16,787 research outputs found
Does China's Trade Expansion Help African Development? - A South-South Trade Model Approach
With the aim to explain the explosive growth of trade between China and Africa, especially the impacts of China's exportation on African countries, a simple South-South trade model is constructed to formulate the idea that for a technologically backward country to improve its production capability, when there exists nontrivial substitution effects, it is better to import from a South country which has superior technology, than from a North country with enormous technological advance. Then the Comtrade panel data are used to assess the impacts of imports from China (in comparison with those from the USA and France) on Sub-Saharan African manufactured exports (as proxies of their production performances). The results confirm the inference drawn from the model.South-South trade;impact of Chinese exportation on Africa;technology spillover effects;intermediate goods;substitution effects.
A Collider for the 750 GeV Resonant State
Recent data collected by ATLAS and CMS at 13 TeV collision energy of the LHC
indicate the existence of a new resonant state with a mass of 750 GeV
decaying into two photons . The properties of should be
studied further at the LHC and also future colliders. Since only decay channel has been measured, one of the best ways to extract
more information about is to use a collider to produce
at the resonant energy. In this work we show how a
collider helps to verify the existence of and to provide some of the
most important information about the properties of , such as branching
fractions of . Here can be , , or . We
also show that by studying angular distributions of the final 's in
, one can obtain crucial information
about whether this state is a spin-0 or a spin-2 state.Comment: ReTex, 12 page with 6 figures. Expanded discussion on distinguishing
spin-0 and spin-2 cases. Several figures adde
as a virtual state from interaction
In this work, we study the and invariant mass
spectra of the decay to find out the origin of the and
structures. The interaction is studied in
a coupled-channel quasipotential Bethe-Saltpeter equation approach, and
embedded to the decay process to reproduce both and
invariant mass spectra observed at BESIII simultaneously. It is
found out that a virtual state at energy about 3870 MeV is produced from the
interaction when both invariant mass spectra are comparable with the
experiment. The results support that both and have the
same origin, that is, a virtual state from
interaction, in which the interaction is more important and the
coupling between and channels plays a minor role.Comment: 8 pages, 4 figures, more reference adde
Interpretation of as an isoscalar partner of from interaction
Invoked by the recent observation of at BESIII, which is about 40
MeV below the threshold, we investigate possible
bound and resonance states from the interaction with
the one-boson-exchange model in a quasipotential Bethe-Salpeter equation
approach. A bound state with quantum number is produced at 4384
MeV from the interaction, which can be related to
experimentally observed . Another state with quantum number
is also produced at MeV from this interaction.
Different from the state, the state is a resonance
state above the threshold. This resonance state can
be related to the first observed charged charmonium-like state , which
has a mass about 4475 MeV measured above the threshold as observed at Belle and
LHCb. Our result suggests that is an isoscalar partner of the
as a hadronic-molecular state from the
interaction.Comment: 5 pages, 1 figur
Estimating Chinese Interprovincial OutPut Spillovers with Provincial Input-Output Tables
This paper aims at estimating productivity improvement of Chinese 17 relatively backward provinces in manufactures through importing manufactured intermediates from advanced provinces on the basis of just published 2002 national and provincial input-output tables. As Chinese regional inequality remains large, North-South spillover models of trade are appropriate to guide this study. Applying reliable methods to approximate net interprovincial imports by province and sector and the allocation of imported manufactured inputs among sectors within each province, we use a Cob-Douglas production function incorporating Dixit-Stiglitz type increasing returns to variety to deal with the manufactured inputs, and treat the output spillovers as one part of total factor productivity. According to our estimations, as expected, interprovincial imports of manufactured inputs have significant impacts on industrial sectors as well on all sectors of these provinces.Chinese interprovincial trade;North-South spillovers;input-output tables;regional inequality;imported intermediates
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