查询词典 meson

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

The predictions derived from our relation are in reasonable agreement with those given by many other different approaches.Based on the main assumption that a_0(980) and D*_(2317) belongto 1~3 P_0 multiplet, in the framework of Regge phenomenology andmeson-meson mixing, we suggest that a_0(980), K_0*( 1052), f_0( 1099) and f_0(530) constitute the ground scalar meson nonet.

另外，我们假定a_0(980)和D_~*(2317)态是通常的1~3P_0介子态，在Regge唯象和介子混合的框架下，我们对基态标量介子九重态可能安排进行了讨论，我们建议a_0(980)，K_0~*(1052)，f_0(1099)和f_0(530)组成基态标量介子九重态。

In the past years, the chiral SU(3) quark model has achieved success. In this model, the nonet pseudo-scalar meson exchanges and the nonet scalar meson exchanges are considered in describing the medium-and long-range parts of the interactions, and the one gluon exchange describe the short-range repulsion.

过去几年来，手征SU(3)夸克模型已经取得了相当的成功，应用该模型统一地解释了重子基态的能谱，核子-核子以及核子-超子散射过程，并由此预言了实验上可能存在的双重子束缚态。

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。

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 hope to extendedly study the ''string" and ''brane" property to clarify the ''AdS/CFT correspondence and understand the property of Wilson Loop, meson spectrum, Glueball spectrum, etc…in physical system.

我们希望透过研究「弦」与「膜」的性质，来广泛的研究实际物理系统上的「AdS/CFT」对应，以进一步了解包括，Wilson Loop，Meson 质谱，Glueball 质谱等等的性质。

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。

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。

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％。