The Y(4260) and Y(4360) enhancements within coupled-channels

Puzzling structures have been observed in the charmonium energy region, namely the Y(4260) and the Y(4360), that cannot be easily accommodated within quark model frameworks. The proximity of nearby dominant hadronic thresholds suggests that they play an important role in the formation of the enhancements. We present results of an unitarized effective Lagrangian model, where mesonic loops, equivalent to coupled-channels, and charmonium vectors ψ interplay to generate line-shapes and poles.

Line planning in emergencies for railway networks

Purpose – The purpose of this paper is to generate line plan in emergencies for railway networks to complete the passenger transportation. Design/methodology/approach – The authors first build a mathematical model, focusing on the frequency setting and stops setting. Then, considering the OD passenger flow data, the authors first propose the method to solve the train frequency setting problem of different types. Genetic algorithm is designed to solve the stops setting problem. The approach is tested with the data from Beijing-Shanghai high-speed railway and its neighbour existing railway. Findings – The authors find that the model is suitable to generate line plan in emergencies for railway networks and the algorithm has good calculating performance. Originality/value – The new algorithms to generate line plan proposed in this paper can be embedded in the decision support system for railway operators.