Following the indexical line : Etienne-Jules Marey, Douglas Huebler, Sol LeWitt

The French physicist Etienne-Jules Marey (1830–1904) coined the term 'graphic method' for the array of recording devices that encoded phenomena in patterned lines such as seismographs, and chronophotography, also developed by Eadweard Muybridge (1830–1904). This research puts forward the indexical line as a new concept to locate and analyse how the line was informed by the technology of the ‘graphic method’ in experimental science of the nineteenth century and taken on by the conceptual art movement in the mid-1960s. It presents the redefinition of the line and its concomitant contexts such as drawing, technology, and abstract thinking, anachronistically. That is, dialogically across two time periods that re-assess each other through the scope of the index. Stemming from semiotics and applied to film and photography theory, the index as schematized by Charles S. Peirce (1839 – 1914) is a sign with a direct relation with the ‘real’ as cause between the sign and the thing: the object causes the shadow or the photograph, which are the indices. This notion was applied to the art of the 1970s (Krauss 1977; Doane 1996/2007; Iversen 2017) as a traumatic trace; here, Peirce’s notion is interpreted as a measurable trace to open it up to other potential readings, especially the conceptual project of an ego-less, unemotional array of data constituting the artwork. So, what happens if this type of line originating from technology is in direct relation with the reality it expresses graphically albeit abstractly, like a photograph? And what possibilities does it open up when it shifts to art? Through the case studies of the pioneers of conceptual art, Douglas Huebler and Sol LeWitt, who cross-referenced science, graphic and photographic endeavours across times, the indexical line provides a pathway from the graphic method to graphic expression, by introducing language, technology, maps, diagrams, and sequential photography into artistic practices. What is the consequence of such an introduction of science and technology in artistic formalisation of the artwork from the perspective of the subject (the artist-spectator)

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02

Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment

This paper describes an analysis of the angular distribution of W->enu and W->munu decays, using data from pp collisions at sqrt(s) = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb^-1. Using the decay lepton transverse momentum and the missing transverse energy, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f0, fL and fR over two ranges of W transverse momentum (ptw): 35 < ptw < 50 GeV and ptw > 50 GeV. Good agreement is found with theoretical predictions. For ptw > 50 GeV, the values of f0 and fL-fR, averaged over charge and lepton flavour, are measured to be : f0 = 0.127 +/- 0.030 +/- 0.108 and fL-fR = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.Comment: 19 pages plus author list (34 pages total), 9 figures, 11 tables, revised author list, matches European Journal of Physics C versio