介子

Any of a class of particles, such as the photon, pion, or alpha particle, that have zero or integral spin and obey statistical rules permitting any number of identical particles to occupy the same quantum state.

玻色子具有零或整数自旋状态，并且任意数目的相同粒子占据相同量子状态的统计学规则的粒子，如光子、π介子或α粒子

The antiparticle of the D?is indistinguishable from the D?

介子的反粒子同π°本身是无法区分的。

They strike the gases of the Earth's atmosphere at great speeds, creating showers of debris including streams of electron-like particles called muons.

它们高速撞击地球大气层气体，造成大量碎片，其中包括μ介子流（μ介子是一种类似电子的微粒）。

But the relatively low-energy muons produced in the atmosphere can travel only a few kilometres. So by building neutrino arrays like ANTARES and IceCube deep under water or ice, astronomers can make sure that most of the muons they detect were actually produced by cosmic neutrinos.

在大气层中产生的能量较低的μ介子穿梭距离只有几公里，也就是说，制造类似&心宿二&和&冰块&这样深埋水下或冰层下的中微子望远镜阵列，能够确定探测到的绝大多数μ介子是否由宇宙中微子产生。

The tachyon pole of σ meson propagator is avoided by introducing the linear term in the self-interaction of σ meson, and the incompressibility of nuclear matter obtained in the mean field approximation is decreased by including the vacuum fluctuation of nucleon and σ meson.

我们通过引入σ介子的自相互作用，并考虑其中的一次项，解决了σ介子传播子的快子极点问题，并降低了平均场近似得到的核物质的不可压缩系数。

This value agrees with the datum on photoproduction and scattering of pions.

这个数值和利用光生π介子反应和π介子-核子散射数据推出的值是符合的。

It is indicated that the radius parameter is insensitive to the spatial shape of the edge zone of source and is mainly affected by the size of the central zone of pions emitted in high energy heavy-ion collisions.

结果表明，半径参数主要取决于高能重离子碰撞中多数π介子产生的中间区域；对产生π介子的边缘区域的空间分布形状不敏感。

This produces particles called pions , the 'glue' that holds a nucleus together, and some of these tiny particles degrade into gamma rays.

这一过程产生的粒子叫做介子，介子象胶质封固在原子核的周围，其中有些发生衰变，成为伽马射线。

The role of pions in nuclear physics is associated intimately with chiral symmetry, and has evolved far since the initial ideas of Yukawa in which the pion was the intermediate particle of the nuclear forces.

介子在核物理中的作用直接联系着手征对称性，汤川秀树关于π介子的最初概念已经大大发展了。

Adopting Lorentz-invariant coupling model of neutron-antineutron and neutral meson strong interaction, we have physical analysis and accurate calculation on the neutron and antineutron to two neutral meson renormalization chain diagram propagator, and acquire the theoretical result; furthermore, after application of it to the physical process analysis and cross-section evaluation in this reaction , the differential cross-section of which is given. Moreover, through the comparison among this calculation and those scenarios: neutron-antineutron tree diagram and renormalization chain diagram propagator contribution, some important information about radiative correction was obtained.

采用中子-反中子与中性介子强相互作用的Lorentz不变耦合模型，对中子反中子重整化链图传播子作了有关物理分析及其严格解析计算，获得精确理论计算结果；进而将此结果用于中子反中子反应生成两个中性介子反应的物理过程分析及其截面的计算研究中，并精确计算出中子反中子重整化链图传播下中子反中子反应反应微分截面；最后还将此计算结果与中子反中子树图和重整化单圈链图传播下该反应微分截面作了对比分析，获得了有相关辐射修正的重要信息。

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％。