 | Thursday, April 21, 2005 |
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Thursday, April 21 2:30 p.m. Theoretical Physics Seminar - Curia II Speaker: J. Andersen, University of Cambridge Title: Probing the High Energy Limit of QCD 3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY SEMINAR TODAY
Friday, April 22 |
 Partly Cloudy 62º/43º
Extended Forecast |
Secon Level 3 |
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Thursday, April 21 Southwestern Chicken Tortilla Soup Philly Style Cheese Steak $4.75 Baked Fish w. Roasted Leeks and Peppers $3.75 Tomato Basil Chicken Parmesan $3.75 Classic Cuban Panini $4.75 Four-Cheese Pizza $2.75 Marinated Grilled Chicken Caesar Salads $4.75 The Wilson Hall Cafe now accepts Visa, Master Card, Discover and American Express at Cash Register #1.
Wilson Hall Cafe Menu |
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UEC, SLUO Trek to DC for
Annual Meetings on Hill
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Last month, thirty members of Fermilab's Users Executive Committee and SLAC's
Users' Organization spent March 16 and March 17 meeting with the offices of
more than 125 Senators and Representatives in Washington D.C.
UEC and SLUO travel to the capitol with an annual mission. This year, it was clear-cut: how to improve funding for research in the physical sciences. "When you ask for an increase in funding, you often times get the feeling that there is support but no commitment," said UEC member Erik Gottschalk, who organized the trip to D.C. "This year, we referred to the APS Innovations Report and that really seemed to resonate with people."
As a direct outcome of this year's visit, the UEC and SLUO members managed to
get a "Dear Colleague" letter started in the House of Representatives. The
letter was initiated after discussions between a member of SLUO and
Representative Adam Schiff (D-CA) and a representative of the UEC and
Congresswoman Judy Biggert (R-IL) in a bipartisan effort. "The letter
really was a direct result of what happened during our meetings in D.C.,"
said Gottschalk. The combined users' group also spent March 18
meeting with the Office of Management and Budget (OMB), the Office of
Science and Technology Policy (OSTP), the National Science Foundation,
and the Department of Energy. For more information about the trip,
contact members of the UEC.
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BS's Sharon Larson Retired
After 24 Years at Fermilab Sharon Larson, an Administrative Support Assistant in BS, retired last Tuesday, April 12. She worked at the lab for over 24 years,
- Eric Bland |
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April 18 - April 20 - During this 48 hour period operations established on store that combined with an existing store provided the experiments with approximately 37 hours and 47 minutes of luminosity - Main Injector suffers from RF cavity phase error - Accumulator power supply (A:LQ) causes problems - Accumulator Septa power supply causes problems
Read the Current Accelerator Update |
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From Innovations Report, April 19, 2005 Reno professor showcases ’mini’ ion accelerator Tom Cowan’s team is thinking smaller, but with big impact. Particle accelerators are a key research tool in a high energy physicist’s arsenal, but they take up a lot of space – miles and miles of it. But at the University of Nevada, Reno, smaller is better.
Cowan, director of the Nevada Terawatt Facility at the University, and his research partners have produced a proton beam that has 100 times higher quality than any conventional particle accelerator and fits on a tabletop.
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CDF Tops the Top World Average | ||
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The top quark is a most remarkable particle, even for a quark.
It was discovered by the CDF and DZero collaborations in 1995 with
a surprisingly large mass — almost 35 times larger than the mass of the
bottom quark. In fact, a single top quark weighs about as
much as an atom of gold. In spite of its great mass and exceedingly
brief existence in our detectors, top quark properties,
particularly its mass, are extremely important for our
understanding of nature.
The top quark mass serves as a fundamental parameter in the Standard Model (SM). Precise knowledge of the top mass provides us with constraints on the mass of what may be the last undiscovered SM particle, the Higgs boson. A very precise measurement, with other precision data, allow us to test other theories that are SM extensions. A team of researchers from CDF has now completed a new measurement of the top quark mass using pair-produced top events where each massive quark decays into a bottom quark and W boson. They select events in which one W decays to a lepton and a neutrino and the other W decays to two quarks, or "jets" — so-called "lepton plus jets" decay states of the top quark. The top quark mass and hadronic W boson mass distributions reconstructed in data for double b-tag, one b-tag, and no b-tag samples are compared to the Monte Carlo templates in order to extract the top mass, shown in the above figure. The hadronic W boson mass distribution is used as an addtional calibration for the calorimeter energy response to jets in the CDF detector, thereby reducing the single largest source of systematic uncertainty in the measurement. These strategies result in the world's most precise measurement of the top quark mass: Mtop = 173.5 +2.7/-2.6 (stat) +/- 3.0 (syst) GeV/c2. One of the beauties of the measurement is that the statistical and systematic uncertainties will continue to shrink as more data is collected. | ||
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Result of the Week Archive |
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Earth Day is Tomorrow Tree Planting Begins at 11:30 a.m. Fermilab's Earth Day tree-planting activities for employees and their families, sponsored by Roads and Grounds, will be held on Friday, April 22 with a rain date of Monday, April 25. Because there is a strong chance of rain on Friday, employees should call x3303 tomorrow morning to find out if the tree-planting event has been moved to Monday. The planting will start at 11:30 a.m. and will go until all of the trees are planted. Bring a shovel, and wear boots and gloves (and this year, bring your own lunch, too). The area to be planted this year is directly west of Warehouse II. more information
Summer Leagues
Fermi Singers Perform this Friday
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