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
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
4:00 p.m. Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: Y. Kolomensky, University of California, Berkeley
Title: E158 Results on Parity Violation in Electron-Electron
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
is now open. Call x4512 to make your
UEC, SLUO Trek to DC for
Annual Meetings on Hill
Erik Gottschalk (left) and Herman White (right) met with Congresswoman Judy Biggert (R-IL)
in Washington D.C. (Click on image for larger version.)|
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.
- Elizabeth Clements
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,
beginning March 16, 1981. "I will miss all my fellow employees and the many great friends I have made over the years," said Larson. During her retirement she will spend more time with the love of her life, mentor and best friend, her husband Tom, who retired from the Accelerator Division in April 2000. Sharon and Tom have many household projects and repairs to accomplish, plan to spend more time with their 14 indoor cats, and will go on walks for exercise and enjoyment. She is also looking forward to spending some quality time with her grandchildren, Amanda, 12, and Alex, 9, in DeKalb, Illinois. And while she might be retired, don't be surprised to see her in Fermilab's halls. "I'll still be around," said Larson.
- Eric Bland
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.
CDF Tops the Top World Average|
Reconstructed top quark mass of four subsamples of the CDF lepton+jets
having different numbers of b-tags and jet Et thresholds. The Monte Carlo signal and background mass shapes corresponding
to the most probable top quark mass are overlaid on the histograms.(Click on image for larger version.)|
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
uncertainties will continue to shrink as more data is collected.
From top to bottom, left to right: Pekka Sinervo, Jean-Francois
Arguin (U. of Toronto), Mel Shochet, Jahred Adelman, Erik Brubaker (U. of
Chicago), Giorgio Belletini (INFN Pisa), Shinhong Kim, Tomonobu Tamura (U.
of Tsukuba), Julian Budagov (JINR), Koji Sato (U. of Tsukuba), Young-Jang
Lee (KCHEP), Wojtech Fedorko (U. of Chicago), Guram Chlachidze (JINR),
Un-Ki Yang, Young-Kee Kim (U. of Chicago), G. Velev (Fermilab).
(Click on image for larger version.)|
Result of the Week Archive
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.
Co-Ed Softball League
The co-ed softball league will begin play on May 18. There will be
a captains meeting on April 27 at noon in the cafeteria. Players of
all levels welcome. Contact Dave Hockin, the league representative at
for more information or to find a team.
Co-Ed Summer Volleyball League
The Recreation Office is looking for a league representative
for the coed summer volleyball league. If you are interested contact
Jean at x2548 or firstname.lastname@example.org
Fermi Singers Perform this Friday
The Fermi Singers are back! Mark your calendars for
April 22 at noon in the Auditorium. The group will present a
Spring Concert for your listening pleasure. Snacks will be
available following the performance!