16924543
Reach of the CERN Large Hadron Collider for gauge-mediated supersymmetry breaking models
We examine signals for sparticle production at the CERN Large Hadron Collider (LHC) within the framework of gauge mediated supersymmetry breaking models with a low SUSY breaking scale for four different model lines, each of which leads to qualitatively different signatures. We first examine the reach of the LHC via the canonical ${E}_{T}$ and multilepton channels that have been advocated within the MSUGRA framework. Next, we examine special features of each of these model lines that could serve to further enhance the SUSY signal over standard model backgrounds. We use ISAJET to evaluate the SUSY reach of experiments at the LHC. We find that the SUSY reach, measured in terms of ${m}_{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}},$ is at least as large, and sometimes larger, than in the MSUGRA framework. In the best case of the co-NLSP scenario, the reach extends to ${m}_{\stackrel{\ifmmode \tilde{}\else \~{}\fi{}}{g}}g~3$ TeV, assuming 10 ${\mathrm{fb}}^{\ensuremath{-}1}$ of integrated luminosity.
16884548
The Reach of Tevatron upgrades in gauge mediated supersymmetry breaking models
We examine signals for sparticle production at the Fermilab Tevatron within the framework of gauge-mediated supersymmetry breaking models for four different model lines, each of which leads to qualitatively different signatures. We identify cuts to enhance the signal above standard model backgrounds, and use ISAJET to evaluate the supersymmetry reach of experiments at the Fermilab Main Injector and at the proposed TeV33. For the model lines that we have examined, we find that the reach is at least as large, and frequently larger, than in the minimal supergravity framework. For two of these model lines, we find that the ability to identify {ital b}-quarks and {tau}-leptons with high efficiency and purity is essential for the detection of the signal. {copyright} {ital 1999} {ital The American Physical Society}
17823222
LHC reach for gauge mediated supersymmetry breaking models via prompt photon channels
Abstract We evaluate the supersymmetry reach of the Large Hadron Collider within the gauge-mediated low energy supersymmetry breaking framework, assuming that a neutralino is the second lightest sparticle and that it decays promptly into a gravitino which escapes detection. We find that the maximum reach is obtained via a search for inclusive γγ+ E / T events coming dominantly from chargino and neutralino production. Assuming an integrated luminosity of 10 fb −1 , we find that LHC experiments will be able to probe values of the model parameter Λ ≲400 TeV, corresponding to m g ≤2.8 TeV. A measure of the model parameter Λ may be possible from the photon p T spectrum.
118581499
Holographic SIS Josephson junction
A bstractWe construct a holographic model for the superconductor-insulator-superconductor (SIS) Josephson junction at zero temperature by considering a complex scalar field coupled with a Maxwell field in the four-dimensional anti-de Sitter soliton background. From the gravity side we reproduce the sine relation between the Josephson current and the phase difference across the junction. We also study the dependence of the maximal current on the dimension of the condensate operator and on the width of the junction, and obtain expected results.
118863203
One-side forward-backward asymmetry in top quark pair production at the CERN Large Hadron Collider
Both D0 and CDF at Tevatron reported the measurements of forward-backward asymmetry in top pair production, which showed possible deviation from the standard model QCD prediction. In this paper, we explore how to examine the same higher-order QCD effects at the more powerful Large Hadron Collider.
31639934
New approach to background subtraction in low-energy neutrino experiments
We discuss a new method to extract neutrino signals in low-energy experiments. In this scheme the symmetric nature of most backgrounds allows for direct cancellation from data. The application of this technique to the Palo Verde reactor neutrino oscillation experiment allows us to reduce the measurement errors on the antineutrino flux from {approx}20% to {approx}10%. We expect this method to substantially improve the data quality in future low background experiments such as KamLAND and LENS. (c) 2000 The American Physical Society.
42445249
Hadron collider signatures for new interactions of top and bottom quarks
One of the main goals for hadron colliders is the study of the properties of the third generation quarks. We study the signatures for new TeV resonances that couple to top or bottom quarks both at the Tevatron Run II and at the CERN LHC. We find that in the simplest production processes of Drell-Yan type at the Tevatron, the signals are overwhelmed by QCD backgrounds. We also find that it is possible to study these resonances when they are produced in association with a pair of heavy quarks or in association with a single top at the LHC. In particular, with an integrated luminosity of 300 fb(-1) at the LHC, it is possible to probe resonance masses up to around 2 TeV.
14088655
The Mock LISA data challenges: from challenge 1B to challenge 3
The Mock LISA Data Challenges are a programme to demonstrate and encourage the development of LISA data-analysis capabilities, tools and techniques. At the time of this workshop, three rounds of challenges had been completed, and the next was about to start. In this paper we provide a critical analysis of the entries to the latest completed round, Challenge 1B. The entries confirm the consolidation of a range of data-analysis techniques for galactic and massive-black-hole binaries, and they include the first convincing examples of detection and parameter estimation of extreme-mass-ratio inspiral sources. In this paper we also introduce the next round, Challenge 3. Its data sets feature more realistic waveform models (e.g., galactic binaries may now chirp, and massive-black-hole binaries may precess due to spin interactions), as well as new source classes (bursts from cosmic strings, isotropic stochastic backgrounds) and more complicated nonsymmetric instrument noise.