1,232 research outputs found
Jet Structure Studies in Small Systems
A study investigating a possible jet shape dependence on the charged event
multiplicity was performed on collision samples generated by Monte-Carlo (MC)
event generators PYTHIA and HIJING++. We calculated the integral jet shape and
found a significant modification caused by multiple-parton interactions. By
interchanging and enabling different model ingredients in the simulations and
analyzing the results in several bins and event multiplicity classes, we
found a characteristic jet size measure that was independent of the chosen
tunes, settings, and jet reconstruction algorithms
U_A(1) Symmetry Restoration from an In-Medium eta' Mass Reduction in sqrt(s(NN)) = 200 GeV Au+Au Collisions
A reduction of the mass of the eta'(958) meson may signal restoration of the
U_A(1) symmetry in a hot and dense hadronic matter, corresponding to the return
of the 9th, "prodigal" Goldstone boson. We report on an analysis of a combined
PHENIX and STAR data set on the intercept parameter of the two-pion
Bose-Einstein correlation functions, as measuremed in sqrt(s(NN)) = 200 GeV Au
+ Au collisions at RHIC. To describe this combined PHENIX and STAR dataset, an
in-medium eta' mass reduction of at least 200 MeV is needed, at the 99.9 %
confidence level in a broad model class of resonance abundances.Comment: 12 pages, 5 figures, to appear in the Proceedings of the Gribov'80
Memorial Worksho
A Cosmic Ray Measurement Facility for ATLAS Muon Chambers
Monitored Drift Tube (MDT) chambers will constitute the large majority of
precision detectors in the Muon Spectrometer of the ATLAS experiment at the
Large Hadron Collider at CERN. For commissioning and calibration of MDT
chambers, a Cosmic Ray Measurement Facility is in operation at Munich
University. The objectives of this facility are to test the chambers and
on-chamber electronics, to map the positions of the anode wires within the
chambers with the precision needed for standalone muon momentum measurement in
ATLAS, and to gain experience in the operation of the chambers and on-line
calibration procedures.
Until the start of muon chamber installation in ATLAS, 88 chambers built at
the Max Planck Institute for Physics in Munich have to be commissioned and
calibrated. With a data taking period of one day individual wire positions can
be measured with an accuracy of 8.3 micrometers in the chamber plane and 27
micrometers in the direction perpendicular to that plane.Comment: 14+1 pages, 11 figures, contributed paper to the EPS2003 conference,
Aache
How People Judge the Usability of a Desktop Graphic User Interface at Different Time Points: Is there Evidence for Memory Decay, Recall Bias or Temporal Bias?
The System Usability Scale (SuS) survey is a widely respected tool for measuring usability. Generally, a SuS score is administered directly after a usability test to assess the usability and user experience of digital products. However, some researchers have used SuS as a survey as part of longitudinal ‘in the wild’ trials where SuS is often completed some period after the trial. The aim of this research was to determine if a participant’s memory of a product’s usability would change if a SuS survey was administered at different times after a test. Hence, we sought to understand if recalling the usability of a digital technology was affected by temporal bias or memory decay. This paper includes results and findings from two studies, study 1 involved evaluating a web application and study 2 involved evaluating a virtual learning environment. Collectively the two studies had 212 participants (n = 212). The findings conclude that there is no significant change of the user’s recollection of the usability of digital product as evidenced by an analysis of users who completed multiple SuS surveys over a short term period of 3 weeks or over an extended period of time of 6 months
Two Planets, One Species: Does a Mission to Mars Alter the Balance in Favour of Human Enhancement?
In this chapter we examine the implications of a crewed mission to Mars, possible colonisation of the planet, and the wider implications this may have on genetic enhancement in both a terrestrial and space context. We consider the usage of both somatic and germ-line genetic engineering, and its potential impact on the evolution of Homo sapiens. We acknowledge that a mission to Mars may require the usage of such technologies if it is to be successful. Our investigation suggests that the use of such technologies might ultimately be linked with the transformation of our own species. We also consider projected timescales for the development of these genetic enhancements and the ethical questions raised by the possibility of speciation. Cooperation among spacefaring nations in this context and the development of norms for the use of such technologies is desirable
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