 | Thursday, June 8, 2006 |
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Thursday, June 8
Friday, June 9
Saturday, June 10 Click here for a full calendar with links to additional information. |
 Mostly Sunny 85º/55º
Extended Forecast |
Secon Level 3 |
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Thursday, June 8 -Tomato Florentine -Grilled Chicken Cordon Bleu Sandwich -Chimichangas -Chicken Marsala -Smoked Turkey Melt -Assorted Pizza -SW Chicken Salad with Roasted Corn Salsa |
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Thursday, June 8
Wednesday, June 14
Chez Leon Menu |
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Alvy Singer: Well, the universe is everything, and if it's expanding someday it will break apart, and that will be the end of everything.
Alvy's mother: Why is that your business? This conversation between Alvy Singer and his mother, from the movie Annie Hall, greeted summer students and interns as Fermilab Director Pier Oddone kicked off Tuesday's lunch time lecture. Alvy may be a neurotic kid, but at Fermilab the universe really is our business. Oddone continued with a summary of what particle physics has learned to date: the six quarks and six leptons, their anti-particle counterparts, and the existence of the elusive entities, dark matter and energy. He described the mysteries that loom at the horizon, including Supersymmetry and the super partners it predicts. Oddone also explained some of the ongoing and future efforts, including the Tevatron, LHC, ILC, MINOS and CDMS, which may answer some of these questions. "We are always battling the unknown," he said. "We are always on the edge of what we know and what we don't."
The director explained that through time scientists have often found simple explanations for complex phenomena, noting that all the elements in the periodic table can be explained by just a few elementary particles and force carriers. The myriad of elements and forces that come together almost miraculously in the universe may have even simpler explanations as scientists venture farther up the energy scale. Oddone drew the following analogy to explain the apparent contradiction between complexity and simplicity, "If you look at snow flakes they have an enormous richness and variety. [But] at some temperature, that enormous richness.is actually a simple water molecule."
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Biomedical Research Feels
the BIRN
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The Biomedical Informatics Research Network is pioneering the use of advanced cyberinfrastructure for biomedical research, starting with the mysteries of the human and animal brain.
The BIRN's main goal is to get biomedical scientists collaborating like never before. Starting with four projects, or test beds, the BIRN is discovering which information technologies are wanted and needed by-and useful for-the biomedical community. The technologies help researchers share ideas, software and data; access high-performance computing resources; and deal with the explosion of data from new research techniques.
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MSNBC online, June 5, 2006: Physicists probe the fifth dimension SEATTLE - The cosmos would make perfect sense . if it turns out we're living in a 10- or 11-dimensional realm where gravity is bubbling off a different plane entirely. At least that's what's emerging as the hottest concept on the frontier of physics.
Though these sound like virtually unverifiable claims, physicists are trying to come up with ways to gather evidence to back up or disprove the extradimensional theories currently in vogue. But it'll take several years to get that evidence, if it can be gotten at all.
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| DZero homes in on the Higgs | |||
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Throughout the years, particle physicists have developed a theoretical
framework describing our understanding of the fundamental particles and
forces of nature, called the Standard Model (SM). One of the ingredients
in the SM is a hypothetical particle, the Higgs boson, which through
quantum interactions with all other particles explains particle mass. The Higgs remains unobserved, but experimental and theoretical arguments
point to a Higgs mass in the range of 114 GeV/c2 to approximately
200 GeV/c2 (the proton's mass is roughly 1 GeV/c2), hence it could be found
at the Tevatron.
If the Higgs mass is in the range 135-200 GeV/c2, the SM predicts it will most frequently decay to two W bosons. Recently, the DZero experiment has used one inverse femtobarn of Tevatron Run II data to search for a Higgs boson in this decay mode. To distinguish this experimental signature from the many background processes, only leptonic decays of the W bosons are selected (WW->eνeν, eνμν). Currently, this search has found no evidence of the Higgs boson. This null result allows DZero to set new exclusion limits on the SM Higgs boson production cross section times branching ratio, sigma x BR(H->WW*), using the combination of the eνeν and eνμν final states. The sensitivity of the result is within a factor of 6-7 of the SM cross section at masses near 160 GeV/c2. This result demonstrates that the Tevatron is on track to probe SM Higgs models and is beginning to exclude particle models which assume the existance of a fourth family of quarks. This limit will be further improved as Run II continues, and if the SM Higgs mass is about twice the W boson mass (160 GeV/c2), we could see evidence of it with the full expected luminosity in Run II. | |||
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| Result of the Week Archive
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June 6 - 7 - TeV loads 12x0 study store - Pbar stacks antiprotons - D0 begins two shift access - Recycler stashed antiprotons - Klystron Debuncher trips - Machine Reports
Read the Current Accelerator Update
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DASTOW set for June 22
One West closed for remodeling
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