z hyperons. In Eq. (3...
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QCD sum rules for decuplet baryon two-point functions are investigated using a comprehensive Monte-Carlo based procedure. In this procedure, all uncertainties in the QCD input parameters are incorporated simultaneously, resulting in realistic estimates of the uncertainties in the extracted phenomenological parameters. Correlations between the QCD input parameters and the phenomenological parame...
متن کاملIsospin violation in QCD sum rules for baryons.
We thoroughly analyze isospin-violating effects in QCD sum rules for the masses of nucleons, X, and :hyperons. After comparing with experimental mass splittings in isotopic multiplets, we obtain for the isospin breaking in the quark condensate (0~uu —dd ~0) /(0~uu ~0) =(2+1)X 10 ', a value significantly smaller than the one usually adopted. We present arguments in favor of our result and critic...
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Quantitative corrections are estimated to three of Franklin's sum rules involving the masses of baryons containing at least one charmed quark and to three analogous sum rules for baryons containing at least one bottom quark. The corrections arise from three-body contributions to baryon interaction energies and are calculated from a semiempirical formula for the colormagnetic contributions to ba...
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By comparing SU(3)-breaking scales of linear mass formulae, it is shown that the lowest vector, axial-vector, and scalar mesons all have a q̄q configuration, while the ground-state octet and decuplet baryons are qqq. Also, the quark-level linear σ model is employed to predict similar q̄q and qqq states. Finally, the approximate mass degeneracy of the scalar a0(980) and f0(980) mesons is demonstra...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1963
ISSN: 0033-068X
DOI: 10.1143/ptp.29.614