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arXiv 0709.4582hep-lat
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动力学手征改进夸克:强子质量的初步结果

Dynamical Chirally Improved Quarks: First Results for Hadron Masses

R. Frigori, Ch. Gattringer, C. B. Lang, M. Limmer, T. Maurer, D. Mohler, A. Schäfer

摘要:

我们提出了第一个研究结果与两个质量简并动力学手征改进(CI)费米子的晶格空间范围2.4 FM。CI Dirac算子在很好的近似下服从Ginsparg-Wilson条件。对于16**3*32晶格,我们使用的π介子质量仍然是大的O(470 MeV),晶格间距为0.15 fm。用变分法得到了强子质量,并与以前用相似晶格参数计算的结果进行了比较。我们发现迹象的等矢量,标量介子a0(980)附近的实验值,在对比淬火的结果,总是产生一个质量值与第一次激发a0(1450)兼容。

英文摘要:

We present first results for a study with two mass-degenerate dynamical Chirally Improved (CI) fermions on lattices of spatial extent 2.4 fm. The CI Dirac operator obeys the Ginsparg-Wilson condition in good approximation. The pion mass we use is still large O(470 MeV) for the 16**3*32 lattices with lattice spacing of 0.15 fm. The hadron masses are obtained with the variational technique and the results compared with earlier quenched calculations with similar lattice parameters. We find indications for the isovector, scalar meson a0(980) near the experimental value, in contradistinction to quenched results which always produced a mass value compatible with the first excitation a0(1450).

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