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 共查询到20条相似文献,搜索用时 15 毫秒
1.
The P-wave charm-strange mesons Ds0(2317) and Ds1(2460) lie below the DK and D* K threshold respectively. They are extremely narrow because their strong decays violate the isospin symmetry. We study the possible heavy molecular states composed of a pair of excited charm strange mesons. As a byproduct, we also present the numerical results for the bottonium-like analogue.  相似文献   

2.
3.
We perform a systematical study of possible molecular states composed of the S wave heavy light mesons,where the S–D mixing and η-η' mixing are explicitly included.Our calculation indicates that the observed X(3872) could be a loosely shallow molecular state composed of D*+ h.c,while neither Z_c(3900)/Z_c(4020) nor Z_b(10610)/Z_b(10650) is supported to be a molecule.Some observed possible molecular states are predicted,which could be searched for by further experimental measurements.  相似文献   

4.
Muyang Chen 《中国物理C(英文版)》2021,45(12):123104-123104-6
In this study, the first radial excited heavy pseudoscalar and vector mesons (\begin{document}$\eta_c(2S)$\end{document}, \begin{document}$\psi(2S)$\end{document}, \begin{document}$B_c(2S)$\end{document}, \begin{document}$B^*_c(2S)$\end{document}, \begin{document}$\eta_b(2S)$\end{document}, and \begin{document}$\varUpsilon(2S)$\end{document}) are investigated using the Dyson-Schwinger equation and Bethe-Salpeter equation approach. It is shown that the effective interactions of the radial excited states are harder than those of the ground states. With the interaction well determined by fitting the masses and leptonic decay constants of \begin{document}$\psi(2S)$\end{document} and \begin{document}$\varUpsilon(2S)$\end{document}, the first radial excited heavy mesons could be quantitatively described in the rainbow ladder approximation. The masses and leptonic decay constants of \begin{document}$\eta_c(2S)$\end{document}, \begin{document}$B_c(2S)$\end{document}, \begin{document}$B^*_c(2S)$\end{document}, and \begin{document}$\eta_b(2S)$\end{document} are predicted.  相似文献   

5.
王登霞  张爱林 《中国物理 C》2010,34(9):1387-1389
The spectrum of D s mesons is systematically studied in a semi-classic mass loaded flux tube model.D s in D-wave multiplets is predicted to have lower masses in comparison with most theoretical predictions.D sJ (2632) +,D s1 (2700) ±,D sJ (2860) + and D sJ (3040) + are interpreted in the constituent quark model.  相似文献   

6.
The spectrum of D s mesons is systematically studied in a semi-classic mass loaded flux tube model.D s in D-wave multiplets is predicted to have lower masses in comparison with most theoretical predictions.D sJ (2632) +,D s1 (2700) ±,D sJ (2860) + and D sJ (3040) + are interpreted in the constituent quark model.  相似文献   

7.
Using the one-boson-exchange model, we studied the possible existence of very loosely bound hidden-charm molecular baryons composed of an anti-charmed meson and a charmed baryon. Our numerical results indicate that the ΣcD* and ΣcD states exist, but that the ΛcD and ΛcD* molecular states do not.  相似文献   

8.
9.
D Mishra  C V Sastry 《Pramana》1981,16(4):359-367
In a non-relativistic quark model, by parametrizing the quark-antiquark potentials, some mass relations have been obtained. Algebraic expressions for the masses of higher flavour meson isosinglets have been given in terms of the meson masses of lower symmetries. Hallock and Oneda’s contention of two types of sumrules for nonet mesons in SU(3) has been examined and the possibilities of such different sum-rules of this type in SU(4) and SU(5) have been explored.  相似文献   

10.
N Barik  S Kar  P C Dash 《Pramana》1997,48(5):985-995
We investigate the weak leptonic decays of light and heavy pseudoscalar mesons in a relativistic quark model of independent quarks. We perform a static calculation of the decay constantf M purely on grounds of simplicity. In order to minimize the possible uncertainty in the static calculation, we estimate the ratios of the decay constants which are found to be in good agreement, in the heavy flavor sector, with the predictions of other models available in the literature and existing experimental data. However, there is a noticeable discrepancy in the current prediction for pion decay constant which demonstrates the inherent limitations of the static approximation in the study of non-strange light mesons.  相似文献   

11.
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   

12.
We discuss a possible interpretation of the , Ds1(2460), and Bs1(5778) mesons as hadronic molecules. Using an effective Lagrangian approach we calculate their weak, strong and radiative decays. The new impact of the molecular structure of these states is the presence of u(d) quarks in the K, D(∗) and B(∗) mesons which gives rise to the direct strong isospin-violating transitions and in addition to the modes generated by ηπ0 mixing as was considered before in the literature.  相似文献   

13.
莫宇翔  杨杰  李丽 《物理》2006,35(5):390-392
分子激发态光谱和动力学对于了解分子的电子结构及电子运动、核振动和分子转动之间的相互作用有重要的意义.我们建立起了一套红外-红外双共振实验平台,开展了碱金属双原子分子微扰增强双共振研究,取得了一些重要结果.利用XUV激光结合高分辨光电子能谱的方法,我们研究了一些重要分子离子的光谱,如:CH3CN^+/CD3CN^+的电子运动与核振动之间的相互作用(Jahn-Teller效应).  相似文献   

14.
莫宇翔  杨杰  李丽 《物理》2006,35(05):390-392
分子激发态光谱和动力学对于了解分子的电子结构及电子运动、核振动和分子转动之间的相互作用有重要的意义.我们建立起了一套红外-红外双共振实验平台,开展了碱金属双原子分子微扰增强双共振研究,取得了一些重要结果.利用XUV激光结合高分辨光电子能谱的方法,我们研究了一些重要分子离子的光谱,如:CH3CN+/CD3CN+ 的电子运动与核振动之间的相互作用(Jahn-Teller 效应).  相似文献   

15.
魏科伟  陈兵  王振洋  祁敬娟  陈新云  翁铭华 《物理学报》2013,62(18):181101-181101
在Regge唯象下, 首先研究自旋-宇称多重态中六个介子质量间的关系式. 运用验证后的关系式, 重点计算基态矢量介子多重态(13S1)中尚未观测到的双重粲-底介子 Bc*的质量. 还计算了径向激发态23S1多重态的介子质量和轨道激发态13G5介子九重态的质量. 根据计算结果结合实验数据和其他理论进行讨论, 建议在6355 MeV附近寻找和研究 Bc*介子, 将 D(2600)和 Ds1(2700)分别作为主要成分为 nc(23S1)和 sc(23S1)的态进行研究; 分别在5812, 5917, 6896 MeV附近寻找矢量介子第一径向激发态 B*(2S), Bs*(2S)和 Bc*(2S). 建议将 ω5(2250)安排在13G5介子九重态的同位旋标量态, 实验上在2259 MeV附近进一步研究 ρ5(2350)的性质, 在2438 MeV附近寻找和研究 φ5(13G5). 研究结果对于相关介子的自旋-宇称安排和通过实 验寻找新的介子激发态具有重要的参考价值. 关键词: Regge唯象 矢量介子 质量谱  相似文献   

16.
We summarize the consequences of the infinite limit of heavy quark mass in the results of form factors, charge radii and decay constants of heavy light mesons within a QCD inspired quark model recently reported.  相似文献   

17.
18.
In this study, we systematically investigated two-pseudoscalar meson systems with the Bethe-Salpeter equation in the ladder and instantaneous approximations. By solving the Bethe-Salpeter equation numerically with the kernel containing the one-particle exchange diagrams, we found that the \begin{document}$ K\bar{K} $\end{document}, \begin{document}$ DK $\end{document}, \begin{document}$ B\bar{K} $\end{document}, \begin{document}$ D\bar{D} $\end{document}, \begin{document}$ B\bar{B} $\end{document}, \begin{document}$ BD $\end{document}, \begin{document}$ D\bar{K} $\end{document}, \begin{document}$ BK $\end{document}, and \begin{document}$ B\bar{D} $\end{document} systems with \begin{document}$ I=0 $\end{document} can exist as bound states. We also studied the contributions from heavy meson (\begin{document}$ J/\psi $\end{document} and \begin{document}$\Upsilon $\end{document}) exchanges and found that the contributions from heavy meson exchanges cannot be ignored.  相似文献   

19.
利用Davidson修正的内收缩多参考组态相互作用(MRCI+Q)方法,结合相关一致全电子基aug-cc-pw CV5Z优化计算了MgH分子5个低激发电子态(5Λ–S)的势能曲线.为了得到高精确的光谱性质,计算中引入核价电子相关和相对论效应修正.利用LEVEL8.0程序拟合修正的Λ-S束缚态的势能曲线,得到了相应的光谱常数、振动能级和分子常数,结果与近来的理论计算相比,本文的数值更接近实验值.这些结果说明高精度的计算方法和引入相关修正对分析光谱性质是非常必要的,为进一步研究MgH分子高激发态的光谱和跃迁特性提供可靠的实验和理论参考.  相似文献   

20.
利用Davidson修正的内收缩多参考组态相互作用(MRCI+Q)方法,结合相关一致全电子基aug-cc-pwCV5Z优化计算了MgH分子5个低激发电子态(5Λ–S)的势能曲线. 为了得到高精确的光谱性质,计算中引入核价电子相关和相对论效应修正. 利用LEVEL8.0程序拟合修正的Λ-S束缚态的势能曲线,得到了相应的光谱常数、振动能级和分子常数,结果与近来的理论计算相比,本文的数值更接近实验值. 这些结果说明高精度的计算方法和引入相关修正对分析光谱性质是非常必要的,为进一步研究MgH分子高激发态的光谱和跃迁特性提供可靠的实验和理论参考.  相似文献   

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