查询词典 meson

Also studied are the loop effects of pseudoscalar meson, which play an important role at this energy scale.

另一方面，出于理论上的考虑，Goldstone玻色子圈的贡献也已考虑进来，这种贡献所占比例不小。

Ii The form factors of heavy pseudoscalar meson decays to light vector mesons are systematically analyzed, in a model independent way.

对重赝标量介子到轻矢量介子跃迁的形状因子作不依赖于模型的分析，给出了1/m〓阶的所有独立的普适函数的数目。

By the study of pseudoscalar meson chiral Lagrangian in QCD, we develop certain useful techniques and experiences which we can generalized to other fields, for example, the investigation of electroweak chiral Lagrangian.

通过赝标介子手征拉氏量的QCD研究，我们发展的计算方法与获得的经验完全可以推广到诸如电弱有效拉氏量等其它领域的研究上去。

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。

In addition, we introduce the current status of the light meson spectroscopy and the new hadronic states lying beyond the quark model.

此外，我们简要介绍了轻介子谱的研究现状以及新强子态—胶球和混杂态。

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。

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。

We first give a brief review on the SM, the SUSY and the B meson weak decays.

首先简要介绍了标准模型、超对称和B介子弱衰变。

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。

Meson: Any member of a family of subatomic particle s composed of a quark and an antiquark.

介子：由一个夸克和一个反夸克组成的亚原子粒子族。

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％。