6,055 research outputs found
Modelling Wt and tWZ production at NLO for ATLAS analyses
The generation of single top production in the channel at NLO gives rise
to doubly-resonant diagrams that overlap with , and similarly for
associated production with a or Higgs boson. Several methods exist to
remove this overlap, thus avoiding double counting and separating the two
processes. In Diagram Removal 1, the amplitudes of doubly-resonant diagrams are
set to zero, which also removes the interference of with . If a
measurement is performed in a region where this interference is not negligible,
it would be of interest to take it into account. Another method, Diagram
Subtraction, preserves the interference. However, it relies upon momentum
reshuffling, which introduces uncertainties to the prediction. An alternative
method, Diagram Removal 2, does not involve reshuffling and preserves the
interference by subtracting the amplitude squared of the doubly-resonant
diagrams from the total. The predictions of Diagram Removal 2 from MG5_aMC@NLO
are compared with other predictions for and production in the
context of analyses at the ATLAS experiment. Implications of using Diagram
Removal 2 are discussed, both for measurements of single top processes and when
or are treated as a background. Differential distributions are
shown, investigating in what regions the predictions differ the most.Comment: Conference: The 9th International Workshop of Top Quark Physics 2016
5 pages including title page, 7 figure
Seamless mobility with personal servers
We describe the concept and the taxonomy of personal servers, and their implications in seamless mobility. Personal servers could offer electronic services independently of network availability or quality, provide a greater flexibility in the choice of user access device, and support the key concept of continuous user experience. We describe the organization of mobile and remote personal servers, define three relevant communication modes, and discuss means for users to exploit seamless services on the personal server
The Ubiquitous Interactor - Device Independent Access to Mobile Services
The Ubiquitous Interactor (UBI) addresses the problems of design and
development that arise around services that need to be accessed from many
different devices. In UBI, the same service can present itself with different
user interfaces on different devices. This is done by separating interaction
between users and services from presentation. The interaction is kept the same
for all devices, and different presentation information is provided for
different devices. This way, tailored user interfaces for many different
devices can be created without multiplying development and maintenance work. In
this paper we describe the system design of UBI, the system implementation, and
two services implemented for the system: a calendar service and a stockbroker
service
Carter's constant revealed
A new formulation of Carter's constant for geodesic motion in Kerr black
holes is given. It is shown that Carter's constant corresponds to the total
angular momentum plus a precisely defined part which is quadratic in the linear
momenta. The characterization is exact in the weak field limit obtained by
letting the gravitational constant go to zero. It is suggested that the new
form can be useful in current studies of the dynamics of extreme mass ratio
inspiral (EMRI) systems emitting gravitational radiation.Comment: Minor changes to match published versio
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Acute Jaundice in a Six-year-old: An Unusual Presentation of Atypical Kawasaki Disease
Kawasaki disease (KD) is a rare vasculitis of childhood that is critical to recognize and treat due to associated morbidity and mortality. A six-year-old male presented to our emergency department (ED) afebrile but with reported recent fevers. Exam revealed jaundice and erythematous tongue with papules, and laboratory studies indicated a direct hyperbilirubinemia. Admitted for evaluation, he developed continuous fever, increasing maculopapular rash, and subsequent desquamation of hands and feet. He ultimately met criteria for incomplete KD, was treated with intravenous immunoglobulin, and avoided cardiac complications. This presentation of incomplete KD with hyperbilirubinemia is rare because the patient was afebrile at ED presentation
PRIMA — Privacy research through the perspective of a multidisciplinary mash up
Based on a summary description of privacy protection research within three fields of inquiry, viz. social sciences, legal science, and computer and systems sciences, we discuss multidisciplinary approaches with regard to the difficulties and the risks that they entail as well as their possible advantages. The latter include the identification of relevant perspectives of privacy, increased expressiveness in the formulation of research goals, opportunities for improved research methods, and a boost in the utility of invested research efforts
Unblocking a Free Market Perspective in Labor Economics
Includes bibliographical references.In Labor Economics from a Free Market Perspective: Employing the Unemployable (2008) Walter Block presents a seemingly comprehensive free market perspective on the economics of the labor market.In this paper, I analyze the essence of Block's argument from what I suspect is a somewhat unexpected angle: I criticize the scope of his arguments, and especially his conclusions and underlying assumptions and reasons, adopting the radically libertarian or free-market point of view - the very same view championed and utilized by Block
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