We compare contributions from the triangle diagram and the DD * bubble chain with the processes of e + e − → J/ψπ + π − and e + e − → (DD * ) ∓ π ± . By fitting the J/ψπ maximum spectrum and the DD * spectrum, we find that the triangle diagram cannot explain the new experimental results from BESIII Collaboration at center of mass at 4.23 and 4.26 GeV, simultaneously. On the contrary, the molecular assignment of Z c (3900) gives a much better description.
We compare contributions from the triangle diagram and the D D * bubble chain to the processes of e + e − → J/ψπ + π − and e + e − → (D D * ) ∓ π ± . By fitting the J/ψπ maximum spectrum and the D D * spectrum, we find that the triangle diagram cannot explain the new experimental results from BESIII Collaboration at center of mass at 4.23GeV and 4.26GeV, simultaneously. On the contrary, the molecular assignment of Zc(3900) gives a much better description.
We present a complete study of the associated production of the η c meson with light hadrons in e + e − collisions at the B-factory energy, which is demonstrated to be one of the best laboratories for testing the colour-octet (CO) mechanism. The colour-singlet contributions are evaluated up to O(α 2 α 3 s ), while the CO ones are evaluated up to O(α 2 α 2 s ). For the first time, the angular distribution of the 1 S [8] 0 production is studied at QCD next-to-leading order. We find that the 1 S [8] 0 channel dominates the total cross section, while the 1 P [8] 1 one exhibits its importance in the angular distribution, which turns out to be downward going with respect to cosθ . This can be considered as the most distinct signal for the CO mechanism.
The spontaneous formation of lattice structure of quantized vortices is a characteristic feature of superfluidity in closed systems under thermal equilibrium. In exciton-polariton Bose-Einstein condensate, which is a typical example of macroscopic quantum state in open systems, spontaneous vortex lattices have also been proposed by not yet observed. Here, we take into account the finite decay rate of exciton reservoir, and theoretically investigate the vortex structures in circularly pumped polariton Bose-Einstein condensate. Our results show that a decreasing reservoir decay rate can reduce the number of vortices and destabilize the lattice structure, hence is unfavorable to the formation and observation of vortex lattices. These detrimental effects can be prevailed by applying an external angular momentum.
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