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146 Research products, page 1 of 15

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  • English
    Authors: 
    Rob Strachan; Peter A. Cawood; Peter D. Kinny; Emilie Bruand;
    Publisher: HAL CCSD
    Country: France

    International audience

  • Closed Access English
    Authors: 
    E. Grauges; A. Comerma; Lluis Garrido; David Gascon; Jordi Garra; Ricardo Graciani; Eduard Picatoste; E. Aguilo; Xavier Vilasis-Cardona; Álvaro Gaspar de Valenzuela; +11 more
    Publisher: HAL CCSD
    Country: France

    International audience; The final choice as the photomultiplier solution for both the LHCb Pre-Shower (PS) and the Scintillator Pad Detector (SPD) are the R7600-00-M64MOD Hamamatsu 64 channel photomultiplier tubes (MaPMT). A total of 220 units have been purchased to the manufacturer and around 100 units, the part corresponding to the SPD, have been characterized at the photon detection test bench facility in the University of Barcelona (UB) high energy physics group laboratory. There, the crucial features of the tubes such as linearity, gain, channel cross-talk and anode uniformity of response have been measured to ensure the compliance with the specifications agreed with the manufacturer.

  • Publication . Conference object . Article . Other literature type . Preprint . 2007
    Open Access English
    Authors: 
    Frankfurt, L.; Hyde, C. E.; Strikman, M.; Weiss, C.;
    Publisher: HAL CCSD
    Countries: Germany, France

    We summarize how the approach to the black--disk regime (BDR) of strong interactions at TeV energies influences rapidity gap survival in exclusive hard diffraction pp--> p + H + p (H =dijet, \bar Q Q, Higgs). Employing a recently developed partonic description of such processes, we discuss (a) the suppression of diffraction at small impact parameters by soft spectator interactions in the BDR; (b) further suppression by inelastic interactions of hard spectator partons in the BDR; (c) effects of correlations between hard and soft interactions, as suggested by various models of proton structure (color fluctuations, spatial correlations of partons). Hard spectator interactions in the BDR substantially reduce the rapidity gap survival probability at LHC energies compared to previously reported estimates. 9 pages, 4 figures, To appear in the proceedings of 12th International Conference on Elastic and Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany, 21-25 May 2007

  • Publication . Preprint . Conference object . 2006
    Open Access English
    Authors: 
    Aubert, B.; Barate, R.; Bona, M.; Boutigny, D.; Couderc, F.; Karyotakis, y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; +190 more
    Country: France
    Project: NSERC

    We present measurements of time-dependent CP-violation asymmetries for the decays B0 to eta'K0. The data sample corresponds to 347 million BBbar pairs produced by e+e- annihilation at the Upsilon(4S) resonance in the PEP-II collider, and collected with the BaBar detector. The preliminary results are S = 0.55+/-0.11+/-0.002, and C = -0.15+/-0.07+/-0.03, where the first error quoted is statistical, the second systematic. Comment: 15 pages, 4 postscript figues, submitted to ICHEP2006

  • Publication . Conference object . Part of book or chapter of book . 2017
    Open Access English
    Authors: 
    Y. Xing; M. Abaline; S. Acounis; N. Beaupère; J.L. Beney; Julien Bert; S. Bouvier; P. Briend; J. Butterworth; Thomas Carlier; +25 more
    Publisher: HAL CCSD
    Country: France

    International audience; An innovative liquid xenon Compton camera project, XEMIS (XEnon Medical Imaging System) has been proposed by SUBATECH laboratory, for a new functional medical 3γ imaging technique based on the detection in coincidence of 3 γ-rays. The purpose of this 3γ imaging modality is to obtain a 3D image using 100 times less activity than in current PET systems. The combination of a liquid xenon time projection chamber (LXe TPC) and a specific (β$^{+}$, γ) radionuclide emitter$^{44}$Sc is investigated in this concept. In order to provide an experimental demonstration for the use of a LXe Compton camera for 3γ imaging, a succession of R&D programs, XEMIS1 and XEMIS2, have been carried out using innovative technologies. The first prototype XEMIS1 has been successfully validated showing very promising results for energy, spatial and angular resolutions with an ultra-low noise front-end electronics. The second phase dedicated to a 3D imaging of small animals, XEMIS2, is now under installation and qualification, while the characterizations of ionization signal using Monte Carlo simulation has shown preliminary good performances for energy measurement.

  • Open Access English
    Authors: 
    Laure Kuhfuss; Julie Subervie;
    Publisher: HAL CCSD
    Countries: United Kingdom, France, United Kingdom

    Funding for this research was provided by the French Agency for Water and Aquatic Environments (1073/2012) (ONEMA) as part of the 2011 call for projects ‘Changer les pratiques agricoles pour preserver les services ecosystemiques' supporting the implementation of the French National Action plan Ecophyto 2018. This paper was partly funded by the Rural & Environment Science & Analytical Services Division of the Scottish Government. Agri-environmental schemes (AES) are a central component of the European environmental policy, but few of these schemes have been carefully evaluated and doubts are often expressed about their effectiveness. We use original data collected from winegrowers who participated in an AES targeting non-point source pollution from herbicides in 2011 and 2012 in the South region of France. Using the variation in the implementation of the scheme across time and space and a matching approach, we show that the quantity of herbicides used by participants in the scheme in 2011 ranges from 38 to 53% below what they would have used without the scheme and this percentage is between 42 and 50% in 2012. Further, our results suggest that least demanding AES options are effective in avoiding pollution peaks when weed pressure is high, whereas more demanding AES options guarantee an overall reduction in herbicide use, even during relatively easy farming years in which less weed pressure is experienced. Postprint Peer reviewed

  • Publication . Preprint . Conference object . Article . 2017
    Open Access English
    Authors: 
    Ke Fang; Jaime Alvarez-Muniz; Rafael Alves Batista; Mauricio Bustamante; Washington Carvalho; Didier Charrier; Ismaël Cognard; Sijbrand de Jong; Krijn D. de Vries; Chad Finley; +33 more
    Publisher: HAL CCSD
    Country: France

    The Giant Radio Array for Neutrino Detection (GRAND) aims at detecting ultra-high energy extraterrestrial neutrinos via the extensive air showers induced by the decay of tau leptons created in the interaction of neutrinos under the Earth's surface. Consisting of an array of $\sim10^5$ radio antennas deployed over $\sim 2\times10^5\,\rm {km}^2$, GRAND plans to reach, for the first time, an all-flavor sensitivity of $\sim1.5\times10^{-10} \,\rm GeV\, cm^{-2} \,s^{-1}\, sr^{-1}$ above $5\times10^{17}$ eV and a sub-degree angular resolution, beyond the reach of other planned detectors. We describe here preliminary designs and simulation results, plans for the ongoing, staged approach to the construction of GRAND, and the rich research program made possible by GRAND's design sensitivity and angular resolution. Comment: Proceedings of the 35th International Cosmic Ray Conference (ICRC2017), Bexco, Busan, Korea

  • English
    Authors: 
    Guy, Bernard;
    Publisher: HAL CCSD
    Country: France

    4 pages; Time does not exist: there is no mysterious substance that would flow everywhere but that one would never see. Time does not flow. Time does not exist alone, time is relation. But space that matters is also relation. It is thus necessary to think time as a non separable way to think space, as relativity theory already implicitly invites us to say. Some consequences of this approach are outlined on a general standpoint and on the point of view of the equations. The difficulty in seizing this point of view puts the mind in front of an epistemological circle, the (provisional) stop of which requires a renouncement of thought: thought is not founded on itself; we cannot avoid sometime to show something of the reality external to thought, and to allot to it some qualities that we are not “sure” of (cf. the postulate of the constancy of light speed). One retrieves the concepts of uncompleteness, uncertainty, undecidable propositions, withdrawal of foundations etc. which are a general characteristic of the contemporary scientific and philosophical thought. Pascal already said in his “Pensées”: “whatever the end at which we were aiming in order to stop and rest, it escapes, slips from our grasp and flees for an eternal run ". But does one think time better today?

  • Publication . Part of book or chapter of book . Conference object . 2020
    Closed Access
    Authors: 
    Khaled Medini; Antoine Pierné; John Ahmet Erkoyuncu; Christian Cornet;
    Publisher: Springer International Publishing
    Country: France

    International audience; Production ramp-up is a critical step in product life cycle as it could lead to either success or failure of product introduction into the market. The criticality of this step is owed to several factors including the uncertainty underlying this step regarding both expected costs and benefits, and thus to the complexity of decision-making. In order to enlighten decision makers particularly in multi-variant production contexts, this paper elaborates on an analytical model supporting cost-benefit analysis of production ramp-up strategies. The model takes into account capacity planning decisions and learning curves in determining cost-benefit estimates. The model is illustrated and discussed through a keyrings manufacturing process.

  • Publication . Article . Conference object . Preprint . Other literature type . 2012
    Open Access English
    Authors: 
    Basso, Lorenzo; Anna Lipniacka; Mahmoudi, Farvah; Moretti, Stefano; Osland, Per; Pruna, Giovanni Marco; Purmohammadi, Mahdi;
    Country: France
    Project: EC | PSI-FELLOW (290605)

    We review and update the interpretation of the 125 GeV scalar as the lightest Higgs boson of the Two-Higgs-Doublet Model, allowing for CP violation in the potential. The detection of a charged Higgs boson would exclude the Standard Model. Proposed benchmarks for charged-Higgs searches in the channel pp\to H^+W^-X\to W^+W^-H_1X are reviewed and updated. 14 pages

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