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1.
2.
A relativistic model of independent quarks based on Dirac equation with an equally mixed scalar-vector square root confining
potential is used to compute the quark core contributions to the static properties like magnetic moments, charge radii and
axial vector coupling constant ratios of the baryon octet. The results obtained with appropriate corrections due to centre-of-mass
motion agree fairly well with experimental values. The model is also extended to the study of magnetic moments of the quark
core of baryons in the charmed andb-flavoured sectors and the overall predictions so obtained compare well with other model predictions. 相似文献
3.
用振幅比之方法计算了中性粲介子衰变到CP本征态的CP不对称性. 计算了时间相关和时间积分的CP不对称性. 结果表明, 时间积分的CP不对称参数约为千分之一的量级. 还讨论了在BESⅢ和B工厂上实验检验的可能性. 相似文献
4.
A simple independent-quark-model based on the Dirac equation with logarithmic potential is used to calculate several properties
of octet baryons such as magnetic moment, the axial vector coupling constantg
A (n) for neutronβ-decay and the charge radius of the proton. In view of the simplicity of the model, the results obtained are quite good. 相似文献
5.
Possible structures and properties of some excited states of Λc+ dynamically generated in the coupled-channel P-wave meson-baryon scattering are studied by solving the Bethe-Salpeter(BS) equation in the framework of the Chiral Unitary Approach. It is shown that both Λc+(2765) and Λc+(2940) could be generated dynamically and could be compound states with multi-configuration molecular-like structures. The couplings of the generated states to various reaction channels are also calculated. Moreover, two highly excited states, Λc+(3024) and Λc+(3134), are predicted. 相似文献
6.
The SELEX Collaboration has reported a very large isospin splitting of doubly charmed baryons. We show that this effect would imply that the doubly charmed baryons are very compact. One intriguing possibility is that such baryons have a linear geometry Q–q–Q where the light quark q oscillates between the two heavy quarks Q , analogous to a linear molecule such as carbon dioxide. However, using conventional arguments, the size of a heavy-light hadron is expected to be around 0.5 fm, much larger than the size needed to explain the observed large isospin splitting. Assuming the distance between two heavy quarks is much smaller than that between the light quark and a heavy one, the doubly heavy baryons are related to the heavy mesons via heavy quark–diquark symmetry. Based on this symmetry, we predict the isospin splittings for doubly heavy baryons including Ξcc, Ξbb and Ξbc. The prediction for the Ξcc is much smaller than the SELEX value. On the other hand, the Ξbb baryons are predicted to have an isospin splitting as large as (6.3±1.7) MeV. An experimental study of doubly bottomed baryons is therefore very important to better understand the structure of baryons with heavy quarks. 相似文献
7.
S M Sheikholeslami 《Pramana》1997,48(3):837-848
We study here the Cabibbo enhanced charmed baryon decays in theSU(4) semidynamical model. The weak Hamiltonian 20″ + 15 + 45 + 45* can have the parity violating amplitude for charmed baryon
decays. Decay width and α for some modes are also calculated. 相似文献
8.
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
9.
M. Karliner 《中国物理 C》2010,34(9):1191-1194
I discuss several recent highly accurate theoretical predictions for masses of baryons containing the b quark,especially Ωb (ssb) very recently reported by CDF.I also point out an approximate effective supersymmetry between heavy quark baryons and mesons and provide predictions for the magnetic moments of Λc and Λb .Proper treatment of the color-magnetic hyperfine interaction in QCD is crucial for obtaining these results. 相似文献
10.
Photoproduction of baryons with strangeness,such as the Σ(1385),Λ(1520) and possibly the Θ +,are described from measurements at the LEPS/SPring-8 facility in Japan.Linearly polarized photons in the energy range of 1.5–2.4 GeV,along with the forward-angle kinematics at LEPS,provide unique data to learn about these baryons,which are non-perturbative solutions of QCD. 相似文献