Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session T13: LHC II |
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Sponsoring Units: DPF Chair: Michele Weber, Fermi National Accelerator Laboratory Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 |
Monday, April 16, 2007 1:30PM - 1:42PM |
T13.00001: Study of narrow high-mass particle production using di-lepton decay channels in ATLAS Taeksu Shin The CERN Large Hadron Collider (LHC) and the ATLAS experiment will begin to take data in 2007. A considerable effort has been made to study new physics signatures and backgrounds for beyond standard model (BSM) physics in ATLAS at the LHC. We present studies of di-lepton decay channels from exotic particle production, focused on the performance of the ATLAS detector for exotic particle production in early ATLAS data-taking scenarios. [Preview Abstract] |
Monday, April 16, 2007 1:42PM - 1:54PM |
T13.00002: Reconstruction and identification of hadronic tau-decays in ATLAS Adam Cunha The identification of tau-jet from the hadronic tau-decay is crucial for the study of many physics channels like the production of Higgs bosons decaying to taus or SUSY. The tau-jet reconstruction in ATLAS is performed starting from the energy deposed in calorimeters or also combining measure from calorimeter and tracking with energy-flow technique. Quantities built both from the calorimeters and from the inner detector are used to identify tau-jets against other jets. In the talk we will review the performance of tau-jet reconstruction and identification, showing that the excellent tau-efficiency vs the jet-rejection obtained in ATLAS will allow the study of channels where the background from jets is potentially very large. [Preview Abstract] |
Monday, April 16, 2007 1:54PM - 2:06PM |
T13.00003: Search for RPV SUSY through its Purely Hadronic Decay Modes Arie Melamed-Katz, Ehud Duchovni Two search procedures for signals of R-Parity Violating SUSY at ATLAS are discussed. The first one makes use of R-Parity Conserving production of a sparton pair followed by their RPV decay. The present procedure differs from previously proposed ones in two aspects: It does not require the presence of an identified lepton in the final state; and it makes use of b-tagging. The second channel is the resonating squark production through RPV coupling followed by its RPV decay into two quarks. Here also one can benefit from the use of b-tagging. The discovery potential of ATLAS in these two channels is evaluated. [Preview Abstract] |
Monday, April 16, 2007 2:06PM - 2:18PM |
T13.00004: A study of potential signals from the Hidden Valley in ATLAS Laura Bodine, Daniel Ventura In this talk we present results from a preliminary study of Hidden Valley particles decaying in the ATLAS detector at the Large Hadron Collider. The Hidden Valley Model\footnote{M. Strassler and K. Zurek hep-ph/0604261.} proposed by M. Strassler and K. Zurek predicts the existence of long-lived neutral particles that can decay to Standard Model particles. These particles may have long lifetimes, leading to unique signatures including highly displaced vertices. We present preliminary results of PYTHIA simulated Z' decays to Hidden Valley particles in the ATLAS detector. We discuss the typical event topology and the triggering efficiencies as a means of understanding the feasibility of detection in the ATLAS detector. [Preview Abstract] |
Monday, April 16, 2007 2:18PM - 2:30PM |
T13.00005: Monte Carlo Study of Leptoquark Production with ATLAS detector at the LHC Vikas Bansal Leptoquarks provide a mechanism for Grand Unification of fundamental forces at high energies and may soon be discovered at the Large Hadron Collider (LHC) at CERN. We studied the production of these hypothetical particles in proton-proton collisions at 14 TeV with the fully-simulated ATLAS detector. We present the analysis algorithm to search for leptoquarks in their most likely decay channels that could be accessible with the first-year LHC data. We outline our algorithms of measuring the trigger and reconstruction efficiencies in a fashion independent of Monte Carlo simulation. [Preview Abstract] |
Monday, April 16, 2007 2:30PM - 2:42PM |
T13.00006: Observation of a spinning top at the LHC Akira Shibata, Steve Lloyd, Graham Thompson, Lucio Cerrito The LHC and the ATLAS detector will enable us to carry out precision measurements of the top quark properties very shortly after the~ startup, and we will be searching for deviations from the standard model~ prediction at the energy scale close to electro-weak symmetry breaking. The single~ top production provides us with a unique opportunity to study the spin properties~of the top production bWt vertex, where maximal polarization is predicted by~ the SM through the V-A coupling. Due to its massiveness, the top decays~ before hadronization and its spin information is directly propagated to~ the decay products. Therefore, in this analysis, the top quark is~ reconstructed using a kinematic fit and the polarization is measured using a template~ method. Results using the Atlas full-simulation samples will be shown. The focus is on understanding the effect of background from W+jets events using the latest MC generators. [Preview Abstract] |
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