492 research outputs found
The NA60 experiment readout architecture
No full textThe NA60 experiment was designed to identify signatures of a new state of matter, the Quark Gluon Plasma, in heavy-ion collisions at the CERN Super Proton Synchroton. The apparatus is composed of four main detectors: a muon spectrometer (MS), a zero degree calorimeter (ZDC), a silicon vertex telescope (VT), and a silicon microstrip beam tracker (BT). The readout of the whole experiment is based on a PCI architecture. The basic unit is a general purpose PCI card, interfaced to the different subdetectors via custom mezzanine cards. This allowed us to successfully implement several completely different readout protocols (from the VME like protocol of the MS to the custom protocol of the pixel telescope). The system was fully tested with proton and ion beams, and several million events were collected in 2002 and 2003. This paper presents the readout architecture of NA60, with particular emphasis on the PCI layer common to all the subdetectors.
RI Tinoco Mendes, Andre David/D-4314-201
Phi production in p-A and In-In collisions
No full textThe NA60 experiment studied Phi meson production in p-A and In-In collisions at the CERN SPS. The ratio Phi / Omega shows an increase by a factor ?2 from peripheral to central collisions. The inverse slope parameter T of the p T spectrum increases with centrality, and seems to agree with the previous NA49 measurements. ? 2006
Débuts de demoiselle Emma Jutau et de la troupe Rosinsky : Cirque d’Été, Champs-Élysées &ndash Carré Marigny
No full textLithographie, typographie, noir et blanc. Impression en noir sur papier couleur, collée sur placard typographique, 84 x 60 cmLe Cirque d’Été présente pour la première fois en France Mlle Emma Jutau, ou Juteau, acrobate et gymnaste, c’est-à-dire, selon le mot de la fin du XIX e siècle, gymnasiarque. Selon William L. Slout, l’artiste aurait effectué trois saisons en tant que gymnaste et trapéziste chez Warner Henderson & Co en 1874, Springer’s Royal Cirq-Zoolodon en 1875 puis, en tant que trapéziste dans le grand cirque Cooper, Bailey & Co., rival de celui de PT Barnum’s, en 1876, avant de traverser l’Atlantique. Sa tournée européenne commence l’année suivante en Angleterre, au Howes’ Great London Circus. Après une série de prestations en France, selon Alwill Raeder, elle effectue un mois d’engagement dans le prestigieux établissement d’Ernst Renz à Berlin, du 15 décembre 1880 au 14 janvier 1881. Infatigable, elle met ensuite le cap sur l’Amérique du Sud, par le Mexique, au cirque des frères Orrin pendant l’hiver 1882 et au cirque des Dockrill’s, Richard et Elise Kennebel, jusqu’en 1886. À la fois forte, souple et gracieuse, elle est souvent comparée à Leona Dare , une acrobate de force américaine née en 1855, dont on vante « la mâchoire d’acier » qui lui permet de se suspendre à la barre d’un trapèze, notamment sous un ballon dirigé par l’aéronaute et photographe Edouard Spelterini. Tout comme Emma Jutau attrape entre ses dents la petite barre d’un dispositif qui lui permet de glisser le long d’un câble oblique tendu dans la salle du cirque. À l’été 1879, la presse répercute la nouvelle de son accident au Cirque d’Été et annonce son retour. À l’Hippodrome de l’Alma puis aux Folies Bergère, où elle est engagée par la suite, elle présente un répertoire d’exercices plus élaborés aux anneaux et au trapèze, prouesse peu courante pour des acrobates féminines. Fait plus rare encore, elle exécute des grimpers et d’autres figures le long d’une corde lisse qui, fixée au sol, s’apparente au mât chinois adopté au XX e siècle. Apparu avec les troupes japonaises découvertes par les Occidentaux au milieu des années 1860, l’agrès est baptisé corde japonaise, ainsi que le mentionne Georges Strehly dans L’Acrobatie et les acrobates . Elle est pratiquée à la verticale comme le montre une image de l’Anglaise Miss Jeanette Dorina vers 1890, ou oblique à la façon de Little AllRight – Hamaikari Umekichi – ou de Mlle Louise Triaud, du Cirque Alphonse Rancy. En 1904, cette dernière incarne le « fantôme aérien de La Boucle » en escaladant un câble de 12 mètres, le corps enduit d’une matière fluorescente, dans le Luna Park de la rue de Clichy. Sources : - William L. Slout, Olympians of the Sawdust Circle: A Biographical Dictionary of the Nineteenth Century American Circus , Borgo Press, 1998, p. 151. - Alwill Raeder, Der Circus Renz in Berlin 1846-1896 , Berlin, 1897, p. 165-166. - Description du numéro et d’un accident d’Emma Jutau au Cirque d’Été, par Argus, dans La Semaine des Familles du 23 août 1879, p. 335-336. - Rentrée de l’équilibriste Mlle Juteau au Cirque d’Été, bien remise de l’accident dont elle a été victime dans La Liberté du 5 septembre 1879. - Débuts aux Folies Bergère de la jeune et charmante gymnaste déjà célèbre, émule de Leona Dare, Emma Jutau, dans Le Tintamarre du 1 er avril 1880. - La Culture Physique du 1 er mai 1914, p. 11. - La troupe Rosinsky, équilibristes et sauteurs sur pyramide de tables au Cirque d’Été dans Le Gaulois du 20 août 1879. - Le Figaro du 13 octobre 1904, 5 e colonne. - Cirque Alphonse Rancy à Lyon : début de Mlle Triaud à la corde japonaise dans La Tribune de Genève du 16 mai 1903.téléchargeabl
The Covid Crisis and CEO Pay Balance
No full textThis paper focuses on the socio-economic challenges created by the Covid crisis. More specifically, it examines the impact of the COVID crisis on CEO Pay balance in Nasdaq. The research focuses on the top 10 most valuable firms traded on the NASDAQ. The 2017-2019 period is taken as the pre-Covid period, the 2020-2022 period is taken as the post-Covid period, and the CEO Pay balance is compared across these two periods. For the CEO Pay balance, four variables are used. These are the Pay ratio (which compares the CEO's pay to the average employee’s pay), the CEO/President ratio, the CEO/Top Vice President ratio, and the CEO/Average Vice President ratio. First, the trends in each CEO pay balance variable over the sample period are examined. During the 2017-2022 period, the CEO Pay ratio more than doubled (i.e. a 150% increase), while the CEO/President ratio doubled (i.e. a 100% increase). These findings show that, during this period, the average employee and the President suffered relative to the CEO regarding their pay. When the CEO/Top VP and the CEO/Average VP are examined, the results show little or no difference. Therefore, VPs did well during this period. Non-parametric tests are then performed to compare the pre-Covid and post-Covid periods. The results show that the increase in the CEO pay ratio (i.e. compared to the average worker) was statistically significant. At the same time, the change in the other three variables were insignificant. Finally, regressions are run to see whether there was a significant change in each pay balance variable after COVID-19. After controlling for firm size, growth, leverage, and profitability, there is no significant difference in the CEO pay balance measures pre- versus post-COVID
A new ultra radiation hard cryogenic silicon tracker for heavy ion beams
No full textWe have designed and built a new hodoscope for heavy ion beams consisting of two tracking stations equipped with silicon microstrip detectors operated at 130 K. Preliminary results from tests performed in the high intensity CERN-SPS Pb ion beam show that we were able to detect and identify each incoming ion up to a beam intensity of similar to 10(7) ions/s. The beam profile could be monitored on-line with 50 mum resolution. The detector performed satisfactory even after a dose of 90 +/- 40 Grad
Nuclear dependence of light neutral meson production in p-A collisions at 400 GeV with NA60
No full textInternational audienceThe NA60 experiment has studied low-mass muon pair production in proton–nucleus collisions with a system of Be, Cu, In, W, Pb and U targets, using a 400 GeV proton beam at the CERN SPS. The transverse momentum spectra of the and mesons are measured in the full range accessible, from up to . The nuclear dependence of the production cross sections of the , and mesons has been found to be consistent with the power law , with the parameter increasing as a function of for all the particles, and an approximate hierarchy . The cross section ratios , and have been studied as a function of the size A of the production target, and an increase of the and yields relative to the is observed from p–Be to p–U collisions
Phi meson production in NA60
No full textNA60 is a fixed-target experiment at the CERN SPS which measured dimuon production in nucleus-nucleus and proton-nucleus collisions. The experiment collected muon pair samples of unprecedented quality in heavy-ion experiments. This paper presents a high quality measurement of the p(T) distribution of the phi meson, covering a broad p(T) window. The data were collected in 2003 in In-In collisions at 158 GeV per nucleon. The results, presented as a function of centrality, were studied against several possible sources of systematic effects and proved to be fairly stable. We show that the inverse m(T) slope measured in In-In collisions, in the phi -> mu mu decay channel, depends significantly on the range used to perform the fit. When the fit is performed at low transverse momentum, the effective inverse slope increases from peripheral to central collisions, as measured by other experiments. We finally show that our measurement for In-In is compatible with the overall systematics of T slope versus mass, measured in different collision systems by the NA49 experiment. RI Tinoco Mendes, Andre David/D-4314-2011; Cortese, Pietro/G-6754-201
Rapidity-rank structure of p anti-p pairs in hadronic Z0 decays
No full textThe rapidity-rank structure of pp̄ pairs is used to analyze the mechanism of baryon production in hadronic Z0 decay. The relative occurrence of the rapidity-ordered configuration p M p̄, where M is a meson, and that of pp̄ adjacent pairs is compared. The data are found to be consistent with predictions from a mechanism producing adjacent-rank pp̄ pairs, without requiring 'string-ordered' p M p̄ configurations. An upper limit of 15% at 90% confidence is determined for the p M p̄ contribution. (C) 2000 Elsevier Science B.V.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Feasibility study of a XML-based software environment to manage data acquisition hardware devices
No full textCorrelation coefficients and corresponding p-values.
No full textCorrelation coefficients and corresponding p-values.</p
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