共查询到20条相似文献,搜索用时 15 毫秒
1.
The (4, 4*) ⊕ (4*, 4) model of broken chiral SU (4) × SU (4) symmetry has been used to calculate the third-order coupling
constants involving charmed and ordinary pseudoscalar mesons. These coupling constants are exploited to derive some interesting
new relations among the masses and decay constants of these charmed particles. Using the known masses and decay constants
as inputs, we exploit these relations to predict:F
D = −1·41F
π
,F
F = −1·13F
π
,F
D/FF = 1·25,m(D
s) = 1·43 GeV,m(F
s) = 1·39 GeV andm(K
s) = 1·02 GeV. 相似文献
2.
Assuming that the anomalous magnetic moment interaction has the formaT
1
1
+bT
2
2
+cT
4
4
+sT
α
α
in SU(4), which may arise due to symmetry breaking or some other dynamical effects, we have obtained the magnetic moments
and the transition moments of the ordinary and charmed baryons. 相似文献
3.
Large SU(3) symmetry breaking effects in J/ψ→BB decay processes are discussed using the Mark I,Mark II,DM2 and the recent data from BES Collaboration. 相似文献
4.
In order to remove some of the unsatisfactory features of the GIM model, we consider15-admixture in SU(4). ΔC=±ΔS decays remain unaffected. Lee-Sugawara sum-rule is obtained.15-admixture is extended then to63-admixture in SU(8). The most general Hamiltonian (H
w∼63⊕720⊕1232) in SU(8) is found to give Lee-Sugawara relation and Σ+
+=0 forS-wave decays of uncharmed baryons. Decay amplitude relations for ΔC=−1, ΔS=0 mode are obtained. 相似文献
5.
Magnetic moments of octet baryons are parameterized to all orders of the flavor SU(3) breaking with the irreducible tensor technique in order to extract the contribution of each flavor quark to the magnetic moments of the octet baryons. The not-yet measured magnetic moment of ∑0 is predicted to be 0.649μN. Our parameterized forms for the magnetic moments are explicitly flavor-dependent, and hence each flavor component of the magnetic moments can be evaluated directly via the flavor projection operator. It is found that the strange magnetic moment of the nucleon is suppressed due to the small isoscalar anomalous magnetic moment of the nucleon. In particular, the strange magnetic form factor of the nucleon turns out to be positive, GNs(0)=0.428μN, which is consistent with recent data. 相似文献
6.
用改进的格点哈密顿量和变分法,研究了2维SU(NC)规范场中矢量介子质量MV与夸克质量m和Wilson参数 的依赖关系.数值结果表明:对于NC =2、3、4、5、6、7, …,在标度窗口 内,MV/g与m的依赖关系近似为直线;但是矢量介子质量MV不明显依赖于Wilson参数 (这与夸克凝聚的情况不同). 特别是,当 时, 本文的格点结果与Bhattacharya’s的连续理论强耦合相分析结果很好地一致, 而 的值十分接近Schwinger模型中的相应值. 相似文献
7.
Using the MelJin inversion formulas we derive the weight function for constructing the completeness relation of the boson SU(3) charged and hypercharged coherent state. A suitable contour integration is selected for this derivation. 相似文献
8.
The magnetic moments ofb-quark baryons within the framework of five quark models are derived. Also the transition magnetic moments of variousb-quark baryons are calculated. 相似文献
9.
In this paper, we obtain the eigenstates and the eigenvalues of the Hamiltonians of the trigonometric SU(N) Gaudin model based on the quasi-classical limit of the trigonometric SU(N) chain with the periodic boundary condition. By using the quantum inverse scattering method, we also obtain the eigenvalues of the generating function of the trigonometric SU(N) Gaudin model. 相似文献
10.
Mass relations among charmed and uncharmed baryons belonging to20 and20′ multiplets of SU(4) are derived in the framework of SU(8) symmetry, Spin singlet mass breaking interaction is found to give
unsatisfactory results. Second order effects and spin triplet mass breaking interactions are studied to improve the situation. 相似文献
11.
D K Choudhury 《Pramana》1976,7(5):307-312
Using Glauber’s theory of eikonal approximation, an algebraic representation of the broken Zweig rule in the constituent quark
model is obtained. Null plane language is then elaborated. It is pointed out that the exotic current associated with the disconnected
quark diagrams, which break the Zweig rule, can have canonical dimension. 相似文献
12.
13.
The Hamiltonians of the SU(3) Gaudin model are constructed based on the nonrelativistic limit of the SU(3) chain.After the quantum determinant being well defined,the eigenvectors and eigenvalues of the Hamiltonians of the SU(3) Geudin model are given.These results can be generalized to any number of constituting spins (SU(N)). 相似文献
14.
M S Sri Ram 《Pramana》1982,19(5):501-512
Weinberg-Salam model is considered in the light of SU(4) × SU(4) chiral symmetry for mesons. The Higgs doublet and the pseudoscalar
mesons mix in this framework. Consequences of this mixing for the Higgs decays and the nonleptonic decays of the mesons are
explored. 相似文献
15.
16.
Sum rules for the coupling constants for D (20), B (20′) and P (16) are given taking into account first order breaking of SU (4) and SU (3) symmetries. The D (20) and B (20′) contain the usual 3/2+ baryon decuplet and 1/2+ baryon octet of SU (3), while the P (16) contains the usual pseudoscalar octet of pions, etc. These sum rules generalize the decuplet → octet + octet sum rules of
broken SU (3 to a broken SU (4) symmetry scheme, in particular the charm SU (4) for hadrons. It is pointed out that, of the
many sum rules, it may be possible to check some of them experimentally (see Section 5) and thus provide a test for an underlying
SU (4 symmetry for strong interactions. 相似文献
17.
The mixing angles of meson isosinglets belonging to the 24-dimensional and singlet representations of SU(5) are calculated
under specific assumptions in the non-relativistic quark model. The procedure to extend the scheme to SU(N) has been outlined. The results have been compared with other earlier estimates. 相似文献
18.
We present the solution of the non-Abelian SU (3) Chern-Simons field theory defined in a generic three-manifold which is closed, connected and orientable. The surgery rules, which permit us to solve the theory, are derived and several examples of vacuum expectation values of Wilson line operators are computed. The three-manifold invariant associated with the non-Abelian SU (3) Chern-Simons model is defined and its values are computed for various three-manifolds. 相似文献
19.
最近杰斐逊实验室测量了中子的两个弹性电磁形状因子之比GEn/GMn,它反映了中子内部的电磁分布并能帮助理解中子的内部结构.传统的相对论组分夸克模型在解释质子的两种电磁形状因子之比GEp/GMp是很成功的,但在解释中子的该比值时计算值比实验值要低.为了解释这种现象,我们在相对论组分夸克模型框架下计算考察了SU(6)破缺效应的贡献.发现考虑该破缺效应后的计算结果同实验符合有明显改善. 相似文献