 | Thursday, June 1, 2006 |
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Thursday, June 1
Friday, June 2
Saturday, June 3 For links to events, click here. |
 Showers/T-Storms Likely 79º/59º
Extended Forecast |
Secon Level 3 |
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Thursday, June 1 -Beef Pepper Pot -Buffalo Chicken Wings -Cajun Breaded Catfish -Sweet & Sour Pork over Rice -Honey Mustard Ham & Swiss Panini -Double Stuffed Pizza -Carved Turkey |
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Thursday, June 1
Chez Leon Menu |
| Fermilab Today is online at: http://www.fnal.gov/today/ Send comments and suggestions to today@fnal.gov Fermilab Today archive Hurricane Relief Page Fermilab Today PDF Version Fermilab Result of the Week archive Fermilab Safety Tip of the Week archive Linear Collider News archive Fermilab Today classifieds Subscribe/Unsubscribe to |
| EPP2010 Chair Harold Shapiro speaks at 8:45 a.m. |
Don't miss Harold Shapiro, chair of the EPP2010 committee, when he gives the first talk of today's Users' Meeting in Ramsey Auditorium at 8:45 a.m.
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Congresswoman Judy Biggert of Illinois (13th CD) had her Ramsey Auditorium audience primed and ready when she declared she had good news to deliver as the Monday morning keynoter for the Annual Users' Meeting. And good news it was: the House of Representatives passed the Energy and Water Appropriations bill last week with $535 million in funding for the Department of Energy's Office of Science -- $35 million more than the original budget request by President Bush.
"Fermilab is the current home of the energy frontier," Rep. Biggert said to warm applause, "and you should get the resources you need to maintain Illinois at the energy frontier." Rep. Biggert cautioned that the budget process is not complete, with the bill now headed to the Senate. She said the increase in Office of Science funding could offer a target for reductions in the Senate. "We've got to be very vigilant so that doesn't happen," she said. "We're not yet at the finish line, so we must keep our eyes on the prize." While her arrival had been delayed several minutes by traffic congestion due to an auto accident on Farnsworth Road, Rep. Biggert declared: "It's great to be anywhere but in Washington today." A member of the House Science Committee, Rep. Biggert chairs the Energy and Water Subcommittee with
Rep. Biggert, whose district includes Argonne National Laboratory, was steadfast on two issues affecting the future of Fermilab and US high energy physics: she views basic research, especially in the physical sciences, as a critical component of the American Competitiveness Initiative; and she hopes to see the International Linear Collider "built right here in Illinois."
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SURA Brings Grids to Southeastern United States
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SURAgrid, the cyberinfrastructure initiative of the Southern Universities Research Association, has received authorization for $1 million over the next three years from the SURA Board of Trustees to expand its resources and staff and to develop new grid communities across the Southeastern United States. Read More |
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Houston Chronicle, May 24, 2006: A bleak future for particle physics? I have a soft spot in my heart for particle physics -- I spent a summer at Fermi National Accelerator Laboratory in 1996, the world's most powerful particle accelerator. (It loses the title next year, when the Large Hadron Collider opens for business in Europe.) The last 100 years were undoubtedly the century of physics, and the particle physicists were kings as they unlocked the secrets of the atom and harnessed its powers.
But since then their work has ever become more esoteric, to the public at least, as they probed quarks, leptons and a host of unknowable particles. I believe the general public has a hard enough time distinguishing between protons and neutrons, let alone charm quarks and W bosons. And who can blame them? These particles are more the constructs of mathematical equations than something one can hold in his or her hand.
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| Tough Top: Nothing but Jet | ||
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Top-antitop pairs produced at the Tevatron will produce six quarks
(including two b quarks) in the final state of their decay chain 45%
of the time. These quarks manifest themselves in the detector as
sprays of particles called jets. Although these so-called "all-jets"
events represent a considerable chunk of data, measuring the mass of
these top quarks is no easy feat. The main reasons are the large amount
of QCD background which produces six or more jets and the complication
of combining the jets to form two top quarks. Only one out of 90
independent jet combinations corresponds to the true top-antitop
decay. The advantage of top measurements with all-jets events is
that none of the decay products are lost in the form of neutrinos,
elusive particles which carry a major component of the top quark
momenta in other types of top-antitop decays. Therefore, both the top
and antitop quark can be completely reconstructed in the same event.
CDF physicists have recently measured the top quark mass in this difficult environment by adapting a technique originally developed in the DELPHI experiment at LEP. The technique creates a weight for each of the 90 possible top-antitop combinations according to the likelihood that the kinematics are consistent with top-antitop events and that two of the jets result from b quark decays. In this way, correctly combined top-antitop events are distinguished from background events and wrong combinations. By measuring simultaneously the signal-to-background ratio and the top mass, the CDF measurement determines the QCD background directly from the data. Having analyzed roughly one third of the total available data, 310 pb-1, the CDF measurement yields an already remarkable precision: Mt = 177.1 +- 4.9 (stat) +- 4.7 (syst) GeV. Without improvements to the method the statistical uncertainties using 1 fb-1 of data are expected to reduce to about 2 GeV, which is competitive with the best measurements to date. When combined with other channels the ultimate top mass precision will be improved, and the predictions of the Standard Model will be further tested. | ||
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| Result of the Week Archive
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May 30 - 31 - Startup - F4 wet engine broke connecting rod - Cross Gallery attacked - D0 powered solenoid and magnets - Machine Reports Read the Current Accelerator Update Read the Early Bird Report View the Tevatron Luminosity Charts
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Fermi Singers will perform June 2
One West to close for remodeling
Federal Citizen Information Center
Recreation Ticket Service Charge
English country dancing |
