2,318 research outputs found
The , decays in the perturbative QCD approach
Nonleptonic two body decays including radially excited or
mesons in the final state are studied using the perturbative QCD
approach based on factorization. The charmonium distribution amplitudes
are extracted from the Schrdinger states for the
harmonic oscillator potential. Utilizing these distribution amplitudes, we
calculate the numerical results of the
transition form factors and branching fractions of decays. The ratio between two decay modes and is compatible with the experimental
data within uncertainties, which indicate that the harmonic oscillator wave
functions for and work well. It is found that the
branching fraction of , which is dominated by the
twist-3 charmonium distribution amplitude, can reach the order of . We
hope it can be measured soon in the LHCb experiment.Comment: 9 pages, 3 figures,3 Table
Estudio piloto de intervención de enfermerÃa radiológica en examen de resonancia magnética 3-t
OBJETIVO Se objetivó investigar el efecto de la intervención de enfermerÃa radiológica en examen abdominal de IRM 3-T. MÉTODO Sesenta pacientes con enfermedades abdominales fueron divididos aleatoriamente en dos grupos: grupo intervención de enfermerÃa RM y grupo control. Todos fueron sometidos a examen abdominal de RM 3-T. Las intervenciones de enfermerÃa RM se efectuaron en el grupo establecido. Los resultados, incluyendo tasa de éxito en única vez, relación de imágenes de RM diagnosticables y puntos de calidad de imagen, fueron comparadas entre ambos grupos. RESULTADOS La tasa de éxito en única vez en grupo control y grupo intervención de enfermerÃa RM fueron de 66,67% y 96,67%, expresando diferencias significativas (χ2 =9.017, POBJETIVO O objetivo deste estudo foi investigar o resultado da intervenção de enfermagem na radiologia em exame de ressonância magnética (RM) abdominal 3 Tesla. MÉTODO 60 pacientes com patologias abdominais foram aleatoriamente divididos em dois grupos: grupo de intervenção de enfermagem em RM e grupo controle. Todos os pacientes foram submetidos ao exame de RM abdominal 3 Tesla. As intervenções de enfermagem em RM foram realizadas no grupo de intervenção de enfermagem. Os resultados foram comparados entre os dois grupos, incluindo a taxa de sucesso único, o coeficiente das imagens de RM diagnosticáveis e os pontos da qualidade de imagem. RESULTADOS As taxas de sucesso único no grupo controle e no grupo de intervenção de enfermagem em RM foram 66,67% e 96,67%, com diferença significativa de (χ2 =9,017, POBJECTIVE The aim of this study was to investigate the effect of radiology nursing intervention in abdominal examination at 3-T MRI. METHOD 60 patients with abdominal diseases were divided into two groups randomly: MR nursing intervention group and control group. All the patients underwent abdominal MR examination at 3-T. The MR nursing interventions were performed in nursing intervention group. The outcomes, including one-time success rate, the ratio of diagnosable MR images and the points of image quality, were compared between these two groups. RESULTS The one-time success rates in control group and MR nursing intervention group were 66.67% and 96.67% with significant difference ( χ2 =9.017,
A representation basis for the quantum integrable spin chain associated with the su(3) algebra
An orthogonal basis of the Hilbert space for the quantum spin chain
associated with the su(3) algebra is introduced. Such kind of basis could be
treated as a nested generalization of separation of variables (SoV) basis for
high-rank quantum integrable models. It is found that all the monodromy-matrix
elements acting on a basis vector take simple forms. With the help of the
basis, we construct eigenstates of the su(3) inhomogeneous spin torus (the
trigonometric su(3) spin chain with antiperiodic boundary condition) from its
spectrum obtained via the off-diagonal Bethe Ansatz (ODBA). Based on small
sites (i.e. N=2) check, it is conjectured that the homogeneous limit of the
eigenstates exists, which gives rise to the corresponding eigenstates of the
homogenous model.Comment: 24 pages, no figure, published versio
Exact solution of the Izergin-Korepin model with general non-diagonal boundary terms
The Izergin-Korepin model with general non-diagonal boundary terms, a typical
integrable model beyond A-type and without U(1)-symmetry, is studied via the
off-diagonal Bethe ansatz method. Based on some intrinsic properties of the
R-matrix and the K-matrices, certain operator product identities of the
transfer matrix are obtained at some special points of the spectral parameter.
These identities and the asymptotic behaviors of the transfer matrix together
allow us to construct the inhomogeneous T-Q relation and the associated Bethe
ansatz equations. In the diagonal boundary limit, the reduced results coincide
exactly with those obtained via other methods.Comment: 24 pages, published versio
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