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In addition, for different ground meson nonets, we discuss the effect of the flavordependent annihilation on the single-octet mixing angle and Schwinger's nonet mass formula.

另外，对于不同的基态介子九重态，我们讨论了味道有关的湮灭过程对单态—八态混合角及许温格九重态质量公式的影响。

Also ,, and constitute the first radial scalar meson nonet, it is supposed that these states would likely correspond to the observed states ,, and ,respectively. The scalar state may be a good candidate for the ground scalar glueball.

结果表明，和组成基态标量介子九重态，它们分别对应于实验上观测到的共振态，，和；，，和组成第一径向激发标量介子九重态，它们分别对应于实验上观测到的，，和共振态；而是基态标量胶球很好的候选者。

In this scheme there exist a vector nonet similar to the famous scalar nonet α_0(980,f_0(980),κet al, the masses of members of the nonet are estimated, the decay of the nonet is analyzed in detail, it can decay into two pseudoscalars or one pseudoscalar and one vector meson.

我们估计了该九重态中每个成员的质量，在"fall apart"衰变机制下仔细考察了它们的衰变，它可以衰变到两个赝标介子或者一个赝标介子和一个矢量介子。

At the same time, due to 2~1S_0、 3_1S_0 are the radical excitations of 1~1S_0,we can use Regge trajectory on the (n,M~2)-plane with the approximate same slope to describe the mass of isoscalar of 3~1S_0 nonet (1926MeV). The two results derive from different ways are approximate. 2 The mass of the isodoublet of 2~3S_1 nonet is analyzed in the quarkonium-quarkonium mixing scheme, the results (1584±16.7MeV) is far from the K~*(1410)(1414±15MeV). 3 Based on "glueball dominance" picture, we establish glueball-meson mass relations. For the 2~ glueball mass and 4~ glueball mass used as input parameters, these relations predict the mass of isoscalar of 1~3F_4(4~)(2076±19.66MeV).

的质量(1900±12MeV)；同时考虑到2~1S_0、3~1S_0为1~1S_0的径向激发态，在(n，M~2)雷吉轨迹图中应该具有近似相同的斜率，利用雷吉轨迹可以得到其对应质量为(1926MeV)，两种方法得到了两个十分自洽的结果。2在介子—介子混合框架下，对2~3S_1介子九重态中同位旋二重态的质量给出估计，得到(1584±16.7MeV)，这个结果相对于K~*(1410)=1414±15MeV有较大的偏离。3在胶球为主的图像下，利用介子—胶球质量关系，选择2~与4~胶球的质量作为输入参数，我们得到1~3F_44~(介子九重态中同位旋标量态？

Because 4.03GeVis just above the threshold for the pair production of 〓 meson, the double tag method canbe employed in our measurement.

相对于MARKⅢ的结果，我们的测量值的精度有了很大的改善，可以在较大的程度上改进PDG的世界平均值。

We also discuss the contributions of the form factors and from different parts of the pion, the kaon and the B meson wave functions.

我们还讨论了π、K介子和B介子波函数的各个不同组成部分对形状因子的贡献。

We find the electromagnetic effects play the dominant role for both the pion and rho meson mass splittings.

我们发现无论是对于π介子还是ρ介子的质量分裂，电磁效应都占主导地位。

The possibilities for experimental study of meson production at Cooling Storage Ring of Lanzhou are discussed. It is shown that the study of production of the pion and eta mesons at CSR is of significance.

讨论了在兰州重离子加速装置冷却储存环上开展介子产生的实验研究的可能性和进行π和介子产生研究的意义。

In meson's rest frame, the momentumcut-off for quark, pion and sigma are introduced in three-momentumnoncovariant regularization.

选择介子的静止系，采用三动量截断的正规化方案，分别引入夸克，内π介子和σ介子的三动量截断〓，〓和〓。

When treat-ing the spectra, transition, scattering problems, we must use the semi-microscopicapproach. The main new conclusions in this thesis are following:We found the different shrinking effect in ∧ hypernuclei and 〓 hypernuclei, the shrink-ing effect in ∧ hypernuclei are confirmed in a recent experiment;We also found a new approach to treat the configuration mixing of ∧∧ hypernuclei and〓 hypernuclei and that the conversion process may change the spectra and widths of〓 hypernuclei;For the first time, we investigate the neutron star matter without the ∑ hyperon butwith the new meson 〓(975) and φ(1020), we found the contribution of 〓 and φ canmake the equation of state of neutron star soften, and the maximum mass of neutronstar reduces;we extract a set of optimum parameters of the optical potential for the scattering of 〓with nucleus, we found that the 〓 nucleus optical potential need a bigger imaginarypart.

本论文所取得的主要新成果是：独立揭示∧超核和〓超核的不同的收缩效应，其中∧超核的收缩效应被最新实验证实；提出了处理∧∧超核与〓超核混合态的新方法，并发现conversion过程使〓超核能谱和宽度改变；首次在中子星研究中在不包含∑超子的同时考虑新介子〓(975)和φ(1020)，并发现这可使中子星物质的状态方程变软、中子星半径变大、质量变小；独立提取了〓核光学势的一组最佳参数，并证明〓+核光学势要求一个较大的虚部。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。