6,616 research outputs found
Analysis of the tensor-tensor type scalar tetraquark states with QCD sum rules
In this article, we study the ground states and the first radial excited
states of the tensor-tensor type scalar hidden-charm tetraquark states with the
QCD sum rules. We separate the ground state contributions from the first radial
excited state contributions unambiguously, and obtain the QCD sum rules for the
ground states and the first radial excited states, respectively. Then we search
for the Borel parameters and continuum threshold parameters according to four
criteria and obtain the masses of the tensor-tensor type scalar hidden-charm
tetraquark states, which can be confronted to the experimental data in the
future.Comment: 12 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1607.0484
The decay width of the as an axialvector tetraquark state in solid quark-hadron duality
In this article, we tentatively assign the to be the
diquark-antidiquark type axialvector tetraquark state, study the hadronic
coupling constants , , with the QCD sum rules in details. We take into account both the
connected and disconnected Feynman diagrams in carrying out the operator
product expansion, as the connected Feynman diagrams alone cannot do the work.
Special attentions are paid to matching the hadron side of the correlation
functions with the QCD side of the correlation functions to obtain solid
duality, the routine can be applied to study other hadronic couplings directly.
We study the two-body strong decays ,
, , and obtain the total
width of the . The numerical results support assigning the
to be the diquark-antidiquark type axialvector tetraquark
state, and assigning the to be the meson-meson type axialvector
molecular state.Comment: 16 pages, 3 figure
Study on Problems Faced by Xinjiang Organic Producers and Solutions
Presently the behavioral features of the organic producers could be concluded as the fact that they are quite confident of the prospects for organic agriculture, while heavily dependent on the guidance and support of the local governments; are in great demand for technological innovation, while in the distinguished intimacy and poor pricing capacity. Such problems as low economic benefit, the imperfect marketing network and serious external economy, are threatening the healthy development of organic agriculture in Xinjiang. In this essay, it is suggested that the government should, taking full advantage of its rich natural resources, pay great attention to the organic development in the local region; establish an efficient organic marketing network; apply the innovation mechanism as a proper compensation for the external economy; promote organic circle economy.organic agriculture, problems, policy inspiration, Xinjiang, Farm Management,
Cosmological CPT Violation, Baryon/Leptogenesis and CMB Polarization
In this paper we study the cosmological CPT-violation and its implications in
baryo/leptogenesis and CMB polarization. We propose specifically a variant of
the models of gravitational leptogenesis. By performing a global analysis with
the Markov Chain Monte Carlo (MCMC) method, we find the current CMB
polarization observations from the three-year WMAP (WMAP3) and the 2003 flight
of BOOMERANG (B03) data provide a weak evidence for our model. However to
verify and especially exclude this type of mechanism for baryo/leptogenesis
with cosmological CPT-violation, the future measurements on CMB polarization
from PLANCK and CMBpol are necessary.Comment: The version appears in PL
- …