Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session G1: Testing the Standard Model |
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Sponsoring Units: DPF Chair: Chris Quigg, Fermi National Accelerator Laboratory Room: Marriott Ballroom Salon 2 |
Sunday, February 14, 2010 8:30AM - 9:06AM |
G1.00001: Understanding the Top Quark Fifteen Years After Its Discovery Invited Speaker: The discovery of the top quark in 1995, by the D0 and CDF collaborations, was the culmination of nearly two decades of intense research at accelerators around the world. Since then, both collaborations have done precise measurements of the top quark properties, in particular its mass and production cross section. The top quark's large mass, by far the heaviest fundamental particle known, makes it a unique probe of physics at the natural electroweak scale. Precision measurements of the top mass, width and couplings may therefore lead to a deeper understanding of electroweak symmetry breaking and the origin of mass. Such measurements are possible in part because the top quark's natural width of 1.4GeV is much greater than the hadronization timescale set by $\Lambda _{QCD}$, causing the top quark to decay to a real W boson and a bottom quark before hadronization. The top quark can therefore be completely described by perturbative QCD, and studied as a bare quark. Precision studies of this unconventional quark are considered high priorities at hadron collider machines (Tevatron and LHC) and studies for future accelerators, and are unanimously accepted as a worldwide scientific priority. In this talk I will summarize our current understanding of the properties of this intriguing particle, present the latest results from the Tevatron experiments, and review the prospects of the future top quark physics program both at the Tevatron and the LHC. [Preview Abstract] |
Sunday, February 14, 2010 9:06AM - 9:42AM |
G1.00002: The Standard Model : Low Energy Measurements Invited Speaker: The Standard Model (SM) of particle physics, while supported by an extraordinary amount of experimental evidence, is incomplete. Understanding the physics that lies beyond the SM requires a new generation of experiments, operating at the frontiers of energy, intensity, sensitivity, and precision. At the frontiers of energy, the Large Hadron Collider will conduct direct searches for new particles. These same particles may also reveal themselves in radiative corrections to phenomena accessible at low energy. For instance, the g-factor of the muon deviates from 2 because of radiative corrections. New physics, with new particles, will contribute to g-2 and perturb its value from that expected from SM particles alone. A new experiment at Fermilab proposes a measurement of the muon g-2 to an unprecedented 140 ppb, sensitive to many new models of physics beyond the SM. Also at Fermilab, the new Mu2e experiment will search for muon to electron conversion, a process violating charged lepton flavor. The anticipated sensitivity for the conversion signal exceeds that predicted in some supersymmetric models by more than an order of magnitude, and exceeds that of its predecessors by almost 4 orders of magnitude. The symmetries of the SM can also be tested by searching for electric dipole moments (EDMs) of fundamental particles. EDMs violate time-reversal symmetry and CP, and are predicted in the SM, but at a level far below any planned experiment. However, many theories of physics beyond the SM predict new particles and new sources of CP violation. These lead to dramatically enhanced EDMs, within the reach of a new generation of experiments promising orders of magnitude improvement in sensitivity to EDMs in electrons, neutrons, protons, deuterons, and nuclei. These new low energy measurements will be described, with their prospects for ushering in a new era of physics beyond the Standard Model. [Preview Abstract] |
Sunday, February 14, 2010 9:42AM - 10:18AM |
G1.00003: Electroweak Physics at the Tevatron and LHC Invited Speaker: Collider measurements of electroweak phenomena serve numerous purposes: electroweak quantities can be used to test the standard model via global fits, serve to provide information about other areas such as Higgs physics and QCD, and help calibrate detectors through the measurement of precisely known electroweak values. At the Tevatron, years of data analysis by the CDF and D0 experiments have yielded numerous important electroweak measurements whose techniques and impact will be discussed. These include the world's best W mass measurements, information on PDFs via measurements of Z rapidity and forward-backward charge asymmetry of the W decay, limits on anomalous triple gauge coupling quantities, and discoveries of diboson production in various decay channels. At the LHC, a crucial purpose of electroweak measurements, particularly during its early running, will be as a tool to better understand the energy scales and efficiencies of the LHC detectors. In the long term, while some electroweak measurements at the LHC are expected to improve on those at the Tevatron simply due to higher statistics, others will only be able to improve on the Tevatron measurements by a thorough understanding of the detector's systematics. Systematically limited electroweak measurements at the LHC will benefit from calibration measurements in this regard, and their prospects will be discussed. [Preview Abstract] |
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