Dispersive analysis of omega --> 3pi and phi --> 3pi decays

We study the three-pion decays of the lightest isoscalar vector mesons, omega and phi, in a dispersive framework that allows for a consistent description of final-state interactions between all three pions. Our results are solely dependent on the phenomenological input for the pion-pion P-wave scattering phase shift. We predict the Dalitz plot distributions for both decays and compare our findings to recent measurements of the phi --> 3pi Dalitz plot by the KLOE and CMD-2 collaborations. Dalitz plot parameters for future precision measurements of omega --> 3pi are predicted. We also calculate the pi-pi P-wave inelasticity contribution from omega-pi intermediate states.Comment: 23 pages, 18 figures; discussion extended, Appendix D added, matches version published in EPJ

The Black Laws of Oregon

For a state whose Negro population has always been tiny, Oregon has devoted a surprising amount of political energy to the question of what the status of Negroes in the state and nation should be. The actions and arguments of its legislative bodies have more or less followed the national patterns, reflecting the ebb and flow of the United States\u27 concern as a whole with Negroes\u27 place in this society. Before the Civil War, and again during Reconstruction, whites in Oregon were preoccupied with the Negro Problem, as was the rest of the country. During the establishment of the system of segregation in the South, between 1890 and 1920, the matter came up again in the state. More recently, legislative action has mirrored the Civil Rights movement. One of the ways in which white Oregonians attempted to deal with the question of Negro status prior to the Civil War was by avoiding Negroes. This was the idea behind a series of proposals in the 1840\u27s and 1850\u27s to exclude Negroes from the region. The movement culminated in the establishment, by popular vote, of a clause in the state constitution prohibiting free Negroes from residing in Oregon, owning property there, or making contracts or maintaining legal actions in the state. Such enactments were peculiar to Oregon; several states in the Mississippi Valley and the Old Northwest tried similar measures.1 Oregon\u27s situation was unusual, though, in that there were so few Negroes in the territory and no large number of either free Negroes or slaves within 2,000 miles. Since most of Oregon\u27s white settlers lived in the Mississippi Valley before migrating to Oregon, it has been assumed that they were expressing attitudes formed before migration. Local situations, however, also played an important part in the development of the territory\u27s black laws. This study proposes to trace the history of Oregon\u27s legislation concerning Negroes, with particular reference to the exclusion laws, from the first such proposal in 1843 to the final repeal of the anti-Negro provisions of the state constitution in 1926-27.2 The causes, development, nature, and effects of such legislation will be examined and compared with Oregon\u27s expressions of opinion on national matters such as the Reconstruction amendments and the development of Jim Crow laws in the South. From this investigation some conclusions will be drawn about the nature of white Oregonians\u27 attitudes toward Negroes

An Empirically-Based Taxonomy of Dutch Manufacturing: Innovation Policy Implications

The paper studies the degree of homogeneity of innovative behavior in order to determine empirically an industry classi¯cation of Dutch manufacturing that can be used for policy purposes. We use a two-limit tobit model with sample selection, which explains the decisions by business enterprises to innovate and the impact these decisions have on the share of innovative sales. The model is estimated for eleven industries based on the Dutch Standard Industrial Classification (SBI 1993). A likelihood ratio test (LR) is then performed to test for equality of the parameters across industries. We find that Dutch manufacturing consists of three groups of industries in terms of innovative behavior, a high-tech group, a low-tech group and the industry of wood, where firms seem to have a rather different innovative behavior from the remaining industries. The same pattern shows up in the three Dutch Community Innovation Surveys.mathematical economics and econometrics ;

Dispersive analysis of the pion transition form factor

We analyze the pion transition form factor using dispersion theory. We calculate the singly-virtual form factor in the time-like region based on data for the $e^+e^-\to 3\pi$ cross section, generalizing previous studies on $\omega,\phi\to3\pi$ decays and $\gamma\pi\to\pi\pi$ scattering, and verify our result by comparing to $e^+e^-\to\pi^0\gamma$ data. We perform the analytic continuation to the space-like region, predicting the poorly-constrained space-like transition form factor below 1 GeV, and extract the slope of the form factor at vanishing momentum transfer $a_\pi=(30.7\pm0.6)\times 10^{-3}$. We derive the dispersive formalism necessary for the extension of these results to the doubly-virtual case, as required for the pion-pole contribution to hadronic light-by-light scattering in the anomalous magnetic moment of the muon.Comment: 13 pages, 5 figures, journal versio

Comparing Robot and Human guided Personalization: Adaptive Exercise Robots are Perceived as more Competent and Trustworthy

Schneider S, Kummert F. Comparing Robot and Human guided Personalization: Adaptive Exercise Robots are Perceived as more Competent and Trustworthy. INTERNATIONAL JOURNAL OF SOCIAL ROBOTICS. 2020.Learning and matching a user's preference is an essential aspect of achieving a productive collaboration in long-term Human-Robot Interaction (HRI). However, there are different techniques on how to match the behavior of a robot to a user's preference. The robot can be adaptable so that a user can change the robot's behavior to one's need, or the robot can be adaptive and autonomously tries to match its behavior to the user's preference. Both types might decrease the gap between a user's preference and the actual system behavior. However, the Level of Automation (LoA) of the robot is different between both methods. Either the user controls the interaction, or the robot is in control. We present a study on the effects of different LoAs of a Socially Assistive Robot (SAR) on a user's evaluation of the system in an exercising scenario. We implemented an online preference learning system and a user-adaptable system. We conducted a between-subject design study (adaptable robot vs. adaptive robot) with 40 subjects and report our quantitative and qualitative results. The results show that users evaluate the adaptive robots as more competent, warm, and report a higher alliance. Moreover, this increased alliance is significantly mediated by the perceived competence of the system. This result provides empirical evidence for the relation between the LoA of a system, the user's perceived competence of the system, and the perceived alliance with it. Additionally, we provide evidence for a proof-of-concept that the chosen preference learning method (i.e., Double Thompson Sampling (DTS)) is suitable for online HRI

Cognitive, social and emotional development

No abstract available