175 research outputs found
The and mass of light-quark hybrid in QCD sum rules
We calculate masses of the light-quark hybrid mesons with the quantum number
and by using the QCD sum rules. Two kinds of the interpolated
currents with the same quantum number are employed. We find that the
approximately equal mass is predicted for the hybrid state from the
different current and the different mass is obtained for the hybrid
state from the different current. The prediction depends on the interaction
between the gluon and quarks in the low-lying hybrid mesons. The mixing effect
on the mass of the light-quark hybrid meson through Low-energy theorem has been
examined too, and it is found that this mixing shifts the mass of hybrid meson
and glueball a little.Comment: 11 pages, Latex, 5 ps figure
Reexamination of the resonance contributions in B->X_s e^+ e^-
With help of the recent developments in the heavy quarkonium physics, we
reexamine the long distance(LD) effects in \Bsee dominantly from the charmonium
resonances and through the decay chains B\ra X_s
J/\Psi (\Psi^{\prime}) \ra X_s e^+ e^-. We find that the resonance to
nonresonance interference are reduced substantially.Comment: Revtex file,11 pages,1 figures,Phys.Lett.B in pres
Possible bound state of the double heavy meson-baryon system
We calculate the two-pion exchange potential between a heavy meson and a
heavy baryon. We find this potential is as strong as the one-pion exchange
potential between two heavy mesons and is enough to bind .
Though our result is sensitive to the cut-off, the value of the cut-off is in
the reasonable region.Comment: 11 pages, 3 figures, replace the old verson which does not correspond
to the published versio
Nonfactorization Effects in Inclusive Decay B->J/\Psi X_s
We discuss the nonfactorization effects in , which is
similar to the nonperturbative effect found by Voloshin in the decay . The QCD sum rule has been used to estimate the hadron matrix
elements. We find that the correction from this effect is very large and the
large discrepancy between the theory and the experimental data can be reduced
considerably.Comment: LaTex, 9 pages, 4 figures. Two references added and typo correcte
Experimental study and mass transfer modelling for extractive desulfurization of diesel with ionic liquid in microreactors
Conventional hydrodesulfurization technology was limited to treat aromatic heterocyclic sulfur compounds in ultralow-sulfur diesel. Extractive desulfurization (EDS) using ionic liquid (IL) exhibited good performance to address these issues, except for its long extraction time (15-40 min). To address this, microreactor was adopted to intensify the IL-based EDS, where dibenzothiophene was extracted from model diesel (MD) as the continuous phase to 1-butyl-3-methylimidazolium tetrafluoroborate as the dispersed phase under segmented flow (which appeared preferably at capillary numbers lower than 0.01). The effects of temperature, residence time and flow rate ratio on the desulfurization efficiency were investigated. The extraction equilibration time could be shortened from more than 15 min in conventional batch extractors to 120 s in microreactors. The extraction process was modeled according to the two-film model applied within a unit cell of the segmented flow, where the mass transfer resistance was considered primarily on the film side of the IL droplet. The mechanism for the improved EDS performance at higher temperatures or larger IL to MD flow ratios was investigated and validated, which was related to the significant increase in the diffusion coefficient or the specific interfacial area. These findings may shed important insights into the precise manipulation of IL-based EDS for a better process design and reactor optimization
Probe New Physics in Leptonic Decays at CERN LHC
With respect to large samples of mesons expected to be produced at CERN
Large Hadron Collider(LHC) and the large branching ratios and , we suggest that purely
leptonic decays could offer an unique probe of the standard model and its
extensions such as two Higgs doublet models and models involving supersymmetry,
and also the structure of charged weak currents.Comment: LaTeX file, 9 pages, 3 figures, final version to be published in
Phys.Lett.
Interferon-β-induced miR-155 inhibits osteoclast differentiation by targeting SOCS1 and MITF
AbstractIFN-β is induced via a c-fos dependent mechanism that is present downstream of the receptor activator of NF-κB ligand (RANKL)-RANK signal transduction cascade during osteoclast differentiation. Increased production of IFN-β in turn inhibits osteoclastogenesis. However, the mechanism by which IFN-β exerts its suppressive function remains unclear. In the present study, we found that miR-155, an IFN-β-induced miRNA, mediated the suppressive effect of IFN-β on osteoclast differentiation by targeting SOCS1 and MITF, two essential regulators of osteoclastogenesis. These findings have not only demonstrated that miR-155 inhibits osteoclast differentiation, but also provided a new therapeutic target for treatment of osteoclast-mediated diseases
- …