213,835 research outputs found

    Extended Gauge Models and e−e−→W−W−e^-e^- \to W^-W^- at the NLC

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    We briefly discuss two possible manifestations of the lepton number violating reaction e−e−→Wi−Wj(∗)−e^-e^- \to W_i^-W_j^{(*)-}, which probes the masses and mixings of heavy Majorana neutrinos, at the Next Linear Collider(NLC). Cross sections for this process are shown to be potentially quite large at center of mass energies of order 1-1.5 TeV. (Talk presented at the Santa Cruz Workshop on e−e−e^-e^- Physics at the NLC, University of California, Santa Cruz, September 4-5, 1995.)Comment: 9 pages, uuencoded compressed postscript file. To obtain a copy of this paper send e-mail to [email protected]

    SUSY Without Prejudice at Linear Colliders

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    We explore the physics of the general CP-conserving MSSM with Minimal Flavor Violation, the pMSSM. The 19 soft SUSY breaking parameters are chosen so to satisfy all existing experimental and theoretical constraints assuming that the WIMP is the lightest neutralino. We scan this parameter space twice using both flat and log priors and compare the results which yield similar conclusions. Constraints from both LEP and the Tevatron play an important role in obtaining our final model samples. Implications for future TeV-scale e+e−e^+e^- linear colliders(LC) are discussed.Comment: 6 pages, 3 figs. Talk given at LCWS08, Chicago, IL, USA, 11/16-20/200

    Upgrade of the ATLAS Liquid Argon Calorimeters for the High-Luminosity LHC

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    The increased particle flux at the high luminosity phase of the Large Hadron Collider (HL-LHC), with instantaneous luminosities of up to 7.5 times the original design value, will have an impact on many sub-systems of the ATLAS detector. This contribution highlights the particular impacts on the ATLAS liquid argon calorimeter system, together with an overview of the various upgrade plans leading up to the HL-LHC. The higher luminosities are of particular importance for the forward calorimeters (FCal), where the expected increase in the ionization load poses a number of problems that can degrade the FCal performance such as beam heating and space-charge effects in the liquid argon gaps and high-voltage drop due to increased current drawn over the current-limiting resistors. A proposed FCal replacement as a way to counter some of these problems is weighed against the risks associated with the replacement. To further mitigate the effects of increased pile-up, the installation of a high-granularity timing detector at the front face of each end-cap cryostat is also currently under consideration. Several different sensor technologies and layouts are being investigated.Comment: 7 pages, 12 figures, Proceedings of the IEEE Nuclear Science Symposium (NSS), Strasbourg, France, October 29 - November 5, 201

    Understanding the Internet: Model, Metaphor, and Analogy

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