介子

Review our previous work on formally derive the chiral Lagrangian of low lying Octet pseudoscalar mesons from the first principles of QCD.

本文首先以QCD为背景，介绍了Gasser-Leutwyler的手征拉氏量理论，然后回顾了从QCD出发形式推导赝标介子手征拉氏量的工作。

Since 0- glueball can not decay into the pseudoscalar pair channels such as ππ- and K K- due to P parity constraint, The J/ψ→γVV decay channel become the important process for 0- glueball search and study.

由于宇称的约束，0-的胶球不能衰变道赝标量介子对， J/ψ→γVV是0-胶球寻找的重要物理道。

The new introduced physics mechanisms in PYTHIA version6.3 indicate that the complicated string junction may contribute to this splitting effect between mesons and baryons.

在PYTHIA6.3版本中引入的新的物理机制表明复杂的弦纠缠形式可能是这种重子一介子差异的主要原因。

The use of path integralover the quark fields leads to an effective field theory of mesons.

通过对夸克场的路径积分，可以导出一个低能的等效介子场论。

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。

The Palestinians will undoubtely consider Olmerts kiss a proof that Abbas is nothing more than an Israeli pion, let us say a Palestinian Quisling, that is to say traitor''.

毫无疑问，巴勒斯坦人会认为阿巴斯只不过是以色列的一个介子，或者说一个巴勒斯坦的"卖国贼"。

In the high energy physics laboratory called CERN, just outside Geneva in Switzerland, unstable muons (a type of fundamental particle that normally undergoes radioactive disintegration after about one millionth of a second) have been found to live longer by factor of thirty when travelling at high speed around a circular machine shaped like a large hollow doughnut.

在一个叫做 CERN 的高能量物理实验室，这个实验室在瑞士的日内瓦郊外，不稳定的μ介子（一种基本粒子，在百万分之一秒内会进行放射性衰变。）在绕着一个外形像中空的炸面圈形状的圆形机器中高速运行时，它的存在时间已经可以延长30倍了。

We used reduced Bethe-salpeter equation to study the properties of heavy flavor mesons at a finite temperature.

我们采用约化的Bethe-Salpeter方程讨论了重味介子在有限温度下的性质，并基于Charmonium谱的统计性质提出了J／Ψ压低的一种新的机制。

The BEijing Spectrometer is an only large general purpose solenoidal detector at the BEPC, on which the physics is to study e+e- collide physics in 2-5GeV region , the emphasis is in the τ-charm physics and the topics include J/ψ physics,ψ(2S) physics, T physics, Ds physics, D physics and hadrons generation mechanism as well as the test of QCD in 2-5GeV.

经过中外科学家的共同努力，在北京谱仪上已作出了包括"τ轻子质量的精密测量"、"2-5GeV能区的R值测量"，以及在J／ψ、ψ(2S)、Ds介子等物理研究中的多项国际领先水平的重要科研成果，引起了国际高能物理界的普遍重视和广泛关注。

We obtain a new quark potential from the effective dilaton-gluon-coupling inspired by superstring theory, and by using this static potential, we explore the mechanism of quark confinement through calculations of the spin-average energy levels, the widths of the leptonic decays and radiative transitions for heavy quarkonium. The obtained results are compared with that of the Cornell potenial.

由规范场理论的超弦理论所激发的伸缩子一胶子有效藕合，给出了一个新的静态夸克一反夸克势，讨论了此势模型下重介子的自旋平均能谱、轻子衰变和辐射跃迁宽度，并与Cdrn叭势模型所得到的相应结果作了比较。

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％。