Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session H4: Tevatron Collider Results |
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Sponsoring Units: DPF Chair: Cecilia Gerber, University of Illinois at Chicago Room: Hyatt Regency Jacksonville Riverfront Grand 3 |
Sunday, April 15, 2007 8:30AM - 9:06AM |
H4.00001: Recent Measurements of the Top Quark from Fermilab Invited Speaker: The top quark was discovered in 1995 at Fermilab by both the CDF and D0 experiments. At that time, called Run I, both experiments measured various properties of the top quark, namely its production cross section and mass, but these results were limited by statistics. During the late 1990's the Fermilab accelerator and the collider experiments underwent extensive upgrades. Since 2002, when Run II started, Fermilab has collected 20 times more data than Run I. The larger data samples and increased collision energy of Run II have allowed CDF and D0 to move into the realm of precision measurements of the top quark. The latest results from studies of the top quark at both experiments will be presented. These will include precision measurements of the top quark mass and its cross section plus other properties such as its charge and lifetime. In addition CDF and D0 have studied top quark production and decay properties looking for deviations from the Standard Model and possible hints to new physics. Most of these results involve the pair production of top quarks through the strong interaction. The Standard Model also predicts that top quarks should be produced singly through an electroweak interaction but with a smaller cross section than pair production. Until recently both experiments have only been able to place limits on single top quark production. The latest results with evidence for single top quark production will also be shown. [Preview Abstract] |
Sunday, April 15, 2007 9:06AM - 9:42AM |
H4.00002: Electroweak physics and Higgs Searches at the Tevatron Collider Invited Speaker: With the availability of an inverse femtobarn data set and improved analysis techniques, the Tevatron collider experiments have extended the exploration of the electroweak sector to higher precision measurements and the smallest cross sections detected at a hadron collider. Likewise, searches for the Standard Model Higgs have achieved significantly greater sensitivity. A new and the single most precise measurement of the W-boson mass has decreased the most likely mass of the Higgs. Tevatron measurements have now nearly completed the suite of boson and di-boson production cross sections and show evidence for electroweak single top production. As probes of the Standard Model these cross sections are interesting in their own right, however, they are also important background process in the search for the Higgs. A review of the new W-boson mass and results in boson, di-boson and single top production will be presented. The status of indirect measurements of the Higgs mass as well as direct searches for the Higgs will be discussed. These Higgs search results will be highlighted by presentation of the most recent combined Tevatron limits. [Preview Abstract] |
Sunday, April 15, 2007 9:42AM - 10:18AM |
H4.00003: Looking for new physics at the Tevatron collider Invited Speaker: The standard model describes the experimental data on particle interactions very well. However in order to avoid theoretical problems with the model, it is expected that some new physics has to appear at energy scales of a few TeV. The Tevatron collider at Fermilab currently probes elementary particle physics at the highest energies and it is therefore the most powerful instrument to search for this new physics. The Tevatron experiments now have recorded data samples that are measured in inverse femtobarns. I will review their results of searches for a range of possible signals such as heavy gauge bosons, non-standard Higgs bosons, supersymmetric particles, leptoquarks, and effects of extra dimensions. [Preview Abstract] |
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