Fermilab TodayThursday, April 22, 2004  
DASTOW and Earth Day Today!
The DASTOW information table is located in the atrium of Wilson Hall. If you plan to participate in the Earth Day activities, don't forget to bring a pair of boots. We hope everyone has a fun and safe day!
Schedule of events

Thursday, April 22
2:30 p.m. Theoretical Physics Seminar - Curia II
Speaker: A. Mitov, University of Hawaii
Title: Perturbative Heavy Quark Fragmentation Function at NNLO
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over

Friday, April 23
3:30 p.m. DIRECTOR'S COFFEE BREAK - 2nd Flr X-Over
4:00 p.m. Joint Experimental Theoretical Physics Seminar - 1 West
Speaker: J. Collar, University of Chicago
Title: Review of Axion Searches
8:00 p.m. Fermilab Lecture Series - Auditorium
Speaker: Dr. Barry Barish
Title: Einstein's Unfinished Symphony: Sounds from the Distant Universe

Wilson Hall Cafe Grand Opening
Thursday, April 22
Southwestern Chicken Tortilla
Philly Style Cheese Steak $4.75
Baked Fish with Roasted Leeks and Peppers $3.75
Tomato Basil Chicken Parmesan $3.75
Classic Cuban Panini $4.75
Cheesy Breadsticks $1.85
Marinated Grilled Chicken Caesar Salads $4.75
Today's Special: Free Samples from Kellogg's

Wilson Hall Cafe Menu
Chez Leon
Weather Breezy 55º/39º

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Historic Prairie Schooner Arrives at Fermilab
Prairie Schooner and Education Staff
Tennessee and Kimberly Stewart (left) with docents and staff from the Education Office. (Click on image for larger version.)
Friday, April 16, a prairie schooner from the turn of the 20th century arrived at the Lederman Science Center. The education office purchased the canvas-topped wagon from "Tennessee" John Stewart, who, along with his wife Kimberly, brought the wagon by truck from Cookeville, Tennessee.

"This has been a dream of ours for years," said Priscilla Meldrim from the Education Office. "We started searching the Internet last spring, found Tennessee Stewart's Web site, and now we have an authentic prairie schooner to use for student programs."

The schooner will be a feature of the "From Beneath the Ashes" field trip for grades 3-5. In the classroom unit, students learn about the prairie as they study Illinois history, read pioneers' letters and read a book about a young girl who moves to the Dakota Territory. About 4,000 students of this program visit Fermilab every year to experience the prairie firsthand. Beginning April 30, docents will use the schooner to illustrate what a pioneer family's trip across the prairie was really like.

The education office welcomes employees and their families to view the schooner, located next to the Science Center, but asks that visitors please do not climb on it.

Accelerator Update
April 19 - April 21
- During this period of time Operations established two stores that provided approximately 27 hours and 30 minutes of luminosity to the experiments.
- The TeV suffers a quench on a proton abort.
- A power glitch tripped off some devices but doesn't bother the stack or store.
- Tornado warnings drive operators to basement.

View the current accelerator update
View the Tevatron Luminosity Charts

In the News
From Wired News, April 19, 2004:
Neutrino Miners Get Down, Dirty
By Michelle Delio
Thousands of feet below the Earth's surface, scientists around the world are happily engaged in studying the birth of our universe and its possible destruction.

To properly study neutrinos -- those perky, almost invisible particles carrying messages from deep outer space -- to fully explore the cosmic mystery glue known as dark matter, to verify whether some rogue nation is furtively developing nuclear weapons and testing them deep underground, and to develop computer chips that don't contain flaws caused by subatomic particles, scientists need to work in deep burrows beneath the Earth's surface. They need to be far away from the bombardment of cosmic rays and seismic noise that interferes with delicate experiments.
read more

Fermilab Result of the Week
New World Average for the Top Quark Mass
CDF and DZero
Comparison of the measurements of the top-quark mass and their average. (Click on image for larger version.)
The top quark is the most massive fundamental particle known today. Discovered less than 10 years ago by the CDF and DZero experiments during Tevatron's Run I (1992-1996), its mass was measured in all possible decay modes. For better precision the results of the two experiments can be combined. This was done in 1999 resulting in a world average top mass of 174.3+-5.1 GeV.

Since then, the DZero collaboration performed a very precise mass measurement in the lepton+jets channel based on Run I data, exploiting a new analysis technique. When the DZero and CDF Run I results are combined once again, the new world average is 178.0+-4.3 GeV. The above figure shows a comparison of all results. This combination extends the fruitful collaboration of CDF and DZero within the Tevatron electroweak working group from W/Z physics to top physics.

Some properties of the electroweak interaction depend strongly on the top-quark mass and weakly on the mass of the Higgs boson: the all-important particle in the Standard Model which has yet to be observed. With the increase in measured top-quark mass, the predicted upper limit on the mass of the Standard Model Higgs boson increases by 32 GeV to 251 GeV. This extends the mass range that should be covered in the direct Higgs boson searches, such as those of CDF and DZero.

Result of the Week Result of the Week
Members of the Tevatron Electroweak Working Group, Emanuela Barberis (left), Northeastern University, and Martin Grunewald (right), University College Dublin, collaborated on the top-mass combination.

Result of the Week Archive

Spring Fling Book Fair - April 21 & 22
Fermilab's Recreation Office will sponsor its "Spring Fling" Book Fair, hosted by Books are Fun, in the Atrium on Wednesday, April 21 from 10:00 a.m. until 6:00 p.m. and on Thursday, April 22 from 7:00 a.m. until 3:00 p.m.

New Book Purchase Suggestions
New Book purchase suggestion lists for the week of April 20 are now available. These include Majors book lists in four subject areas. There is also an Amazon suggestion list in the form of a shopping cart, viewable by entering the password "library."

Reminder: 2004 Tollestrup Award Deadline
The nomination material for the 2004 Tollestrup Award for Outstanding Postdoctoral Research is due at the Users' Office on April 30. All material must be on paper: no email submissions will be considered. For complete details please review the award announcement online.

Fermilab Lecture Series
Dr. Barry C. Barish, Professor of Physics at Caltech and Director of the LIGO Laboratory, will present Einstein's Unfinished Symphony: Sounds from the Distant Universe on April 23, 2004 at 8 p.m. in Ramsey Auditorium. Tickets are $5.
more information

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