Isospin breaking in octet baryon mass splittings
Isospin breaking in octet baryon mass splittings
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DOI：
10.1103/physrevd.86.114511
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发表时间：
2012-06
影响因子：
5
通讯作者：
R. Horsley;J. Najjar;Y. Nakamura;D. Pleiter;P. Rakow;G. Schierholz;J. Zanotti
中科院分区：
文献类型：
--
作者：
R. Horsley;J. Najjar;Y. Nakamura;D. Pleiter;P. Rakow;G. Schierholz;J. Zanotti
利用夸克质量的SU（3）味对称性破缺展开，我们确定了核子的QCD分量，重子八重态由于上下（奇异）夸克质量差而引起的质量分裂。假设夸克的平均质量保持不变，在我们的程序中的膨胀系数可以确定从计算成本较低的模拟质量简并海夸克和部分淬灭价夸克。我们考虑了SU（3）味对称破缺展开式中的线性项和二次项，发现二次项只改变了几个百分点的结果，表明该展开式是高度收敛的。
Using an SU(3) flavour symmetry breaking expansion in the quark mass, we determine the QCD component of the nucleon, Sigma and Xi mass splittings of the baryon octet due to up-down (and strange) quark mass differences in terms of the kaon mass splitting. Provided the average quark mass is kept constant, the expansion coefficients in ourprocedure can be determined from computationally cheaper simulations with mass degenerate sea quarks and partially quenched valence quarks. Both the linear and quadratic terms in the SU(3) flavour symmetry breaking expansion are considered; it is found that the quadratic terms only change the result by a few percent, indicating that the expansion is highly convergent.