37,358 research outputs found
correction to at factories
We investigate the correction to the process in the nonrelativistic QCD (NRQCD) factorization
approach. Within some reasonable choices of the relative order- NRQCD
matrix elements, we find that including this new ingredient of correction only
mildly enhances the existing NRQCD predictions. We have also deduced the
asymptotic expressions for the short-distance
coefficients, and reconfirm the early speculation that at next-to-leading order
in , the double logarithm of type appearing in
various NRQCD short-distance coefficients is always associated with the
helicity-suppressed channels.Comment: v3, 6 pages, 2 figures, 1 table; matching the published versio
Some recent progress in understanding exclusive double charmonium production at factories
We review some recent progress in understanding various exclusive double
charmonium production processes at factories, within the nonrelativistic
QCD factorization framework. First we investigate the impact of the joint
perturbative and relativistic correction on the process that has attracted a
great amount of attention in the past decade, . We
then briefly discuss the phenomenological implication of the next-to-leading
order perturbative correction to the processes . We further emphasize a novel theoretical challenge, which is
recently discovered by applying the NRQCD factorization approach to the
helicity-suppressed hard exclusive reactions involving heavy quarkonium.Comment: 9 pages, 2 figures, 1 table. Talk given by Y. J. at the Xth Quark
Confinement and the Hadron Spectrum, 8-12 October 2012, TUM Campus Garching,
Munich, German
Some sharp inequalities involving Seiffert and other means and their concise proofs
In the paper, by establishing the monotonicity of some functions involving
the sine and cosine functions, the authors provide concise proofs of some known
inequalities and find some new sharp inequalities involving the Seiffert,
contra-harmonic, centroidal, arithmetic, geometric, harmonic, and root-square
means of two positive real numbers and with .Comment: 10 page
Spin-Liquid State for Two-Dimensional Heisenberg Antiferromagnets on a Triangular Lattice
The spin liquid state of the antiferromagnetic Heisenberg model on a
triangular lattice is studied within the self-consistent Green's function
method. It is shown that the spin excitation spectra is gapless, and
ground-state energy per site is , which is in very good
agreement with the results obtained within the variational Monte Carlo method
based on the resonating-valence-bond state. Some thermodynamic properties are
also discussed.Comment: 4 pages, Revtex, Three figures are not included, and can be obtained
by request ([email protected]
- β¦