کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8186724 1528775 2018 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Baryon masses and σ terms in SU(3) BChPT × 1/Nc
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Baryon masses and σ terms in SU(3) BChPT × 1/Nc
چکیده انگلیسی
Baryon masses and nucleon σ terms are studied with the effective theory that combines the chiral and 1/Nc expansions for three flavors. In particular the connection between the deviation of the Gell-Mann-Okubo relation and the σ term associated with the scalar density u¯u+d¯d−2s¯s is emphasized. The latter is at lowest order related to a mass combination whose low value has given rise to a σ term puzzle. It is shown that while the nucleon σ terms have a well behaved low energy expansion, that mass combination is affected by large higher order corrections non-analytic in quark masses. Adding to the analysis lattice QCD baryon masses, it is found that σπN=69(10) MeV and σs has natural magnitude within its relatively large uncertainty.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 781, 10 June 2018, Pages 719-722
نویسندگان
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