Bulletin of the American Physical Society
2006 8th Annual APS Northwest Section Meeting
Friday–Saturday, May 19–20, 2006; Tacoma, Washington
Session G5: Particle Physics |
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Chair: Eric Torrence, University of Oregon and Paul Weber, University of Puget Sound Room: Jones 203 |
Saturday, May 20, 2006 2:00PM - 2:36PM |
G5.00001: The International Linear Collider Invited Speaker: The proposed electron-positron International Linear Collider is aimed at exploration of the new physics of the Terascale. A global effort is underway to design and plan the collider, and the detectors. With a unique capability for precision measurements, the ILC will advance discoveries of the LHC, and enable discoveries beyond. The physics goals and the latest progress world-wide will be reviewed. [Preview Abstract] |
Saturday, May 20, 2006 2:36PM - 3:12PM |
G5.00002: Status of the Atlas at the LHC Invited Speaker: |
Saturday, May 20, 2006 3:12PM - 3:32PM |
G5.00003: BREAK
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Saturday, May 20, 2006 3:32PM - 3:52PM |
G5.00004: An Introduction to the LHC Olympics Andrew Larkoski, Kyle Armour, Amanda Gray, Dan Ventura, Jon Walsh, Rob Schabinger The LHC Olympics is a series of workshop aimed at encouraging theorists and experimentalists to prepare for the soon-to-be-online Large Hadron Collider in Geneva, Switzerland. One aspect of the LHC Olympics program consists of the study of simulated data sets which represent various possible new physics signals as they would be seen in LHC detectors. Through this exercise, LHC Olympians learn the phenomenology of possible new physics models and gain experience in analyzing LHC data. Additionally, the LHC Olympics encourages discussion between theorists and experimentalists, and through this collaboration new techniques could be developed. The University of Washington LHC Olympics group consists of several first-year graduate and senior undergraduate students, in both theoretical and experimental particle physics. Presented here is an introduction to how such an LHC Olympics study is done. Various basic analysis tools and techniques are discussed. [Preview Abstract] |
Saturday, May 20, 2006 3:52PM - 4:12PM |
G5.00005: LHC Olympics: Advanced Analysis Techniques Kyle Armour, Andrew Larkoski, Amanda Gray, Dan Ventura, Jon Walsh, Rob Schabinger The LHC Olympics is a series of workshop aimed at encouraging theorists and experimentalists to prepare for the soon-to-be-online Large Hadron Collider in Geneva, Switzerland. One aspect of the LHC Olympics program consists of the study of simulated data sets which represent various possible new physics signals as they would be seen in LHC detectors. Through this exercise, LHC Olympians learn the phenomenology of possible new physics models and gain experience in analyzing LHC data. Additionally, the LHC Olympics encourages discussion between theorists and experimentalists, and through this collaboration new techniques could be developed. The University of Washington LHC Olympics group consists of several first-year graduate and senior undergraduate students, in both theoretical and experimental particle physics. Presented here is a discussion of some of the more advanced techniques used and the recent results of one such LHC Olympics study. [Preview Abstract] |
Saturday, May 20, 2006 4:12PM - 4:32PM |
G5.00006: Discovering a Hidden Valley; Unusual Signals at Hadron Colliders Matthew Strassler, Kathryn Zurek We consider models in which a new confining gauge group is added to the standard model of particle physics. Many new neutral particles with low masses, long lifetimes, and observable decays at hadron colliders (the Tevatron and the LHC) often arise in these models, giving exotic signals. Production multiplicities of the new particles are often large; final states with heavy flavor quarks are common; displaced vertices and/or missing energy are possible. For illustration we consider the physics of a specific model. After accounting for LEP constraints, we find production cross-sections at the LHC are typically in the 1-100 fb range, though they can be much larger, in which case they may be observable at the Tevatron. We note that there is a possibility of discovering the Higgs boson through its rare decays to the new particles. [Preview Abstract] |
Saturday, May 20, 2006 4:32PM - 4:52PM |
G5.00007: The Evergreen State College Cyclotron Project Paul Lessard, Amandeep Dhillon, Christopher Smalls We have designed a multipurpose cyclotron device, which may be used in a range of experiments. We are building our device in stages. Our first stage is a FT-ICR spectrometer, which uses an array of induction coils to monitor orbits in the chamber. Applying Fourier transform to the signal from this array will yield the cyclotron frequencies of all species orbiting in the chamber. From these frequencies, and their corresponding amplitudes, we can determine the charge to mass ratio, and relative abundance of species in our sample. This type of spectroscopy can distinguish between species of extremely similar mass. We will use the radio isotopic dating ladder, which requires higher and higher accuracies, beginning with carbon 14 dating, as a yardstick of our Success. During stage two we will install an exit port for an accelerated particle beam. We have designed a new beam extraction method that may better suit our particular application than the standard methods. At this stage we will use the signal coming from the induction array to determine the frequency at which we switch the potential across the gap. This allows us to synchronize the accelerating voltage and the particles orbit in such a way that we can effectively accelerate particles even when moving at relativistic speeds. [Preview Abstract] |
Saturday, May 20, 2006 4:52PM - 5:12PM |
G5.00008: Asymmetry in Muon Psuedo-Rapidity and the Search for Single Top Quarks at the Tevatron Amanda Gray, Thomas Gadfort, Gordon Watts Single top quark production is an infrequent electroweak process whose study can verify and potentially extend the Standard Model. Extracting the single-top signal from the W-boson-plus-jets background requires a better understanding of both signal and background. In proton anti-proton collisions, lepton decay products tend to move in a direction along the beamline correlated with their charge, causing an asymmetry in the lepton pseudo-rapidity. The asymmetry can give insight to the nucleon parton densities which affect typical background and signal events. We analyzed the asymmetry in pseudo-rapidity of muons produced by W-boson decay in Monte Carlo simulations of signal and background events, and in 320 pb-1 data recorded by the D0 RunII experiment. Bin-by-bin counting, skewness, and kurtosis calculations showed that the predicted asymmetry is present in the Monte Carlos and data, and different for the processes considered. However, the statistical errors are significant. This analysis is expected to be useful at the end of RunII, when datasets of 4 fb-1 are collected. [Preview Abstract] |
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