5,462 research outputs found
An interactively recurrent functional neural fuzzy network with fuzzy differential evolution and its applications
In this paper, an interactively recurrent functional neural fuzzy network (IRFNFN) with fuzzy differential evolution (FDE) learning method was proposed for solving the control and the prediction problems. The traditional differential evolution (DE) method easily gets trapped in a local optimum during the learning process, but the proposed fuzzy differential evolution algorithm can overcome this shortcoming. Through the information sharing of nodes in the interactive layer, the proposed IRFNFN can effectively reduce the number of required rule nodes and improve the overall performance of the network. Finally, the IRFNFN model and associated FDE learning algorithm were applied to the control system of the water bath temperature and the forecast of the sunspot number. The experimental results demonstrate the effectiveness of the proposed method
and with the complex scaling method and three-body effect
We use the leading order (LO) contact interactions and OPE potentials to
investigate the newly observed double-charm state . The
three-body effect is important in this system since the intermediate states can
go on shell. We keep the dependence of the pion propagators on the
center-of-mass energy, which results in a unitary cut of the OPE potential at
the three-body threshold. By solving the complex scaled Schr\"odinger
equation, we find a pole corresponding to the on the physical
Riemann sheet. Its width is around 80 keV and nearly independent of the choice
of the cutoff. Assuming the and channels as the main
decay channels, we apply the similar calculations to the , and find
its width is even smaller. Besides, the isospin breaking effect is significant
for the while its impact on the is relatively small.Comment: 25 pages, 10 figures, 6 table
states and their open-charm decays with the complex scaling method
A partial width formula is proposed using the analytical extension of the
wave function in momentum space. The distinction of the Riemann sheets is
explained from the perspective of the Schrodinger equation. The analytical form
in coordinate space and the partial width are derived subsequently. Then a
coupled-channel analysis is performed to investigate the open-charm branching
ratios of the states, involving the contact interactions and
one-pion-exchange potential with the three-body effects. The low energy
constants are fitted using the experimental masses and widths as input. The
is found to decay mainly to , while the
branching ratios of the and in different channels are
comparable. Under the reasonable assumption that the off-diagonal contact
interactions are small, the quantum numbers of the and the
prefer and respectively. Three
additional states at 4380 MeV, 4504 MeV and 4516 MeV, together with their
branching ratios, are predicted. A deduction of the revised one-pion-exchange
potential involving the on-shell three-body intermediate states is performed.Comment: 16 pages, 5 figure
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