Understanding the newly observed heavy pentaquark candidates

We find that several thresholds can contribute to the enhancements of the newly observed heavy pentaquark candidates $P_c^+(4380)$ and $P_c^+(4450)$ via the anomalous triangle singularity (ATS) transitions in the specific kinematics of $\Lambda_b\to J/\psi K^- p$. Apart from the observed two peaks we find that another peaks around 4.5 GeV can also be produced by the ATS. We also show that the $\Sigma_c^{(*)}$ can be produced at leading order in $\Lambda_b$ decay. This process is different from the triangle diagram and its threshold enhancement only appears as CUSP effects if there is no pole structure or the ATS involved. The threshold interaction associated with the presence of the ATS turns out to be a general phenomenon and plays a crucial role in the understanding of candidates for exotic states.Comment: 9 pages, 6 figures, 4 tables; published version in PL

Photoproduction of hidden charm pentaquark states Pc+(4380)P_c^+(4380) and Pc+(4450)P_c^+(4450)

We propose to study the pentaquark candidates of $P_c^+(4380)$ and $P_c^+(4450)$ in $J/\psi$ photoproduction and look for further experimental evidence for their nature. Since the photoproduction process does not satisfy the so-called "anomalous triangle singularity" condition their presence in $J/\psi$ photoproduction would conclude that they should be genuine states and provide further evidence for their existence.Comment: Accepted by Phys.Rev.

Further understanding of the non-DDˉD\bar D decays of ψ(3770)\psi(3770)

We provide details of the study of $\psi(3770)$ non-$D\bar D$ decays into $VP$, where $V$ and $P$ denote light vector meson and pseudoscalar meson, respectively. We find that the electromagnetic (EM) interaction plays little role in these processes, while the strong interaction dominates. The strong interaction can be separated into two parts, i.e. the short-distance part probing the wave function at origin and the long-distance part reflecting the soft gluon exchanged dynamics. The long-distance part is thus described by the intermediate charmed meson loops. We show that the transition of $\psi(3770)\to VP$ can be related to $\psi(3686)\to VP$ such that the parameters in our model can be constrained by comparing the different parts in $\psi(3770)\to VP$ to those in $\psi(3686)\to VP$. Our quantitative results confirm the findings of [Zhang {\it et al.}, Phys. Rev. Lett. 102, 172001 (2009)] that the OZI-rule-evading long-distance strong interaction via the IML plays an important role in $\psi(3770)$ decays, and could be a key towards a full understanding of the mysterious $\psi(3770)$ non-$D\bar{D}$ decay mechanism.Comment: 11 pages, 4 figures, version to appear in Phys. Rev.

After Forty Years of Reform and Opening up: A Multi-perspective Analysis of the Innovation and Development of Ideological and Political Education

In the past 40 years of reform and opening up, the political, economic and cultural exchanges and cooperation between China and other countries have been increasing. In particular, with the opening of the doors to the outside world, the intermingling and collision of various cultures and trends from the East and the West have affected the practice and development process of ideological and political education to a certain extent. With the continuous penetration of network technology, the ideological and political theoretical system under the leadership of the Party has been constantly innovated and improved. Although it has gone through the course of cancellation, restoration, development and then integration and deepening, it has also pointed out a series of new diversified development paths for ideological and political education. Therefore, against such a background, it is important to deeply understand the distinctive features of ideological and political education in the context of pluralism. Adhering to the principle of keeping pace with the times and the people-oriented education policy and exploring new paths, methods and means of ideological and political education in the context of pluralism are not only in line with the trend of development of the times, but also continue to promote the reform and development of ideological and political theory in the new era