Fermilab TodayThursday, March 4, 2004  
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Thursday, March 4
2:30 p.m. Theoretical Physics Seminar - Curia II
Speaker: N. Glover, University of Durham
Title: Jet Cross Sections at NNLO
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
THERE WILL BE NO ACCELERATOR PHYSICS AND TECHNOLOGY SEMINAR TODAY

Friday, March 5
3:30 p.m. Wine & Cheese - 2nd Flr X-Over
4:00 p.m. Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: A. Para, Fermilab
Title: Liquid Argon TPC for NuMI Off Axis and Proton Decay Experiment

Cafeteria
Thursday, March 4
Old Fashioned Tomato soup
Baked pork chop w/Granny Smith apple salsa and choice of vegetable $3.50
Baked tilapia Florentine w/rice and choice of vegetable $3.50
Assorted gourmet sandwiches and panini $4.75
Double bacon cheese burger w/soup or fries $4.75
Rustic chicken salad over wild greens w/fresh fruit $3.75

Eurest Dining Center Weekly Menu
Chez Leon
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So Long, Shirley Knauf
On Friday, Shirley Knauf retired from the Computing Division. She worked at data entry, procard ordering, and expediting (sending broken parts for replacement). Knauf spent 12 years at Fermilab, longer than any previous job. "I dealt with people throughout the lab," she said, "and it was very interesting."

Knauf, who grew up in Oswego, now lives in Yorkville. Most of her family lives in the area, including all 12 grandchildren. In addition to spending more time with her family, Knauf looks forward to travel and volunteer work with her husband, and maybe golf lessons. But as for her friends at Fermilab, "I will definitely miss them," she said.

Shirley Knauf worked in the Computing Division for twelve years.
Fermilab Winter Basketball League Championship Game Tonight
The championship game of the Fermilab Winter Basketball League will be played tonight at 5:15 p.m. at the Village gym. The Purple People Eaters, led by Mike Michalak of FESS, will battle the Black Bulls, led by Dan Eddy of the Technical Division. A rivalry as strong and enduring as the Packers v. Bears or the Cardinals v. Cubs, these two teams have battled for the championship four of the last five years. Come watch and enjoy what is sure to be an exciting game.

Accelerator Update
March 1 - March 3
- During the last forty-eight hours, Operations established one store. That store along with one that already existed provided approximately 23 hours and 40 minutes of luminosity to the experiments.
- The TeV quenched early Tuesday morning while ramping up for a store.

View the current accelerator update
View the Tevatron Luminosity Charts

In the News
From the AIP Bulletin of Physics News, March 3, 2004
The Accelerating Expansion
The accelerating expansion of the universe, the notion that the big bang enlargement of spacetime is not slowing down but actually gathering speed, has received new experimental support in the form of supernova observations made by the Hubble Space Telescope (HST).

Previous evidence for such a cosmic acceleration consisted of studies of the dimness of remote supernovas (Update 355), and represented a major revision for some scientists who had long thought that the mutual gravity among galaxies would slow or even reverse the cosmological expansion. The new HST observations consist of reexaminations of 170 previously studied supernovas and the announcement of 16 new objects, including 6 of the 7 most distant type Ia supernovas yet recorded.
read more

From Ohio State Research, March 1, 2004
Information Paradoz Solved? If So, Black Holes are "Fuzzballs"
COLUMBUS, Ohio Stephen Hawking and Kip Thorne may owe John Preskill a set of encyclopedias.

In 1997, the three cosmologists made a famous bet as to whether information that enters a black hole ceases to exist -- that is, whether the interior of a black hole is changed at all by the characteristics of particles that enter it.
read more

Fermilab Result of the Week
Gone in Thirty Picoseconds
Dzero Result of the Week
The figure shows the tracks emanating from a proton anti-proton collision. While most of the tracks come from a central beam collision point, two sets, identified by the b-tagging algorithm, originate from locations (circled) displaced from that central point. (Click on image for larger version.)
The Run II DZero detector has a marvelous new capability: the ability to identify the decay of b-quarks. When a quark is created in high-energy collisions at the Tevatron, it interacts with other quarks to form a directed spray of hadrons or a "jet" that emerges from the collision. Jets are extremely common at the collider and found in nearly every energetic collision.

It is difficult to tell which kind of quark or gluon gave rise to a jet; however, jets that originate from a heavy b-quark have a unique feature that can identify their origin. Particles containing the b quark can live long enough to escape the fireball of the collision. By providing precision measurements along the trajectory of these long-lived particles, DZero's new silicon microstrip tracker can identify these b-quarks.

Finding the b-quarks without getting fooled by false positives is no small feat. The group of people shown in the picture has been working for two years to develop four different b-tagging algorithms. Currently Meenakshi Narain of Boston University and Gordon Watts of the University of Washington lead the group.

Why do we want to pick out b-quark jets from the data? In addition to being intrinsically interesting, many extremely interesting signals involve the b-quark. Identifying b-quarks can help us identify the familiar top quark, the Higgs boson, and even more speculative particles predicted by non-standard models. There's a great deal of interesting physics in events containing b-quarks, which is why DZero is going to great lengths to find them.

DZero Result of the Week
DZero b-tagger team members: (left to right) Lorenzo Feligioni, Alexander Kanov, Flera Rizatdinova, Sebastien Greder, Phillip Shieferdecker, Benoit Clement, Kazu Hanagaki, Ariel Schwartzmann (Click on image for larger version.)
Result of the Week Archive

Announcements
Omega World Travel Meeting Today
Today the Travel Office and Omega World Travel will host a meeting to introduce new web tools for planning and tracking Fermilab business travel. Employees who travel or arrange travel are invited to attend. The meeting will be held in Wilson Hall, 1-West from 10:00 a.m. to 11:30 a.m.

Kautz Road Construction Gate Closing
As of March 5, the construction gate at Kautz Road will be closing indefinitely.

Fermilab Arts Series
The Fermilab Arts Series presents a Choreographer's Showcase on March 13 at 8:00 p.m. Tickets are $18.00 for adults and $9.00 for ages 18 and under.
more information

Fermilab Lecture Series
On March 26 at 8:00 p.m., Dr. Bennet Bronson of the Field Museum will present, "The Last Golden Age of Imperial China: The Emperor, The Economy, and The Arts in the 18th Century." Tickets are $5.00.
more information

Fermilab Association of Rocketry
The Fermilab Association of Rocketry (FAR) is having its first monthly club launch of 2004 (weather permitting) on March 6, 2004 from noon until 4:00 p.m.
more information

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