Patrícia Dias

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We describe a user study comparing a low cost VR system using a Head-Mounted-Display (HMD) to a desktop and another setup where the image is projected on a screen. Eighteen participants played the same game in the three platforms. Results show that users generally did not like the setup using a screen and the best performances were obtained with the desktop(More)
Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one(More)
A measurement of the inclusive semileptonic branching ratios of b hadrons produced in Z decay is presented, using four million hadronic events collected by the ALEPH detector from 1991 to 1995. Electrons and muons are selected opposite to b-tagged hemispheres. Two different methods are explored to distinguish the contributions from direct b → Xlν and(More)
Quark and gluon jets with equal energies are identified in three-jet hadronic Z ~ events, using reconstructed secondary vertices from heavy quark decay in conjunction with energy ordering of the jets to anti-tag the gluon jets. Selection of jets from a symmetric event topology allows their properties to be compared in a simple and direct manner. The jets(More)
Data collected at centre-of-mass energies of 181–184 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 56.9 pb, are analysed in a search for pair-produced charged Higgs bosons H. Three analyses are employed to select the τνττ ν̄τ , cs̄τ ν̄τ/c̄sτ ντ and cs̄sc̄ final states. No evidence for a signal is found. Mass limits are set as a function(More)
This paper describes an analysis of sub-jet multiplicities, which are expected to be sensitive to the properties of soft gluon radiation, in hadronic decays of the Z ~ Twoand three-jet event samples are selected using the k• jet clustering algorithm at a jet resolution scale Yl. The mean sub-jet multiplicity as a function of the sub-jet resolution, Yo, is(More)
This study investigated whether language control during language production in bilinguals generalizes across modalities, and to what extent the language control system is shaped by competition for the same articulators. Using a cued language-switching paradigm, we investigated whether switch costs are observed when hearing signers switch between a spoken(More)
The fraction of b bevents in hadronic Z o decays has been measured from the yield of leptons in the data samples collected by OPAL in 1990 and 1991. A sample enriched in events containing Z~ decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After(More)