共查询到20条相似文献,搜索用时 31 毫秒
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The potential well depth of Λ particle in nuclear metter is calculated by using the Λ-N potential from single K, η, ω and 2π, πρ meson exchanges. 相似文献
3.
Using SU(3)×SU(3) symmetry the bag model with pion cloued suggested in re-cent years is generalized to the bag model containing K, η, η′meson cloud. The massspectra of hadrons are calculated and the origin of pion cloud is discussed. 相似文献
4.
The mass spectrum of the J/ψ meson family can't be explained by the MIT bagmodel.Based on the theory of our Rubber Bag model of hadrons,the mass spectrumof the ordinary hadrons and that of the J/ψ family (ψ(3772) included) are calcula-ted in a unified way in this paper.The results so obtained conform well to experi-mental data. 相似文献
5.
Sun Hung-zhou 《中国物理C(英文版)》1980,4(1):73-92
In this paper, we analyse the commutation relations of the infintesimal opera-tors of the group SU3 and find that the eight infinitesimal operators of the groupSU3 can be written as a scalar operator A, three angular momentum operators (L1,Lo, L-1,)and two sets of the irreducible tensor operators of rank 1/2, (T±1/2,V±1/2)By means of the commutation relations of these operators, all irreducible represen-tations of the group SU3 can be easily obtained. In this pape, the matrices corresponding to these operators in the irreduciblerepresentation(λμ), are given; therefore the irreducible representation and its re-presentation space Rλμ are completely defined. Besides, a method for calculatingthe scalar factors of the reduction coefficients and the symmetric relations of thosefactors are also given. As examples, the scalar factors of the reduction coefficientsof (λμ)×(10), (λμ)×(01), (λμ)×(20) and (λμ)×(11) are calculated. In the last part of this paper, we define the irreducible tensor operators ofthe group SU3 and prove the corresponding Wigner-Eckart theory. The method used in the discussion of the group SU3 be extended to allof the compact simple Lie groups of rank 2 and we shall discuss them in two suc-ceeding papers. 相似文献
6.
In this paper, the matrix elements of the nucleon-meson vertices due to one gluon exchange transition potential Vq→qqq are calculated by using the generator coordinate method. We obtain that the interaction forms of the vertices are the same as the nonrelativistic forms coming from the interactions of the nucleon field and the meson field; and the coupling constants are roughly consistent with the experimental data. 相似文献
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ON THE PHASE AND THE REPRESENTATION TRANSFORMATIONS OF SUn BARYON AND MESON WAVE FUNCTIONS 下载免费PDF全文
The baryon and meson wave functions of SUn symmetry under the Baird-Bie-denharn phase convention are given explicitly.The phase confusion is clarified andthe matrices of transformations between I-spin,U-spin and V-spin representationsare given for the IR(8),(27),(35) of SU3. 相似文献
9.
M. K. Volkov E. A. Kuraev Yu. M. Bystritsky 《Physics of Particles and Nuclei Letters》2010,7(1):10-11
Cross sections of scalar mesons f
0(980), a
0(980), and σ(600) production by colliding electron-positron beams are calculated. Two-photon decay widths of scalar mesons
obtained in the Nambu-Jona-Lasinio model are used with quark and meson loops taken into account. 相似文献
10.
ZHANG QI-REN 《中国物理C(英文版)》1979,3(1):75-79
Assuming that the nuclear binding is dominated by a real scalar meson field,the mass of this meson is calculated to be 472 MeV from the nuclear surface tension coeffici-ent,by Thomas-Fermi method and Van der Waals approximation.The agreement between this value and the mass of a chief scalar meson in the OBEP theory of nuclear force indicates that a more serious investigation of above assumption should be valuable. 相似文献
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THE INFRARED STRUCTURE AND THE ELECTROMAGNETIC FORM FACTORS OF QUANTUM CHROMODYNAMICS IN TWO DIMENSIONS 下载免费PDF全文
We discuss a model of quantum chromodynamics in 1+1 dimension.Using't Hooft's 1/N expansion and considering the effects of the infrared structure in non-Abelian gauge theories by assuming that the coupling g2(t)~1/tκ-1,the Straton's Pro-pagator and the Bethe-Salpeter equation of mesons are obtained;the propertiesof the meson wave functions and their characteristics are also discussed.From thebehaviour of the electromagnetic form factors and the deep inelastic scattering struc-ture functions obtained,it follows that κ≤2. 相似文献
12.
GAO CHUNG-SHOU 《中国物理C(英文版)》1978,2(4):311-317
In this paper, we discuss the nature of the newly discovered heavy particle Y(9.5). Five possibilities of experimental criteria are analysed. We show that if Y is a heavy photon, an intermediate boson, a bound state of straton-antistraton or a hadron without valence stratons, and all the Γee will differ by several orders of magnitude and can therefore be discriminated easily in e+ e-collision experiments. The width value Fee and its ratio of γ to γ' are not identical for the case of colour excited states of meson and the case of bound states of the new straton-antistraton. The masses of other existing new particles can also be predicted. In particular, the masses of weakly decaying heavy particles are not the same for these two cases, which may be regarded as a criterion to discriminate between these two cases. We have also discussed the main decaying properties of γ for these five possibilities. 相似文献
13.
HU NING 《中国物理C(英文版)》1978,2(4):323-335
Quantum field theory is applied to meson states formed from a pair of straton and anti-straton, and also baryon states formed from three stratons according to the straton model. Two types of effective potential are also introduced which interact with the stratons through Dirac matrices γ5 and γ4 respectively. The rest mass of the stratons is assumed to be very heavy. The resulting wave equations give very satisfactory account of the mass spectra of the ground and excited states of various mesons and baryons. 相似文献
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B. Mawlong 《Pramana》2007,69(4):521-531
The charmless nonleptonic decay modes B → f
0
K(π) involving a scalar and a pseudoscalar meson in the final state are studied. The scalar meson f
0 is considered as a q̄q state, as favored by some recent studies. Using the generalized factorization approach, the branching ratios and CP violation
parameters are computed for these modes. The form factors are calculated using the results from relativistic light front quark
model and the ISGW2 model. It is found that the direct CP violation parameters in these modes are small. However, the obtained
branching ratios are not in agreement with the experimental data. Therefore, these modes may be considered as possible probes
for new physics.
相似文献
16.
GAO LUN 《中国物理C(英文版)》1978,2(3):211-224
We continue the investigation of the equation and its solutions for the bound states of mesons discussed previously, emphasizing on large values of v, a parameter characterizing the shape of the potential. The results show that the dependence of the eigenvalues λ and some related physical quantities upon the potential parameters v and E is approximately the same as in our previous work. But the average radii of the bound mesons cease increasing as v increases. For each value of v, there exists a maximum average radius√<R2>max, and all these √<R2>max are approximately equal to 12.6 M-1 (M being the mass of the straton), which is much smaller than the experimental value of the radius of the π meson. However, if we assume, in addition to the attractive potential, there exists, for the straton-anti-straton superstrong interactions, also a repulsive potential, and, in particular, if we introduce a differencetype potential VD(r) corresponding to the potential Vv(r) in our previous work, the calculated radii of the bound mesons do approach the experimental value. 相似文献
17.
Using the renormalized quark mass m(g) obtained by fixing the ρ meson mass, we calculate the masses of the baryon states as a function of 1/g2 in lattice gauge theory with fermions by variational method. The results are in agreement with experimental values in the range of 1/g2 between 0.1 to 0.9. 相似文献
18.
We analyze two recent reactions of Belle, producing Dˉ and Dˉ* states that have an enhancement of the invariant Dˉ , Dˉ* mass distribution above threshold, from the point of view that they might be indicative of the existence of a hidden charm
scalar and an axial vector meson state below Dˉ or Dˉ* thresholds, respectively. We conclude that the data is compatible with the existing prediction of a hidden charm scalar meson
with mass around 3700MeV, though other possibilities cannot be discarded. The peak seen in the Dˉ* spectrum above threshold is, however, unlikely to be due to a threshold enhancement produced by the presence, below threshold,
of the hidden charm axial vector meson X(3872) . 相似文献
19.
A quark-quark potential is derived from the linear expression of the Lagrangian Which is invariant under the SU(3)L×SU(3)R infinitesimal transformation,and further used to make a qualitative analysis on the Λ-N interaction.The result shows that the SU(3)chiral scalar fields are important in explaining the spin-dependence feature of the Λ-N interaction. 相似文献