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We report our lattice simulation on the charmonium spectra in the quenched approximation. Because the complete adjustment on all the nonperturbative parameters needs much calculation time, we only adjust two of them, but with some rescaling for mass splitting. After the rescaling, the calculated masses of meson are 3.030 GeV (ηc),3.080 GeV (J/ψ), 3.546 GeV (he) and 3.412 GeV (Xco) respectively, which is in agreement with the experimental results. 相似文献
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利用一个特殊的表示空间, 给出了Sn群表示[n—1, 1]的实正交形式的一般公式. 并举例说明了该技巧的一个应用. 相似文献
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We study here a quantum version of Foldy--Wouthuysen--Tani (FWT)
transformation and compare the similarities and differences between
the quantum and the classic FWT theories. Then the improvement of
action on lattice is discussed. The result shows that it is not
necessary to improve the covariant difference along the time
direction on lattice. Finally we discuss briefly the structure of
physical vacuum and give a model independent of field condensate. 相似文献
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用二维多时标全电磁模相对论粒子模拟程序,对共振吸收中等离子何不皮的激发,电子的加速以及超热电子的产生进行了模拟计算,给出了合理的物理图像。 相似文献