The effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD . UKQCD Collaboration
The effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD . UKQCD Collaboration
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发表时间：
1996
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通讯作者：
H. P. Shanahan;C. Davies;K. C. Bowler;R. Kenway;D. G. Richards;P. Rowland;S. M. Ryan;C. Michael
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作者：
H. P. Shanahan;C. Davies;K. C. Bowler;R. Kenway;D. G. Richards;P. Rowland;S. M. Ryan;C. Michael
我们使用O(a)改进的Sheikholeslami-Wohlert （SW）费米子作用计算了β = 5.7处的光强子质谱，并选择了两种三叶草系数：经典值c = 1和平均场或蝌蚪改进估计c = 1.57。我们将我们的结果与GF11合作使用威尔逊费米子作用（c = 0）的结果进行了比较。我们发现，将c从0变为1和1.57会导致手性外推和奇异伪标量和矢量介子、核子、∆以及爱丁堡图的质量发生显著差异。许多其他的量，例如mV - m2ps， J， amK/amρ和amK * /amρ似乎没有显著的变化。我们还研究了将晶格体积从大约（2fm）改变为（2.6 fm）的效果。我们发现介子质量在一个标准差内一致，重子质量在两个标准差内一致。pac: 11点15分。哈,12.38。Gc, 14.65.Bt
We compute the light hadron mass spectrum at β = 5.7 using the O(a)improved Sheikholeslami-Wohlert (SW) fermion action with two choices of the clover coefficient: the classical value, c = 1, and a mean-field or tadpoleimproved estimate c = 1.57. We compare our results with those of the GF11 Collaboration who use the Wilson fermion action (c = 0). We find that changing c from zero to 1 and 1.57 leads to significant differences in the masses of the chirally extrapolated and strange pseudoscalar and vector mesons, the nucleon, the ∆, and also in the Edinburgh plot. A number of other quantities, for example mV −m 2 PS, J , amK/amρ and amK∗/amρ do not appear to change significantly. We also investigate the effect of changing the lattice volume from approximately (2 fm) to (2.6 fm). We find that the meson masses are consistent to within one standard deviation and baryon masses are consistent to within two standard deviations. PACS : 11.15.Ha, 12.38.Gc, 14.65.Bt