Deeply-virtual Compton scattering at the next-to-next-to-leading order

Deeply-virtual Compton scattering gives access to the generalized parton distributions that encode the information on the transverse position of quarks and gluons in the proton in dependence in their longitudinal momentum. In anticipation of the high-precision experimental data in a broad kinematic range from the Electron-Ion Collider, we have calculated the two-loop, next-to-next-to-leading (NNLO) DVCS coefficient functions associated with the dominant Compton form factors $\mathcal H$ and $\mathcal E$ at large energies. The NNLO correction to the imaginary part of $\mathcal H$ appears to be rather large, up to factor two at the input scale $Q^2=4$ GeV$^2$ for simple GPD models, due to a cancellation between quark and gluon contributions.Comment: 9 pages, 3 figure

Deeply Virtual Compton Scattering at Next-to-Next-to-Leading Order

Deeply virtual Compton scattering gives access to the generalized parton distributions that encode the information on the transverse position of quarks and gluons in the proton with dependence on their longitudinal momentum. In anticipation of the high-precision experimental data in a broad kinematic range from the Electron-Ion Collider, we have calculated the two-loop, next-to-next-to-leading order (NNLO) deeply virtual Compton scattering coefficient functions associated with the dominant Compton form factors H and E at large energies. The NNLO correction to the imaginary part of H appears to be rather large, up to factor 2 at the input scale Q2=4  GeV2 for simple generalized parton distribution models, due to a cancellation between quark and gluon contribution

Costs of Clearing Land on Minnesota Farms

This archival publication may not reflect current scientific knowledge or recommendations. Current information available from University of Minnesota Agricultural Experiment Station: http://www.maes.umn.edu

What are the implications of the spontaneous spleno-renal shunts in liver cirrhosis?

<p>Abstract</p> <p>Background</p> <p>Although significant advances are expected to be made in the assessment of the portal hypertension-related complications, the prognostic role of spleno-renal shunts has not been fully explored so far. Clarifying this aspect could help tackle the life-treating events occurring in patients suffering from liver cirrhosis. The aim of the study was to analyze the relationships between the spleno-renal shunts presence at doppler ultrasound and the liver cirrhosis complications.</p> <p>Methods</p> <p>Design: eighty one patients out of 129 formed the study population (35 females). Chronic liver damage in these patients was caused by HCV (66), HBV (2), alcohol abuse (2) or unknown etiology, likely non-alcoholic steatohepatitis (11). Setting: two Liver Units of university/primary hospitals in Southern Italy. Main outcome measures: grading of esofageal varices; detection of ascites: assessment of hepatic encephalopathy; evaluation of liver cirrhosis severity; tracking hepatocellular carcinoma; doppler features of spleno-renal shunts and splenic flow velocity; spleen longitudinal diameter at sonography.</p> <p>Results</p> <p>The prevalence of spleno-renal shunts was 18.5%, without no difference concerning the etiology (HCV versus non-HCV, p = 0.870); the prevalence of hepatocellular carcinoma in patients with spleno-renal shunts was superior to that of patients without them (Pearson Chi-square, p = 0.006, power of sample size 74%), also after adjustment for liver decompensation (p = 0.024). The median score of hepatic encephalopathy in patients with and without spleno-renal shunts was similar, i.e., 0 (range, 0-2) versus 0 (0 - 3), p = 0.67. The median splenic vein flow velocity in patients with spleno-renal shunts was significantly inferior to that of patients without them, i.e., 13 cm/sec (95% confidence intervals, 6-18) versus 21 cm/sec (17-24), p < 0.0001. By far the largest percentage of large esophageal varices was in patients without spleno-renal shunts (p = 0.005). In contrast, the frequency of ascites and hepatic encephalopathy severity was overlapping in the two groups. BMI values but not Child-Pugh's classification predicted spleno-renal shunts (Ors = 1.84, 95% confidence intervals = 1.28-2.64, p = 0.001 and 1.145, 95% confidence intervals = 0.77-1.51, p = 0.66).</p> <p>Conclusion</p> <p>Taking into consideration the relatively small sample size, patients with spleno-renal shunts are burdened by an increased incidence of hepatocellular carcinoma. BMI predicted the spleno-renal shunts presence.</p

Narcissism &amp; Self-Conscious Emotion Traits

This study tested hypotheses regarding possible differential relationships of grandiose and vulnerable narcissism with guilt- and shame-related traits, specifically guilt- and shame-proneness and guilt and shame aversion. Based on existing literature, we predicted that grandiose narcissism would be negatively or non-significantly associated with guilt-proneness, shame-proneness, guilt aversion, and shame aversion. By contrast, we hypothesized that vulnerable narcissism would be negatively or non-significantly associated with guilt-proneness and guilt aversion, while being positively associated with shame-proneness and shame aversion. This study also (1) examined the relevance of these guilt and shame variables after accounting for broader, related constructs (i.e. trait negative affect and experiential avoidance), and (2) explored the interactions between proneness and aversion variables, as such interaction have been found to be important in relation to other outcomes in past research.Data were collected from 688 undergraduates over the course of two semesters. All variables were assessed using self-report questionnaires.Notable results include that:&gt; A significant two-way interaction was found between guilt-proneness and guilt aversion for grandiose narcissism, indicating that greater grandiose narcissism was associated with lower propensities for guilt, but only when tolerance for guilt was high (i.e. guilt aversion was low).&gt; After accounting for trait negative affect and experiential avoidance, both narcissism dimensions were negatively associated with guilt-proneness.&gt; Additionally, after accounting for covariates, vulnerable narcissism was positively associated with both shame-proneness and shame aversion.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Narcissism &amp; Self-Conscious Emotion Reactivity

This study tested hypotheses regarding narcissism dimensions -- grandiose and vulnerable narcissism -- and their relationship to state emotional reactivity following an interpersonal stressor (using a guided imagery task). After completing trait measures of the narcissism dimensions and a state measure of specific emotions -- guilt, shame, anger, anxiety, and sadness -- all participants listened to the guided imagery task and imagined themselves as the main character in the story. They then completed the state emotion measure again. We hypothesized that the interpersonal nature of the task would contribute to increases in self-conscious emotions among the participants as a whole. Additionally, past research suggests that grandiose narcissism should be associated with increases in anger, anxiety, and sadness, with vulnerable narcissism likely being associated with increases in anger. We also hypothesized that grandiose narcissism would be negatively associated with guilt following the interpersonal stressor; we expected no association between grandiose narcissism and shame following the interpersonal stressor. By comparison, we hypothesized that vulnerable narcissism would be positively associated with shame following the interpersonal stressor but negatively associated with post-stressor guilt.Participants in this study included 142 undergraduates.Notable results include:&gt; The interpersonal stressor was associated with increases in shame, anger, and sadness -- but not guilt or anxiety.&gt; After accounting for pre-task levels of the respective emotion, greater grandiose narcissism was associated with lower guilt reactivity.&gt; By comparison, greater vulnerable narcissism was associated with heightened guilt reactivity and shame reactivity.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

The axial-vector contributions in two-photon reactions: pion transition form factor and deeply-virtual Compton scattering at NNLO in QCD

Using the approach based on conformal symmetry we calculate the two-loop coefficient function for the axial-vector contributions to two-photon processes in the $\overline{\rm MS}$ scheme. This is the last missing element for the complete next-to-next-to-leading order (NNLO) calculation of the the pion transition form factor $\gamma^\ast\gamma\to \pi$ in perturbative QCD. The corresponding high-statistics measurement is planned by the Belle II collaboration and will allow one to put strong constraints on the pion light-cone distribution amplitude. The calculated NNLO corrections prove to be rather large and have to be taken into account. The same coefficient function determines the contribution of the axial-vector generalized parton distributions to deeply-virtual Compton scattering which is investigated at the JLAB 12 GeV accelerator, by COMPASS at CERN, and in the future will be studied at the Electron Ion Collider EIC