Color Transparency versus Quantum Coherence in Electroproduction of Vector Mesons off Nuclei

So far no theoretical tool for the comprehensive description of exclusive electroproduction of vector mesons off nuclei at medium energies has been developed. We suggest a light-cone QCD formalism which is valid at any energy and incorporates formation effects (color transparency), the coherence length and the gluon shadowing. At medium energies color transparency (CT) and the onset of coherence length (CL) effects are not easily separated. Indeed, although nuclear transparency measured by the HERMES experiment rises with Q^2, it agrees with predictions of the vector dominance model (VDM) without any CT effects. Our new results and observations are: (i) the good agreement with the VDM found earlier is accidental and related to the specific correlation between Q^2 and CL for HERMES kinematics; (ii) CT effects are much larger than have been estimated earlier within the two channel approximation. They are even stronger at low than at high energies and can be easily identified by HERMES or at JLab; (iii) gluon shadowing which is important at high energies is calculated and included; (iv) our parameter-free calculations explain well available data for variation of nuclear transparency with virtuality and energy of the photon; (v) predictions for electroproduction of \rho and \phi are provided for future measurements at HERMES and JLab.Comment: Latex 57 pages and 17 figure

The Wave Function of 2S Radially Excited Vector Mesons from Data for Diffraction Slope

In the color dipole gBFKL dynamics we predict a strikingly different Q^2 and energy dependence of the diffraction slope for the elastic production of ground state V(1S) and radially excited V'(2S) light vector mesons. The color dipole model predictions for the diffraction slope for \rho^0 and \phi^0 production are in a good agreement with the data from the fixed target and collider HERA experiments. We present how a different form of anomalous energy and Q^2 dependence of the diffraction slope for V'(2S) production leads to a different position of the node in radial wave function and discuss a possibility how to determine this position from the fixed target and HERA data.Comment: 20 pages and 6 figures. Title change

Alcohol Consumption and Bipolar Disorder in a Colombian Population Sample

© 2018 Asociación Colombiana de Psiquiatría Background: Bipolar disorder (BD) is reported to be the mental disorder with the highest rate of comorbidity with substance use disorders (SUD). More than half of patients with BD have been found to have disorders associated with alcohol use. Methods: A secondary analysis was performed in a population sample of Colombian adults. The aim was to identify bipolar-alcohol comorbidity and factors related to the use of alcohol in people with BD. The diagnosis of BD among participants was made with the “Composite International Diagnostic Interview” (CIDI-CAPI) and the pattern of alcohol consumption in the last year was evaluated with the AUDIT C screening tool. Results: It was found that all patients with BD had some type of problematic alcohol consumption pattern. Women with BD were at greater risk of having a dependence-type pattern, using nicotine and marijuana and, among those living in urban areas, had higher rates of suicidal ideation, although that risk was lower if they were in a stable relationship. Discussion: Some of the related factors we identified are new with respect to previous publications and others have already been described in similar studies. Conclusions: Given the importance of such factors in the management of this population and their prognosis, these findings highlight the need to determine consumption patterns of alcohol and other substances in patients with BD