介子

Iii The form factors of heavy pseudoscalar meson decays to light vector mesons are calculated in light-cone QCD sum rules.

用光锥QCD求和规则方法计算了重赝标量介子到轻矢量介子的跃迁形状因子。

We thus give a detailed discussion for QCD factorization involved the complete chirally enhanced power corrections for B decays to two light pseudoscalar mesons. We point out that chirally enhanced corrections can be included consistently in the framework of QCD factorization only if the twist-3 distribution amplitudes are symmetric.

我们仔细讨论了B介子衰变到两个轻的赝标介子中的手征增强修正效应并指出，仅在twist-3波函数对称的条件下，手征增强修正才能被自洽的纳入QCD因子化框架。

We find that, i the diagrams withthe annihilation topology have a suppression factor 〓 relative to those withspectator topology; ii our results are much different from other model predic-tions for some decays modes; iii the pure W-exchange process 〓with a branching ratio 〓 can be found even before the B-factory era;iv for B →ππ,πK and KK decays, our results are well below the experimen-tal upper limits, but they are about one order of magnitude below the BSWpredictions.

其次，我们从有效哈米顿出发，利用微扰QCD方法系统研究了末态为两个赝标介子的B介子衰变过程，对可能的图进行了分类，给出了一般的计算方法和一般性公式，并且将其应用于纯W湮灭和W交换过程，B→ππ，πK和KK过程以及〓→PP过程。

We presented the extraction of Wilson coefficients, the evolvement of the renormalization group and the definition and current experimental progress of CP violation of B meson.

介绍了Wilson系数的抽取和重整化群演化，B介子系统CP破坏的定义和实验测量现状，给出了相关的理论公式，并对目前和未来的B介子实验做了简要的评述。

In this thesis, we give a review on RMF model systematically. Combining the quake effort on the meson field introduced by Quantum meson coupling model, we reconstruct the RMF model and investigate the basic property of some nuclei.

本文首先介绍了量子强子动力学理论，这个理论是在很多地方都有成功的应用，在 QHD 基础上，引入了考虑核内结构的夸克介子耦合模型，借鉴 QMC 中对夸克介子的成功耦合，本文改进相对论平均场理论，使其更精确的计算锂等原子核的基态性质，研究中子晕等现象。

However, the self-consistency makes the results obtained in the π-ω model comparable with those in σ-ω model.

与σ-ω模型相反，由π介子和ω介子引起的自洽效应是相互加强的。

It is found that the unitarity of the effective meson theory resulted from resummation derivations demands an upper-limit to the momentum of vector meson.

我们发现，用重求和方法得到的等效介子理论，其么正性要求矢量介子的动量有一个上限。超过此上限，这种手征等效理论的描写方式失效。

In this paper,the theory of mesonic Bethe-Salpeter equation with instantaneousinteraction is generalized to the case where the mass of the straton is not equal tothat of the antistraton.

本文把在瞬时相互作用下介子 Bethe-Salpeter 方程求解的理论推广到组成介子的层子和反层子质量不一定相等的情形。

The problem is how to consider the relativistic corrections to this potential. Adopting the assummation that the quark interaction is the sum of the usual one-gluon direct exchange and the mixture of linear scalar and vector potentials, we structure the relativistic corrections of order v2/c2to the Cornell potential, including the annihilation potential for the quark and antiquark of the same favors which plays the same role with the one-gluon direct exchange at short distances.

采纳库仑势源于单胶子直接交换，而线性禁闭源于标量和矢量的混合，同时考虑在短程区域与单胶子直接交换起同样作用的同味正反夸克的湮灭，构造了静态夸克-反夸克势到v~2／c~2级次的完全相对论修正，并拟合计算了重介子偶素的能谱，讨论了相对论修正对重介子偶素能级分裂的作用。

Along with 〓 becoming small, the self-consistent results of the baryon spectral functions α and β first increase and then decease.

另外，由σ介子和ω介子引起的自洽效应之间仍然存在相互抵消的作用。

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％。