کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10723531 | 1033865 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Baryon-baryon bound states from first principles in 3+1 lattice QCD with two flavors and strong coupling
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
We determine baryon-baryon bound states in (3+1)-dimensional SU(3) lattice QCD with two flavors, 4Ã4 spin matrices, and in an imaginary time formulation. For small hopping parameter κ>0 and large glueball mass (strong coupling), we show the existence of three-quark isospin 1/2 particles (proton and neutron) and isospin 3/2 baryons (delta particles), with asymptotic masses â3lnκ and isolated dispersion curves. Baryon-baryon bound states of isospin zero are found with binding energy of order κ2, using a ladder approximation to a lattice Bethe-Salpeter equation. The dominant baryon-baryon interaction is an energy-independent spatial range-one attractive potential with an O(κ2) strength. There is also attraction arising from gauge field correlations associated with six overlapping bonds, but it is counterbalanced by Pauli repulsion to give a vanishing zero-range potential. The overall range-one potential results from a quark, antiquark exchange with no meson exchange interpretation; the repulsive or attractive nature of the interaction depends on the isospin and spin of the two-baryon state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 643, Issue 2, 7 December 2006, Pages 109-114
Journal: Physics Letters B - Volume 643, Issue 2, 7 December 2006, Pages 109-114
نویسندگان
Paulo A. Faria da Veiga, Michael O'Carroll,