查询词典 neutral meson

In the chiral SU(3) quark model, we use the coupling between quarks and nonet scalar meson fields and nonet pseudo-scalar meson fields to describe the medium and long range interactions, and use one gluon exchange to describe the short range interaction. In the extended chiral SU(3) quark model, besides the nonet pseudo-scalar meson fields and the nonet scalar meson fields, the coupling between vector meson fields and quarks is also considered, the short range interaction can be dominately described by vector meson exchange. We investigate the nucleon-hyperon interaction in the extended chiral SU(3) quark model and study the S-wave phase shifts of N-Λ and N-Σ systems. Comparing to the results in chiral SU(3) quark model, we find that the short-range interaction could be described either by the one-gluon exchange or vector meson exchange.

在手征SU(3)夸克模型中，用夸克与标量介子九重态和赝标介子九重态场的耦合来描述中长程相互作用，单胶子交换来描述短程相互作用，推广的手征SU(3)夸克模型是在原来手征SU(3)夸克模型的基础上进一步引入了夸克和矢量介子九重态场的耦合，主要由矢量介子交换来描述短程相互作用，在推广手征SU(3)夸克模型下研究了核子－超子相互作用过程，计算了N-Λ和N-Σ相互作用的S波散射相移，通过和手征SU(3)夸克模型的结果比较，发现N-Λ和N-Σ系统的短程相互作用既可以由单胶子交换来描述，也可以由矢量介子交换来描述。

We investigate phenomenologically effects of the flavor-dependent quarkonia annihilation on the meson-meson mixing, and find that corrections due to the flavor-dependent quarknoia annihilation can be described by the constituent quark masses in the mixing model which holds for all the meson nonet. We also study the relation between Regge trajectory and meson spectrum, and therefore concluded that the quasi-linear Regge trajectory with the requirements of additivity of intercepts and inverse slopes can describe the meson spectroscopy with good accuracy, and it also holds for the radial excited mesons except for the bbbar mesons.

我们唯象地研究了味道有关的夸克偶素湮灭效应对混合的影响，发现味道有关的夸克偶素间的湮灭引起的修正可以通过组分夸克的质量来描述，考虑这种修正的混合模型可以用于所有的介子九重态；我们也研究了Regge轨迹和介子质量间关系，发现满足截距相加及斜率倒数相加的准线性Regge轨迹可以很好地描述介子的质量，除bbbar外，线性Regge轨迹也可以很好地描述介子激发态的质量；最后，我们借助于赝标介子和标量介子，讨论多个共振态的混合及衰变。

The contributions ofΨp from the pion and the kaon meson, the contribution ofΨB from B meson are not very small, and can not be safely neglected for giving more resonable results of form factors.The B meson wavefunction is a major source of uncertainty in the study of B meson decays. The B→πand B→K transition form factors provide a good platform to determine the possible regions for the two typical phenomenological parametersΛandδ.

但π、K介子波函数中的Ψp和B介子波函数中的ΨB对形状因子的贡献比较大，为了获得更加合理的形状因子的结果，一般不能忽略π、K介子波函数中的Ψp和B介子波函数中的ΨB项的贡献。B介子波函数是B介子衰变中不确定性的一个主要的来源。B→π和B→K跃迁形状因子为确定两个典型的唯象参数Λ和δ提供了一个很好的平台。

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。

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。

Sizing is clearly headed in the direction of neutral, and neutral divides in two directions: one is self-retention of neutral, such as the AKD, ASA cationtype Rosin, neutrase ployster and the other is a non-self-fixed neutral, such as the anion dispersed oil Rosin, anion, neutral polyester resin, and the latest research interest is the preparation, to meet the many self-retention and Rosin Sizing the performance of the Department of sizing agent, such as neutrase ployster, epoxidized Rosin, etc.

造纸施胶正朝着中性施胶方向迅猛发展，而中性施胶剂又分为两个方向，一是自身留着型中性施胶剂，如AKD、ASA、阳离子分散松香胶、中性聚酯，另一类是非自定型中性施胶剂，如阴离子中性分散松香、阴离子石油树脂、中性聚酯等，而最新型研究方向则是将二者统一起来，制备成兼具自身留着和松香系施胶性能的施胶剂，如中性聚酯，环氧化松香等。

Although the voice-length of the neutral tone syllable is very short, the tone pattern can be perceived. The neutral tone pitch has two types; I .the neutral tone words can be read in brief, low-drop tone when they appear behind the ~ tone, the 2nd tone and the 4~ tone, the tone pitch is 31; the neutral tone words can be read in brief, half rd high-smooth tone.

关于轻声的调值，目前学术界有两个比较有代表性的观点：1、认为轻声在四个声调之后的音高各不相同。2、认为轻声音节尽管音长短，但它的调型仍然可以感知，调值可归纳为两种情况：（1）轻声在第一声、第二声、第四声后读短促的低降调，调值拟为31。

Firstly, the effect of axial vector meson 〓(1282) upon the moment of inertia and the masssplittings of solitons are studied in the model, which comes from a U(2)〓×U(2)〓chiral meson theory.

首先，从一个U(2)〓× U(2)〓手征介子理论出发，通过模型，考察轴矢量介子〓(1282)对孤立子转动惯量和重子多重态质量劈裂的影响。

Starting from the six-quark-diagram scheme and low energy effective Hamiltonian,we calculate the various Feynman diagram s in the charmless hadronic B-meson decays for the two body pseudoscalar meson final states within the framework of perturbative QCD.

在微扰 QCD框架下，利用六夸克图方案及低能有效哈米顿，对于两体赝标介子末态，给出了诱导 B介子无璨弱衰变过程的不同费曼图的计算。

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

They experience feelings deeply and intensely, and their emotions are often mercurial.

他们的感情深刻而强烈，情绪善变。

Surrounded with or as if with a rampart.

用城墙围绕的用城墙围绕的或类似于为城墙围绕的