介子

In the relativistic σ-ω model, the influence of the parameters in self-interaction of σ meson to the equation of state of normal nuclear matter, especially, to incompressibility, effective mass, and coupling constants, is studied in detail. We find that these parameters have an intense relationship to the property of nuclear matter.

在相对论σ-ω模型里，详细讨论了σ介子的自相互作用参数对正常核物质物态方程的影响，特别是对核物质的不可压缩系数、有效质量，以及σ介子与核子、ω介子与核子之间的耦合常数的影响，发现这些参数与核物质的性质之间有紧密的联系。

But, because high-speed of meson and ambient-conditions of meson, they have occurred change as follows

介子或者光子的环境条件。因为高速介子和介子的环境条件，他们已发生如下变化

Modern physics confirmed, besides mesotron with charge, there are still litmusless mesotron, whose gravity mass just equals or nearly equals the gravity mass of the mesotron with charge, and the characters of the both mesotron are rather similar.

现代物理学认为除了带电介子外，还存在中性介子，其质量恰好等于或者近似等于带电介子的质量，性质相似。

Our paper is organized as follows: lIn the quarkonium-quarkonium mixing scheme, we predict the mass of isoscalar of the 3~1S_0 nonet(1900±12MeV).

在这里，我们主要做了三方面的工作：1在介子—介子混合框架下，估计了3~1S_0介子九重态中同位旋标量态？

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。

And the different influences of pion andsigma's fluctuations are discussed.

集中讨论π介子和σ介子的截断对介子修正的不同影响。

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〓。

For example, if in additions to the baryon field, we only consider the σ or ω meson field, the effects of selfconsistency are all significant. It diminishes the continuum part of the spectral representation and makes its single-particle part more important.

例如，除重子场外只考虑σ或ω介子场时，自洽效应均颇显著，但同时考虑σ和ω介子场时，自洽效应却可以忽略，这说明不同的介子场间其自洽效应互有影响。

By applying the above mentioned theoretical approaches in the secondhalf of this thesis, we study several phenomenologically interesting problems including the B meson nonleptonic decays, rare decays and the extractionof the CKM matrix element 〓. With the hypothesis of factorization, thetwo-body nouleptonic decays of B mesons are analyzed.

本文的后半部分应用上述理论进展，分别探讨与研究了B介子的非轻衰变，稀有衰变以及CKM矩阵元Vub的抽取等问题，在因子化假设下，我们分析了B介子的二体非轻衰变，并得到〓介子的衰变常数约为280 MeV。

If we want to get the effective mass by the method of computing the meson self-energy , we need to consider the change of the effective mass of the nucleon along with the increasing density of the nuclear matter,namely considering the fluctuation of the vaccum.

很多研究[3，4，5，6，11，12]表明了上式描述的规律是正确的，如果用计算介子自能的方法来得到介子的有效质量，需要考虑核子的有效质量的随核物质的密度的变化，即需要考虑核子的真空涨落，当不考虑核子有效质量随核物质密度变化的时候，ρ介子、ω介子的有效质量一般是上升的。

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％。