7,534 research outputs found
OPEN REGIONALISM IN APEC: IMPACTS ON U.S. AGRICULTURE AND TRADE
APEC's "open regionalism" calls for free-trade in APEC but with benefits also accruing to non-APEC members. This study shows that "open regionalism" provides strong incentives for non-APEC economies to also liberalize their policies to maintain competitiveness. Inclusion of agriculture is critical to total U.S. welfare gains because of current high protection rates in East Asia.Institutional and Behavioral Economics, International Relations/Trade,
Controlling quantum state transfer in spin chain with the confined field
As a demonstration of the spectrum-parity matching condition (SPMC) for
quantum state transfer, we investigate the propagation of single-magnon state
in the Heisenberg chain in the confined external tangent magnetic field
analytically and numerically. It shows that the initial Gaussian wave packet
can be retrieved at the counterpart location near-perfectly over a longer
distance if the dispersion relation of the system meets the SPMC approximately.Comment: 9 pages, 8 figure
Search for charmonium and bottomonium states in at B factories
We study the production of charmonium states in at B factories with (n=1,2,3), (m=1,2), and
. In the S and P wave case, contributions of tree-QED with one-loop
QCD corrections are calculated within the framework of nonrelativistic
QCD(NRQCD) and in the D-wave case only the tree-QED contribution are
considered. We find that in most cases the QCD corrections are negative and
moderate, in contrast to the case of double charmonium production , where QCD corrections are positive and large in most cases. We
also find that the production cross sections of some of these states in
are larger than that in by an
order of magnitude even after the negative QCD corrections are included. So we
argue that search for the X(3872), X(3940), Y(3940), and X(4160) in at B factories may be helpful to clarify the nature of these
states. For completeness, the production of bottomonium states in
annihilation is also discussed.Comment: 13pages, 4 figure
- …