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1.
In a previous work,we proposed an extended Nambu-Jona-Lasinio(NJL)model including heavy quark flavors.In this work,we will calculate strong and radiative decays of vector mesons in this extended NJL model,including lightρ,ω,K*,(?)and heavy D~*,D_s~*,B~*,B_s~*. 相似文献
2.
Meson electro-magnetic form factors in an extended Nambu–Jona-Lasinio model including heavy quark flavors 下载免费PDF全文
Based on an extended NJL model including heavy quark flavors, we calculate the form factors of pseudoscalar and vector mesons. After taking into account the vector-meson-dominance effect, which introduces a form factor correction to the quark vector coupling vertices, the form factors and electric radii of π+and K+pseudo-scalar mesons in the light flavor sector fit the experimental data well. The magnetic moments of the light vector mesonsρ+and K*+are comparable with other theoretical calculations. The form factors in the light-heavy flavor sector are presented to compare with future experiments or other theoretical calculations. 相似文献
3.
For heavy meson systems, we study the heavy quark potential, which emerges from the effective dilaton-gluon coupling inspired from the superstring theory. We put emphasis on the new confinement generating mechanism of this potential through the investigation of the spin-averaged energy levels of the heavy meson systems. By using a unified approach to the solutions of the Schr?dinger and the spinless Salpeter equations, we can examine in a realistic way the effects of using a relativistic kinetic energy. The obtained results agree favourably with other predictions, and the relativistic equation can better account for the observed energy levels. 相似文献
4.
Some charmonium-like resonances such as X(3872) can be interpreted as possible D(*)D(*) molecular states. Within the quark model, we study the structure of such molecular states and the similar B(*)D(*) molecular states by taking into account the light meson exchange (π, η, ρ, ω and σ) between two light quarks from different mesons. 相似文献
5.
We study the branching ratios of D+→D0e+ν,DS+→D0e+ν,BS0→B+e-ν,DS+→D+e-e+ and BS0→B0e-e+ rare semileptonic decay processes,which are induced by decays of light quarks,the heavy quarks remain unchanged.The branching ratios of these decay processes are estimated in the heavy quark limit and with SU(3) flavor symmetry.We find that the decay rates are very tiny in the framework of the Standard Model.We also estimate the sensitivities of the measurements of these rare decays at the future experiments,such as BES-Ⅲ,super-B and LHC-b.Observations of these decays may shed some light on new physics beyond the standard model. 相似文献
6.
We study the branching ratios of D^+ → D^0e^+ν, Ds^+ → D^0e^+ν, Bs^0→B^+e^-^-ν, Ds^+→D^+e^-e^+ and Bs^0→B^0e^-e^+ rare semileptonic decay processes, which are induced by decays of light quarks, the heavy quarks remain unchanged. The branching ratios of these decay processes are estimated in the heavy quark limit and with SU(3) flavor symmetry. We find that the decay rates are very tiny in the framework of the Standard Model. We also estimate the sensitivities of the measurements of these rare decays at the future experiments, such as BES-Ⅲ, super-B and LHC-b. Observations of these decays may shed some light on new physics beyond the standard model. 相似文献
7.
We calculate the ρ meson couplings between the heavy hybrid doublets H~h/S~h/M~h/T~h and the ordinary qQˉ doublets in the framework of the light-cone QCD sum rule. The sum rules obtained rely mildly on the Borel parameters in their working regions. The resulting coupling constants are rather small in most cases. 相似文献
8.
A power law potential which is an equal admixture of scalar and vector parts with effective powerv ∞ 1/m
q
, is proposed as a quark confining potential in the Dirac equation. The model is capable of predicting the meson spectroscopy
encompassing both light and heavy quark-antiquark systems in a unified way. 相似文献
9.
The decay widths for the radiative decays of heavy baryons are calculated in the heavy quark effective theory. Introducing
the interpolating fields for heavy baryons we obtain the transition matrix elements and the corresponding decay widths. Considering
theSU(6) flavor-spin wave functions for heavy baryons, the coupling constants are calculated in the nonrelativistic quark model.
Since the masses of the heavy baryons are not available, we have taken the predicted bag model masses. We find our results
are quite different from that of the heavy quark bag model calculations. 相似文献
10.
11.
The radiative decays of heavy mesons are considered in heavy quark symmetry formalism. Introducing the interpolating fields
for the heavy mesons we obtain the transition matrix element and the corresponding decay widths in the heavy quark symmetry
limits. The Isgur-Wise function present in the expression is determined by ISGW quark model. The results obtained agree reasonably
well with other estimations. 相似文献
12.
We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons (Ξ (*) bc → Ξ (*) cc and Ω ( *) bc → Ω (*) cc ),in the limit m b,m c Λ QCD and close to the zero recoil point.The separate heavy quark spin symmetries make it possible to describe all these decays using a single form factor.We also show how these constraints can be used to test the validity of different quark model calculations.bb to bc baryon decays are also discussed. 相似文献
13.
We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons (Ξ (*) bc →Ξ (*) cc and Ω ( *) bc →Ω (*) cc ),in the limit m b,m c Λ QCD and close to the zero recoil point.The separate heavy quark spin symmetries make it possible to describe all these decays using a single form factor.We also show how these constraints can be used to test the validity of different quark model calculations.bb to bc baryon decays are also discussed. 相似文献
14.
Treating light as well as heavy pseudoscalar and vector mesons as non-relativistic quarkonia, we calculate various decay modes, including lowest QCD corrections. All decay modes studied are in good agreement with experiment, indicating that the quarkonium treatment is applicable to light mesons η, η′, π, also. Consistency of the quarkonium and current algebra treatments for the process π0 → 2λ leads to is the constituent u-quark mass, and . 相似文献
15.
16.
We calculate the meson mass spectra in a quark potential model by using the complete Fermi-Breit potential including the terms of orbit-orbit interaction, spin-orbit coupling, and tensor force interaction. We find that these terms give nontrivial contributions to the calculated meson spectra. The orbit-orbit coupling term may lead to an instability of the solution of the Schrodinger equation and should be regularized. 相似文献
17.
18.
We calculate the meson mass spectra in a quark potential model by using the complete Fermi-Breit potential including the terms of orbit-orbit interaction, spin-orbit coupling, and tensor force interaction. We find that these terms give nontrivial contributions to the calculated meson spectra. The orbit-orbit coupling term may lead to an instability of the solution of the Schr5dinger equation and should be regularized. 相似文献
19.
利用夸克模型,考虑π介子云对质子,特别是中子的形状因子的影响,计算了质子和中子的电磁形状因子.对中子的性质给予了较好的描述. 相似文献
20.
SU(3) flavor symmetry allows the decay constantsf
D
1 andf
D
2 as well asf
B
1 andf
B
1 to be equal. But due toSU(3) flavor symmetry breaking the ratiosf
B
1/f
B
2 andf
D
1/f
D
2 are deviated from unity. We have estimated these ratios in the heavy quark effective theory and obtainedf
B
1/f
B
2=0.93,f
D
1/f
D
2=0.94 and the double ratio (f
B
1/f
B
2)/(f
D
1/f
D
2)=0.99. 相似文献