RESUMO
The balance function is a new observable based on the principle that charge is locally conserved when particles are pair produced. Balance functions have been measured for charged particle pairs and identified charged pion pairs in Au+Au collisions at the square root of SNN = 130 GeV at the Relativistic Heavy Ion Collider using STAR. Balance functions for peripheral collisions have widths consistent with model predictions based on a superposition of nucleon-nucleon scattering. Widths in central collisions are smaller, consistent with trends predicted by models incorporating late hadronization.
RESUMO
Azimuthal correlations for large transverse momentum charged hadrons have been measured over a wide pseudorapidity range and full azimuth in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV. The small-angle correlations observed in p+p collisions and at all centralities of Au+Au collisions are characteristic of hard-scattering processes previously observed in high-energy collisions. A strong back-to-back correlation exists for p+p and peripheral Au+Au. In contrast, the back-to-back correlations are reduced considerably in the most central Au+Au collisions, indicating substantial interaction as the hard-scattered partons or their fragmentation products traverse the medium.
RESUMO
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Assuntos
Adulto , Feminino , Humanos , Tomografia Computadorizada por Raios X , Linfoma/diagnóstico , Linfoma/terapia , Toxoplasmose Cerebral/diagnóstico , Toxoplasmose Cerebral/terapia , Diagnóstico Diferencial , Antivirais/uso terapêutico , HIVRESUMO
OBJECTIVE: The purpose of high-risk studies is to find characteristics that allow the identification of subjects with a higher vulnerability to alcoholism. The aim of this research was to verify if the familial density criterion is useful for subtyping children of alcoholics with different neuropsychological characteristics. METHOD: A battery of neuropsychological tests was administered to 102 boys and girls of 7-15 years of age; 66 were children of alcoholics with a high (n = 32) and low (n = 34) familial density of alcoholism, and 36 were children of nonalcoholic fathers with a negative family history of the disorder. The battery included tests to assess attention, visuospatial abilities and frontal functions. RESULTS: MANCOVAs showed that high-density children scored lower than children of nonalcoholic fathers in attentional and visuospatial tasks. There were no differences between low-density and negative family history children in these cognitive domains. CONCLUSIONS: These results suggest that children of alcoholics are not a homogeneous group. Children with multigenerational alcoholism, but not children with an alcoholic father, showed reduced performance in specific cognitive areas.
