15,873 research outputs found
Combined fit to BaBar and Belle data on e+e- to pi+pi- psi(2S)
A combined fit is performed to the BaBar and Belle measurements of the e+e-
to pi+pi-psi(2S) cross sections for center-of-mass energy between threshold and
5.5 GeV. The resonant parameters of the Y(4360) and Y(4660) are determined. The
mass is 4355^{+9}_{-10}\pm 9 MeV/c^2 and the width is 103^{+17}_{-15}\pm 11
MeV/c^2 for the Y(4360), and the mass is 4661^{+9}_{-8}\pm 6 MeV/c^2 and the
width is 42^{+17}_{-12}\pm 6 MeV/c^2 for the Y(4660). The production of the
Y(4260) in pi+pi-psi(2S) mode is found to be at 2\sigma level, and B(Y(4260) to
pi+pi-psi(2S))\Gamma_{e+e-} is found to be less than 4.3 eV/c^2 at the 90%
confidence level, or equal to 7.4^{+2.1}_{-1.7} eV/c^2 depending on it
interferes with the Y(4360) constructively or destructively. These information
will shed light on the understanding of the nature of the Y states observed in
initial state radiation processes.Comment: 8 pages, 4 figure
Large-time Behavior of Solutions to the Inflow Problem of Full Compressible Navier-Stokes Equations
Large-time behavior of solutions to the inflow problem of full compressible
Navier-Stokes equations is investigated on the half line .
The wave structure which contains four waves: the transonic(or degenerate)
boundary layer solution, 1-rarefaction wave, viscous 2-contact wave and
3-rarefaction wave to the inflow problem is described and the asymptotic
stability of the superposition of the above four wave patterns to the inflow
problem of full compressible Navier-Stokes equations is proven under some
smallness conditions. The proof is given by the elementary energy analysis
based on the underlying wave structure. The main points in the proof are the
degeneracies of the transonic boundary layer solution and the wave interactions
in the superposition wave.Comment: 27 page
Controlling soliton interactions in Bose-Einstein condensates by synchronizing the Feshbach resonance and harmonic trap
We present how to control interactions between solitons, either bright or
dark, in Bose-Einstein condensates by synchronizing Feshbach resonance and
harmonic trap. Our results show that as long as the scattering length is to be
modulated in time via a changing magnetic field near the Feshbach resonance,
and the harmonic trapping frequencies are also modulated in time, exact
solutions of the one-dimensional nonlinear Schr\"{o}dinger equation can be
found in a general closed form, and interactions between two solitons are
modulated in detail in currently experimental conditions. We also propose
experimental protocols to observe the phenomena such as fusion, fission, warp,
oscillation, elastic collision in future experiments.Comment: 7 pages, 7 figure
- …