6,124 research outputs found
The role of inter-well tunneling strength on coherence dynamics of two-species Bose-Einstein condensates
Coherence dynamics of two-species Bose-Einstein condensates in double wells
is investigated in mean field approximation. We show that the system can
exhibit decoherence phenomena even without the condensate-environment coupling
and the variation tendency of the degree of coherence depends on not only the
parameters of the system but also the initial states. We also investigate the
time evolution of the degree of coherence for a Rosen-Zener form of tunneling
strength, and propose a method to get a condensate system with certain degree
of coherence through a time-dependent tunneling strength
Further understanding of the non- decays of
We provide details of the study of non- decays into
, where and 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 can be related to such that the parameters in our model
can be constrained by comparing the different parts in to
those in . 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 decays, and could be a key towards a full
understanding of the mysterious non- decay mechanism.Comment: 11 pages, 4 figures, version to appear in Phys. Rev.
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